The SUSE Linux Enterprise 11 SP3 LTSS kernel was updated to receive various security and bugfixes. The following security bugs were fixed :

  - CVE-2016-3955: The usbip_recv_xbuff function in     drivers/usb/usbip/usbip_common.c in the Linux kernel     allowed remote attackers to cause a denial of service     (out-of-bounds write) or possibly have unspecified other     impact via a crafted length value in a USB/IP packet     (bnc#975945).

  - CVE-2016-4998: The IPT_SO_SET_REPLACE setsockopt     implementation in the netfilter subsystem in the Linux     kernel allowed local users to cause a denial of service     (out-of-bounds read) or possibly obtain sensitive     information from kernel heap memory by leveraging     in-container root access to provide a crafted offset     value that leads to crossing a ruleset blob boundary     (bnc#986365).

  - CVE-2015-7513: arch/x86/kvm/x86.c in the Linux kernel     did not reset the PIT counter values during state     restoration, which allowed guest OS users to cause a     denial of service (divide-by-zero error and host OS     crash) via a zero value, related to the     kvm_vm_ioctl_set_pit and kvm_vm_ioctl_set_pit2 functions     (bnc#960689).

  - CVE-2013-4312: The Linux kernel allowed local users to     bypass file-descriptor limits and cause a denial of     service (memory consumption) by sending each descriptor     over a UNIX socket before closing it, related to     net/unix/af_unix.c and net/unix/garbage.c (bnc#839104).

  - CVE-2016-4997: The compat IPT_SO_SET_REPLACE setsockopt     implementation in the netfilter subsystem in the Linux     kernel allowed local users to gain privileges or cause a     denial of service (memory corruption) by leveraging     in-container root access to provide a crafted offset     value that triggers an unintended decrement     (bnc#986362).

  - CVE-2016-5829: Multiple heap-based buffer overflows in     the hiddev_ioctl_usage function in     drivers/hid/usbhid/hiddev.c in the Linux kernel allow     local users to cause a denial of service or possibly     have unspecified other impact via a crafted (1)     HIDIOCGUSAGES or (2) HIDIOCSUSAGES ioctl call     (bnc#986572).

  - CVE-2016-4470: The key_reject_and_link function in     security/keys/key.c in the Linux kernel did not ensure     that a certain data structure was initialized, which     allowed local users to cause a denial of service (system     crash) via vectors involving a crafted keyctl request2     command (bnc#984755).

  - CVE-2016-5244: The rds_inc_info_copy function in     net/rds/recv.c in the Linux kernel did not initialize a     certain structure member, which allowed remote attackers     to obtain sensitive information from kernel stack memory     by reading an RDS message (bnc#983213).

  - CVE-2016-1583: The ecryptfs_privileged_open function in     fs/ecryptfs/kthread.c in the Linux kernel allowed local     users to gain privileges or cause a denial of service     (stack memory consumption) via vectors involving crafted     mmap calls for /proc pathnames, leading to recursive     pagefault handling (bnc#983143).

  - CVE-2016-4913: The get_rock_ridge_filename function in     fs/isofs/rock.c in the Linux kernel mishandled NM (aka     alternate name) entries containing \0 characters, which     allowed local users to obtain sensitive information from     kernel memory or possibly have unspecified other impact     via a crafted isofs filesystem (bnc#980725).

  - CVE-2016-4580: The x25_negotiate_facilities function in     net/x25/x25_facilities.c in the Linux kernel did not     properly initialize a certain data structure, which     allowed attackers to obtain sensitive information from     kernel stack memory via an X.25 Call Request     (bnc#981267).

  - CVE-2016-4805: Use-after-free vulnerability in     drivers/net/ppp/ppp_generic.c in the Linux kernel     allowed local users to cause a denial of service (memory     corruption and system crash, or spinlock) or possibly     have unspecified other impact by removing a network     namespace, related to the ppp_register_net_channel and     ppp_unregister_channel functions (bnc#980371).

  - CVE-2016-0758: Integer overflow in lib/asn1_decoder.c in     the Linux kernel allowed local users to gain privileges     via crafted ASN.1 data (bnc#979867).

  - CVE-2015-7833: The usbvision driver in the Linux kernel     allowed physically proximate attackers to cause a denial     of service (panic) via a nonzero bInterfaceNumber value     in a USB device descriptor (bnc#950998).

  - CVE-2016-2187: The gtco_probe function in     drivers/input/tablet/gtco.c in the Linux kernel allowed     physically proximate attackers to cause a denial of     service (NULL pointer dereference and system crash) via     a crafted endpoints value in a USB device descriptor     (bnc#971944).

  - CVE-2016-4482: The proc_connectinfo function in     drivers/usb/core/devio.c in the Linux kernel did not     initialize a certain data structure, which allowed local     users to obtain sensitive information from kernel stack     memory via a crafted USBDEVFS_CONNECTINFO ioctl call     (bnc#978401).

  - CVE-2016-4565: The InfiniBand (aka IB) stack in the     Linux kernel incorrectly relies on the write system     call, which allowed local users to cause a denial of     service (kernel memory write operation) or possibly have     unspecified other impact via a uAPI interface     (bnc#979548).

  - CVE-2016-2053: The asn1_ber_decoder function in     lib/asn1_decoder.c in the Linux kernel allowed attackers     to cause a denial of service (panic) via an ASN.1 BER     file that lacks a public key, leading to mishandling by     the public_key_verify_signature function in     crypto/asymmetric_keys/public_key.c (bnc#963762).

  - CVE-2016-4485: The llc_cmsg_rcv function in     net/llc/af_llc.c in the Linux kernel did not initialize     a certain data structure, which allowed attackers to     obtain sensitive information from kernel stack memory by     reading a message (bnc#978821).

  - CVE-2016-4578: sound/core/timer.c in the Linux kernel     did not initialize certain r1 data structures, which     allowed local users to obtain sensitive information from     kernel stack memory via crafted use of the ALSA timer     interface, related to the (1) snd_timer_user_ccallback     and (2) snd_timer_user_tinterrupt functions     (bnc#979879).

  - CVE-2016-4569: The snd_timer_user_params function in     sound/core/timer.c in the Linux kernel did not     initialize a certain data structure, which allowed local     users to obtain sensitive information from kernel stack     memory via crafted use of the ALSA timer interface     (bnc#979213).

  - CVE-2016-4486: The rtnl_fill_link_ifmap function in     net/core/rtnetlink.c in the Linux kernel did not     initialize a certain data structure, which allowed local     users to obtain sensitive information from kernel stack     memory by reading a Netlink message (bnc#978822).

  - CVE-2016-3134: The netfilter subsystem in the Linux     kernel did not validate certain offset fields, which     allowed local users to gain privileges or cause a denial     of service (heap memory corruption) via an     IPT_SO_SET_REPLACE setsockopt call (bnc#971126).

  - CVE-2016-5696: net/ipv4/tcp_input.c in the Linux kernel     did not properly determine the rate of challenge ACK     segments, which made it easier for man-in-the-middle     attackers to hijack TCP sessions via a blind in-window     attack. (bsc#989152)

  - CVE-2016-6480: Race condition in the ioctl_send_fib     function in drivers/scsi/aacraid/commctrl.c in the Linux     kernel allowed local users to cause a denial of service     (out-of-bounds access or system crash) by changing a     certain size value, aka a 'double fetch' vulnerability.
    (bsc#991608)

The update package also includes non-security fixes. See advisory for details.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Oracle Linux 6 / 7 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2016-3594 advisory.

    kernel-uek     [4.1.12-37.6.3]
    - tcp: make challenge acks less predictable (Eric Dumazet)  [Orabug: 24010103] [Orabug: 2401010]     {CVE-2016-5696}

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 6 / 7 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2016-3595 advisory.

    - tcp: make challenge acks less predictable (Eric Dumazet)  [Orabug: 24010012] [Orabug: 2401010]     {CVE-2016-5696}

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

An update for kernel is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es) :

It was found that the RFC 5961 challenge ACK rate limiting as implemented in the Linux kernel's networking subsystem allowed an off-path attacker to leak certain information about a given connection by creating congestion on the global challenge ACK rate limit counter and then measuring the changes by probing packets. An off-path attacker could use this flaw to either terminate TCP connection and/or inject payload into non-secured TCP connection between two endpoints on the network. (CVE-2016-5696, Important)

Red Hat would like to thank Yue Cao (Cyber Security Group of the CS department of University of California in Riverside) for reporting this issue.

Bug Fix(es) :

* When loading the Direct Rendering Manager (DRM) kernel module, the kernel panicked if DRM was previously unloaded. The kernel panic was caused by a memory leak of the ID Resolver (IDR2). With this update, IDR2 is loaded during kernel boot, and the kernel panic no longer occurs in the described scenario. (BZ#1353827)

* When more than one process attempted to use the 'configfs' directory entry at the same time, a kernel panic in some cases occurred. With this update, a race condition between a directory entry and a lookup operation has been fixed. As a result, the kernel no longer panics in the described scenario. (BZ#1353828)

* When shutting down the system by running the halt -p command, a kernel panic occurred due to a conflict between the kernel offlining CPUs and the sched command, which used the sched group and the sched domain data without first checking the data. The underlying source code has been fixed by adding a check to avoid the conflict. As a result, the described scenario no longer results in a kernel panic.
(BZ#1343894)

* In some cases, running the ipmitool command caused a kernel panic due to a race condition in the ipmi message handler. This update fixes the race condition, and the kernel panic no longer occurs in the described scenario. (BZ#1355980)

* Previously, multiple Very Secure FTP daemon (vsftpd) processes on a directory with a large number of files led to a high contention rate on each inode's spinlock, which caused excessive CPU usage. With this update, a spinlock to protect a single memory-to-memory copy has been removed from the ext4_getattr() function. As a result, system CPU usage has been reduced and is no longer excessive in the described situation. (BZ#1355981)

* When the gfs2_grow utility is used to extend Global File System 2 (GFS2), the next block allocation causes the GFS2 kernel module to re-read its resource group index. If multiple processes in the GFS2 module raced to do the same thing, one process sometimes overwrote a valid object pointer with an invalid pointer, which caused either a kernel panic or a file system corruption. This update ensures that the resource group object pointer is not overwritten. As a result, neither kernel panic nor file system corruption occur in the described scenario. (BZ#1347539)

* Previously, the SCSI Remote Protocol over InfiniBand (IB-SRP) was disabled due to a bug in the srp_queue() function. As a consequence, an attempt to enable the Remote Direct Memory Access (RDMA) at boot caused the kernel to crash. With this update, srp_queue() has been fixed, and the system now boots as expected when RDMA is enabled.
(BZ#1348062)

Enhancement(s) :

* This update optimizes the efficiency of the Transmission Control Protocol (TCP) when the peer is using a window under 537 bytes in size. As a result, devices that use maximum segment size (MSS) of 536 bytes or fewer will experience improved network performance.
(BZ#1354446)

The remote Ubuntu 14.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-3070-4 advisory.

    USN-3070-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the     corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu     14.04 LTS.

    A missing permission check when settings ACLs was discovered in nfsd. A local user could exploit this flaw     to gain access to any file by setting an ACL. (CVE-2016-1237)

    Kangjie Lu discovered an information leak in the Reliable Datagram Sockets (RDS) implementation in the     Linux kernel. A local attacker could use this to obtain potentially sensitive information from kernel     memory. (CVE-2016-5244)

    James Patrick-Evans discovered that the airspy USB device driver in the Linux kernel did not properly     handle certain error conditions. An attacker with physical access could use this to cause a denial of     service (memory consumption). (CVE-2016-5400)

    Yue Cao et al discovered a flaw in the TCP implementation's handling of challenge acks in the Linux     kernel. A remote attacker could use this to cause a denial of service (reset connection) or inject content     into an TCP stream. (CVE-2016-5696)

    Pengfei Wang discovered a race condition in the MIC VOP driver in the Linux kernel. A local attacker could     use this to cause a denial of service (system crash) or obtain potentially sensitive information from     kernel memory. (CVE-2016-5728)

    Cyril Bur discovered that on PowerPC platforms, the Linux kernel mishandled transactional memory state on     exec(). A local attacker could use this to cause a denial of service (system crash) or possibly execute     arbitrary code. (CVE-2016-5828)

    It was discovered that a heap based buffer overflow existed in the USB HID driver in the Linux kernel. A     local attacker could use this cause a denial of service (system crash) or possibly execute arbitrary code.
    (CVE-2016-5829)

    It was discovered that the OverlayFS implementation in the Linux kernel did not properly verify dentry     state before proceeding with unlink and rename operations. A local attacker could use this to cause a     denial of service (system crash). (CVE-2016-6197)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The SUSE Linux Enterprise 12 GA LTSS kernel was updated to 3.12.61 to receive various security and bugfixes. The following feature was implemented :

  - The ext2 filesystem got reenabled and supported to allow     support for 'XIP' (Execute In Place) (FATE#320805). The     following security bugs were fixed :

  - CVE-2017-5551: The tmpfs filesystem implementation in     the Linux kernel preserved the setgid bit during a     setxattr call, which allowed local users to gain group     privileges by leveraging the existence of a setgid     program with restrictions on execute permissions     (bsc#1021258).

  - CVE-2016-7097: The filesystem implementation in the     Linux kernel preserved the setgid bit during a setxattr     call, which allowed local users to gain group privileges     by leveraging the existence of a setgid program with     restrictions on execute permissions (bnc#995968).

  - CVE-2017-2583: A Linux kernel built with the     Kernel-based Virtual Machine (CONFIG_KVM) support was     vulnerable to an incorrect segment selector(SS) value     error. A user/process inside guest could have used this     flaw to crash the guest resulting in DoS or potentially     escalate their privileges inside guest. (bsc#1020602).

  - CVE-2017-2584: arch/x86/kvm/emulate.c in the Linux     kernel allowed local users to obtain sensitive     information from kernel memory or cause a denial of     service (use-after-free) via a crafted application that     leverages instruction emulation for fxrstor, fxsave,     sgdt, and sidt (bnc#1019851).

  - CVE-2016-10088: The sg implementation in the Linux     kernel did not properly restrict write operations in     situations where the KERNEL_DS option is set, which     allowed local users to read or write to arbitrary kernel     memory locations or cause a denial of service     (use-after-free) by leveraging access to a /dev/sg     device, related to block/bsg.c and drivers/scsi/sg.c.
    NOTE: this vulnerability exists because of an incomplete     fix for CVE-2016-9576 (bnc#1017710).

  - CVE-2016-8645: The TCP stack in the Linux kernel     mishandled skb truncation, which allowed local users to     cause a denial of service (system crash) via a crafted     application that made sendto system calls, related to     net/ipv4/tcp_ipv4.c and net/ipv6/tcp_ipv6.c     (bnc#1009969).

  - CVE-2016-8399: An elevation of privilege vulnerability     in the kernel networking subsystem could enable a local     malicious application to execute arbitrary code within     the context of the kernel. This issue is rated as     Moderate because it first requires compromising a     privileged process and current compiler optimizations     restrict access to the vulnerable code. Product:
    Android. Versions: Kernel-3.10, Kernel-3.18. Android ID:
    A-31349935 (bnc#1014746).

  - CVE-2016-9806: Race condition in the netlink_dump     function in net/netlink/af_netlink.c in the Linux kernel     allowed local users to cause a denial of service (double     free) or possibly have unspecified other impact via a     crafted application that made sendmsg system calls,     leading to a free operation associated with a new dump     that started earlier than anticipated (bnc#1013540).

  - CVE-2016-9756: arch/x86/kvm/emulate.c in the Linux     kernel did not properly initialize Code Segment (CS) in     certain error cases, which allowed local users to obtain     sensitive information from kernel stack memory via a     crafted application (bnc#1013038).

  - CVE-2016-9793: The sock_setsockopt function in     net/core/sock.c in the Linux kernel mishandled negative     values of sk_sndbuf and sk_rcvbuf, which allowed local     users to cause a denial of service (memory corruption     and system crash) or possibly have unspecified other     impact by leveraging the CAP_NET_ADMIN capability for a     crafted setsockopt system call with the (1)     SO_SNDBUFFORCE or (2) SO_RCVBUFFORCE option     (bnc#1013531).

  - CVE-2016-7910: Use-after-free vulnerability in the     disk_seqf_stop function in block/genhd.c in the Linux     kernel allowed local users to gain privileges by     leveraging the execution of a certain stop operation     even if the corresponding start operation had failed     (bnc#1010716).

  - CVE-2015-8962: Double free vulnerability in the     sg_common_write function in drivers/scsi/sg.c in the     Linux kernel allowed local users to gain privileges or     cause a denial of service (memory corruption and system     crash) by detaching a device during an SG_IO ioctl call     (bnc#1010501).

  - CVE-2016-7913: The xc2028_set_config function in     drivers/media/tuners/tuner-xc2028.c in the Linux kernel     allowed local users to gain privileges or cause a denial     of service (use-after-free) via vectors involving     omission of the firmware name from a certain data     structure (bnc#1010478).

  - CVE-2016-7911: Race condition in the get_task_ioprio     function in block/ioprio.c in the Linux kernel allowed     local users to gain privileges or cause a denial of     service (use-after-free) via a crafted ioprio_get system     call (bnc#1010711).

  - CVE-2015-8964: The tty_set_termios_ldisc function in     drivers/tty/tty_ldisc.c in the Linux kernel allowed     local users to obtain sensitive information from kernel     memory by reading a tty data structure (bnc#1010507).

  - CVE-2015-8963: Race condition in kernel/events/core.c in     the Linux kernel allowed local users to gain privileges     or cause a denial of service (use-after-free) by     leveraging incorrect handling of an swevent data     structure during a CPU unplug operation (bnc#1010502).

  - CVE-2016-7914: The assoc_array_insert_into_terminal_node     function in lib/assoc_array.c in the Linux kernel did     not check whether a slot is a leaf, which allowed local     users to obtain sensitive information from kernel memory     or cause a denial of service (invalid pointer     dereference and out-of-bounds read) via an application     that uses associative-array data structures, as     demonstrated by the keyutils test suite (bnc#1010475).

  - CVE-2016-8633: drivers/firewire/net.c in the Linux     kernel allowed remote attackers to execute arbitrary     code via crafted fragmented packets (bnc#1008833).

  - CVE-2016-9083: drivers/vfio/pci/vfio_pci.c in the Linux     kernel allowed local users to bypass integer overflow     checks, and cause a denial of service (memory     corruption) or have unspecified other impact, by     leveraging access to a vfio PCI device file for a     VFIO_DEVICE_SET_IRQS ioctl call, aka a 'state machine     confusion bug (bnc#1007197).

  - CVE-2016-9084: drivers/vfio/pci/vfio_pci_intrs.c in the     Linux kernel misused the kzalloc function, which allowed     local users to cause a denial of service (integer     overflow) or have unspecified other impact by leveraging     access to a vfio PCI device file (bnc#1007197).

  - CVE-2016-7042: The proc_keys_show function in     security/keys/proc.c in the Linux kernel uses an     incorrect buffer size for certain timeout data, which     allowed local users to cause a denial of service (stack     memory corruption and panic) by reading the /proc/keys     file (bnc#1004517).

  - CVE-2015-8956: The rfcomm_sock_bind function in     net/bluetooth/rfcomm/sock.c in the Linux kernel allowed     local users to obtain sensitive information or cause a     denial of service (NULL pointer dereference) via vectors     involving a bind system call on a Bluetooth RFCOMM     socket (bnc#1003925).

  - CVE-2016-8658: Stack-based buffer overflow in the     brcmf_cfg80211_start_ap function in     drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg8021     1.c in the Linux kernel allowed local users to cause a     denial of service (system crash) or possibly have     unspecified other impact via a long SSID Information     Element in a command to a Netlink socket (bnc#1004462).

  - CVE-2016-7425: The arcmsr_iop_message_xfer function in     drivers/scsi/arcmsr/arcmsr_hba.c in the Linux kernel did     not restrict a certain length field, which allowed local     users to gain privileges or cause a denial of service     (heap-based buffer overflow) via an     ARCMSR_MESSAGE_WRITE_WQBUFFER control code (bnc#999932).

  - CVE-2016-6327: drivers/infiniband/ulp/srpt/ib_srpt.c in     the Linux kernel allowed local users to cause a denial     of service (NULL pointer dereference and system crash)     by using an ABORT_TASK command to abort a device write     operation (bnc#994748).

  - CVE-2016-6828: The tcp_check_send_head function in     include/net/tcp.h in the Linux kernel did not properly     maintain certain SACK state after a failed data copy,     which allowed local users to cause a denial of service     (tcp_xmit_retransmit_queue use-after-free and system     crash) via a crafted SACK option (bnc#994296).

  - CVE-2016-5696: net/ipv4/tcp_input.c in the Linux kernel     did not properly determine the rate of challenge ACK     segments, which made it easier for remote attackers to     hijack TCP sessions via a blind in-window attack     (bnc#989152).

  - CVE-2016-6130: Race condition in the sclp_ctl_ioctl_sccb     function in drivers/s390/char/sclp_ctl.c in the Linux     kernel allowed local users to obtain sensitive     information from kernel memory by changing a certain     length value, aka a 'double fetch' vulnerability     (bnc#987542).

  - CVE-2016-6480: Race condition in the ioctl_send_fib     function in drivers/scsi/aacraid/commctrl.c in the Linux     kernel allowed local users to cause a denial of service     (out-of-bounds access or system crash) by changing a     certain size value, aka a 'double fetch' vulnerability     (bnc#991608).

  - CVE-2016-4998: The IPT_SO_SET_REPLACE setsockopt     implementation in the netfilter subsystem in the Linux     kernel allowed local users to cause a denial of service     (out-of-bounds read) or possibly obtain sensitive     information from kernel heap memory by leveraging     in-container root access to provide a crafted offset     value that leads to crossing a ruleset blob boundary     (bnc#986362 bnc#986365).

  - CVE-2016-5828: The start_thread function in     arch/powerpc/kernel/process.c in the Linux kernel on     powerpc platforms mishandled transactional state, which     allowed local users to cause a denial of service     (invalid process state or TM Bad Thing exception, and     system crash) or possibly have unspecified other impact     by starting and suspending a transaction before an exec     system call (bnc#986569).

  - CVE-2014-9904: The snd_compress_check_input function in     sound/core/compress_offload.c in the ALSA subsystem in     the Linux kernel did not properly check for an integer     overflow, which allowed local users to cause a denial of     service (insufficient memory allocation) or possibly     have unspecified other impact via a crafted     SNDRV_COMPRESS_SET_PARAMS ioctl call (bnc#986811).

  - CVE-2016-5829: Multiple heap-based buffer overflows in     the hiddev_ioctl_usage function in     drivers/hid/usbhid/hiddev.c in the Linux kernel allow     local users to cause a denial of service or possibly     have unspecified other impact via a crafted (1)     HIDIOCGUSAGES or (2) HIDIOCSUSAGES ioctl call     (bnc#986572).

  - CVE-2016-4470: The key_reject_and_link function in     security/keys/key.c in the Linux kernel did not ensure     that a certain data structure is initialized, which     allowed local users to cause a denial of service (system     crash) via vectors involving a crafted keyctl request2     command (bnc#984755).

The update package also includes non-security fixes. See advisory for details.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote MiracleLinux 4 host has packages installed that are affected by a vulnerability as referenced in the AXSA:2016-679:07 advisory.

    The kernel package contains the Linux kernel (vmlinuz), the core of any     Linux operating system.  The kernel handles the basic functions     of the operating system: memory allocation, process allocation, device     input and output, etc.
    Security issues fixed with this release:
    CVE-2016-5696     net/ipv4/tcp_input.c in the Linux kernel before 4.7 does not properly determine the rate of challenge ACK     segments, which makes it easier for man-in-the-middle attackers to hijack TCP sessions via a blind in-     window attack.
    Fixed bugs:
    * When loading the Direct Rendering Manager (DRM) kernel module, the kernel panicked if DRM was previously     unloaded. The kernel panic was caused by a memory leak of the ID Resolver (IDR2). With this update, IDR2     is loaded during kernel boot, and the kernel panic no longer occurs in the described scenario.
    * When more than one process attempted to use the configfs directory entry at the same time, a kernel     panic in some cases occurred. With this update, a race condition between a directory entry and a lookup     operation has been fixed. As a result, the kernel no longer panics in the described scenario.
    * When shutting down the system by running the halt -p command, a kernel panic occurred due to a conflict     between the kernel offlining CPUs and the sched command, which used the sched group and the sched domain     data without first checking the data. The underlying source code has been fixed by adding a check to avoid     the conflict. As a result, the described scenario no longer results in a kernel panic.
    * In some cases, running the ipmitool command caused a kernel panic due to a race condition in the ipmi     message handler. This update fixes the race condition, and the kernel panic no longer occurs in the     described scenario.
    * Previously, multiple Very Secure FTP daemon (vsftpd) processes on a directory with a large number of     files led to a high contention rate on each inode's spinlock, which caused excessive CPU usage. With this     update, a spinlock to protect a single memory-to-memory copy has been removed from the ext4_getattr()     function. As a result, system CPU usage has been reduced and is no longer excessive in the described     situation.
    * When the gfs2_grow utility is used to extend Global File System 2 (GFS2), the next block allocation     causes the GFS2 kernel module to re-read its resource group index. If multiple processes in the GFS2     module raced to do the same thing, one process sometimes overwrote a valid object pointer with an invalid     pointer, which caused either a kernel panic or a file system corruption. This update ensures that the     resource group object pointer is not overwritten. As a result, neither kernel panic nor file system     corruption occur in the described scenario.
    * Previously, the SCSI Remote Protocol over InfiniBand (IB-SRP) was disabled due to a bug in the     srp_queue() function. As a consequence, an attempt to enable the Remote Direct Memory Access (RDMA) at     boot caused the kernel to crash. With this update, srp_queue() has been fixed, and the system now boots as     expected when RDMA is enabled.
    Enhancements:
    * This update optimizes the efficiency of the Transmission Control Protocol (TCP) when the peer is using a     window under 537 bytes in size. As a result, devices that use maximum segment size (MSS) of 536 bytes or     fewer will experience improved network performance.

Tenable has extracted the preceding description block directly from the MiracleLinux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Update to latest upstream stable release, Linux v4.6.4

For those with Skylake CPUs, please note that there may be instability with a recent microcode update. Read https://www.happyassassin.net/2016/07/07/psa-failure-to-boot-after-ker nel-update-on-skylake-systems/ and look for a system firmware update before installing the kernel.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

An update for kernel is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

It was found that the RFC 5961 challenge ACK rate limiting as implemented in the Linux kernel's networking subsystem allowed an off-path attacker to leak certain information about a given connection by creating congestion on the global challenge ACK rate limit counter and then measuring the changes by probing packets. An off-path attacker could use this flaw to either terminate TCP connection and/or inject payload into non-secured TCP connection between two endpoints on the network. (CVE-2016-5696, Important)

Red Hat would like to thank Yue Cao from Cyber Security Group in the CS department of University of California, Riverside, for reporting this issue.

The remote Oracle Linux 6 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2016-1664 advisory.

    - [net] tcp: make challenge acks less predictable (Florian Westphal) [1355606 1355607] {CVE-2016-5696}

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

USN-3071-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 14.04 LTS for Ubuntu 12.04 LTS.

Kangjie Lu discovered an information leak in the Reliable Datagram Sockets (RDS) implementation in the Linux kernel. A local attacker could use this to obtain potentially sensitive information from kernel memory. (CVE-2016-5244)

Yue Cao et al discovered a flaw in the TCP implementation's handling of challenge acks in the Linux kernel. A remote attacker could use this to cause a denial of service (reset connection) or inject content into an TCP stream. (CVE-2016-5696)

Pengfei Wang discovered a race condition in the MIC VOP driver in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or obtain potentially sensitive information from kernel memory. (CVE-2016-5728)

Cyril Bur discovered that on PowerPC platforms, the Linux kernel mishandled transactional memory state on exec(). A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2016-5828)

It was discovered that a heap based buffer overflow existed in the USB HID driver in the Linux kernel. A local attacker could use this cause a denial of service (system crash) or possibly execute arbitrary code.
(CVE-2016-5829).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Ubuntu 16.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-3070-3 advisory.

    A missing permission check when settings ACLs was discovered in nfsd. A local user could exploit this flaw     to gain access to any file by setting an ACL. (CVE-2016-1237)

    Kangjie Lu discovered an information leak in the Reliable Datagram Sockets (RDS) implementation in the     Linux kernel. A local attacker could use this to obtain potentially sensitive information from kernel     memory. (CVE-2016-5244)

    James Patrick-Evans discovered that the airspy USB device driver in the Linux kernel did not properly     handle certain error conditions. An attacker with physical access could use this to cause a denial of     service (memory consumption). (CVE-2016-5400)

    Yue Cao et al discovered a flaw in the TCP implementation's handling of challenge acks in the Linux     kernel. A remote attacker could use this to cause a denial of service (reset connection) or inject content     into an TCP stream. (CVE-2016-5696)

    Pengfei Wang discovered a race condition in the MIC VOP driver in the Linux kernel. A local attacker could     use this to cause a denial of service (system crash) or obtain potentially sensitive information from     kernel memory. (CVE-2016-5728)

    Cyril Bur discovered that on PowerPC platforms, the Linux kernel mishandled transactional memory state on     exec(). A local attacker could use this to cause a denial of service (system crash) or possibly execute     arbitrary code. (CVE-2016-5828)

    It was discovered that a heap based buffer overflow existed in the USB HID driver in the Linux kernel. A     local attacker could use this cause a denial of service (system crash) or possibly execute arbitrary code.
    (CVE-2016-5829)

    It was discovered that the OverlayFS implementation in the Linux kernel did not properly verify dentry     state before proceeding with unlink and rename operations. A local attacker could use this to cause a     denial of service (system crash). (CVE-2016-6197)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or have other impacts.

  - CVE-2016-5696     Yue Cao, Zhiyun Qian, Zhongjie Wang, Tuan Dao, and     Srikanth V. Krishnamurthy of the University of     California, Riverside; and Lisa M. Marvel of the United     States Army Research Laboratory discovered that Linux's     implementation of the TCP Challenge ACK feature results     in a side channel that can be used to find TCP     connections between specific IP addresses, and to inject     messages into those connections.

  Where a service is made available through TCP, this may allow remote   attackers to impersonate another connected user to the server or to   impersonate the server to another connected user. In case the   service uses a protocol with message authentication (e.g. TLS or   SSH), this vulnerability only allows denial of service (connection   failure). An attack takes tens of seconds, so short-lived TCP   connections are also unlikely to be vulnerable.

  This may be mitigated by increasing the rate limit for TCP Challenge   ACKs so that it is never exceeded: sysctl   net.ipv4.tcp_challenge_ack_limit=1000000000

  - CVE-2016-6136     Pengfei Wang discovered that the audit subsystem has a     'double-fetch' or 'TOCTTOU' bug in its handling of     special characters in the name of an executable. Where     audit logging of execve() is enabled, this allows a     local user to generate misleading log messages.

  - CVE-2016-6480     Pengfei Wang discovered that the aacraid driver for     Adaptec RAID controllers has a 'double-fetch' or     'TOCTTOU' bug in its validation of 'FIB' messages passed     through the ioctl() system call. This has no practical     security impact in current Debian releases.

  - CVE-2016-6828     Marco Grassi reported a 'use-after-free' bug in the TCP     implementation, which can be triggered by local users.
    The security impact is unclear, but might include denial     of service or privilege escalation.

The openSUSE Leap 42.1 kernel was updated to 4.1.31 to receive various security and bugfixes.

The following security bugs were fixed :

  - CVE-2016-2847: fs/pipe.c in the Linux kernel did not     limit the amount of unread data in pipes, which allowed     local users to cause a denial of service (memory     consumption) by creating many pipes with non-default     sizes (bnc#970948).

  - CVE-2016-3134: The netfilter subsystem in the Linux     kernel did not validate certain offset fields, which     allowed local users to gain privileges or cause a denial     of service (heap memory corruption) via an     IPT_SO_SET_REPLACE setsockopt call (bnc#971126).

  - CVE-2016-3156: The IPv4 implementation in the Linux     kernel mishandled destruction of device objects, which     allowed guest OS users to cause a denial of service     (host OS networking outage) by arranging for a large     number of IP addresses (bnc#971360).

  - CVE-2016-4485: The llc_cmsg_rcv function in     net/llc/af_llc.c in the Linux kernel did not initialize     a certain data structure, which allowed attackers to     obtain sensitive information from kernel stack memory by     reading a message (bnc#978821).

  - CVE-2016-4486: The rtnl_fill_link_ifmap function in     net/core/rtnetlink.c in the Linux kernel did not     initialize a certain data structure, which allowed local     users to obtain sensitive information from kernel stack     memory by reading a Netlink message (bnc#978822).

  - CVE-2016-4557: The replace_map_fd_with_map_ptr function     in kernel/bpf/verifier.c in the Linux kernel did not     properly maintain an fd data structure, which allowed     local users to gain privileges or cause a denial of     service (use-after-free) via crafted BPF instructions     that reference an incorrect file descriptor     (bnc#979018).

  - CVE-2016-4580: The x25_negotiate_facilities function in     net/x25/x25_facilities.c in the Linux kernel did not     properly initialize a certain data structure, which     allowed attackers to obtain sensitive information from     kernel stack memory via an X.25 Call Request     (bnc#981267).

  - CVE-2016-4805: Use-after-free vulnerability in     drivers/net/ppp/ppp_generic.c in the Linux kernel     allowed local users to cause a denial of service (memory     corruption and system crash, or spinlock) or possibly     have unspecified other impact by removing a network     namespace, related to the ppp_register_net_channel and     ppp_unregister_channel functions (bnc#980371).

  - CVE-2016-4951: The tipc_nl_publ_dump function in     net/tipc/socket.c in the Linux kernel did not verify     socket existence, which allowed local users to cause a     denial of service (NULL pointer dereference and system     crash) or possibly have unspecified other impact via a     dumpit operation (bnc#981058).

  - CVE-2015-8787: The nf_nat_redirect_ipv4 function in     net/netfilter/nf_nat_redirect.c in the Linux kernel     allowed remote attackers to cause a denial of service     (NULL pointer dereference and system crash) or possibly     have unspecified other impact by sending certain IPv4     packets to an incompletely configured interface, a     related issue to CVE-2003-1604 (bnc#963931).

  - CVE-2016-4569: The snd_timer_user_params function in     sound/core/timer.c in the Linux kernel did not     initialize a certain data structure, which allowed local     users to obtain sensitive information from kernel stack     memory via crafted use of the ALSA timer interface     (bnc#979213).

  - CVE-2016-4578: sound/core/timer.c in the Linux kernel     did not initialize certain r1 data structures, which     allowed local users to obtain sensitive information from     kernel stack memory via crafted use of the ALSA timer     interface, related to the (1) snd_timer_user_ccallback     and (2) snd_timer_user_tinterrupt functions     (bnc#979879).

  - CVE-2016-6828: A use after free in     tcp_xmit_retransmit_queue() was fixed that could be used     by local attackers to crash the kernel (bsc#994296).

  - CVE-2016-6480: Race condition in the ioctl_send_fib     function in drivers/scsi/aacraid/commctrl.c in the Linux     kernel allowed local users to cause a denial of service     (out-of-bounds access or system crash) by changing a     certain size value, aka a 'double fetch' vulnerability     (bnc#991608).

  - CVE-2016-4998: The IPT_SO_SET_REPLACE setsockopt     implementation in the netfilter subsystem in the Linux     kernel allowed local users to cause a denial of service     (out-of-bounds read) or possibly obtain sensitive     information from kernel heap memory by leveraging     in-container root access to provide a crafted offset     value that leads to crossing a ruleset blob boundary     (bnc#986362 986365 990058).

  - CVE-2016-5696: net/ipv4/tcp_input.c in the Linux kernel     did not properly determine the rate of challenge ACK     segments, which made it easier for man-in-the-middle     attackers to hijack TCP sessions via a blind in-window     attack (bnc#989152).

  - CVE-2016-1237: nfsd in the Linux kernel allowed local     users to bypass intended file-permission restrictions by     setting a POSIX ACL, related to nfs2acl.c, nfs3acl.c,     and nfs4acl.c (bnc#986570).

The following non-security bugs were fixed :

  - AF_VSOCK: Shrink the area influenced by prepare_to_wait     (bsc#994520).

  - KVM: arm/arm64: Handle forward time correction     gracefully (bnc#974266).

  - Linux 4.1.29. Refreshed patch:
    patches.xen/xen3-fixup-xen Deleted patches:
    patches.fixes/0001-Revert-ecryptfs-forbid-opening-files-     without-mmap-ha.patch     patches.fixes/0001-ecryptfs-don-t-allow-mmap-when-the-lo     wer-file-system.patch     patches.rpmify/Revert-mm-swap.c-flush-lru-pvecs-on-compo     und-page-ar     patches.rpmify/Revert-powerpc-Update-TM-user-feature-bit     s-in-scan_f

  - Revert 'mm/swap.c: flush lru pvecs on compound page     arrival' (boo#989084).

  - Revert 'powerpc: Update TM user feature bits in     scan_features()'. Fix the build error of 4.1.28 on ppc.

  - Revive i8042_check_power_owner() for 4.1.31 kabi fix.

  - USB: OHCI: Do not mark EDs as ED_OPER if scheduling     fails (bnc#987886).

  - USB: validate wMaxPacketValue entries in endpoint     descriptors (bnc#991665).

  - Update     patches.fixes/0002-nfsd-check-permissions-when-setting-A     CLs.patch (bsc#986570 CVE-2016-1237).

  - Update     patches.fixes/0001-posix_acl-Add-set_posix_acl.patch     (bsc#986570 CVE-2016-1237).

  - netfilter: x_tables: fix 4.1 stable backport     (bsc#989176).

  - nfsd: check permissions when setting ACLs (bsc#986570).

  - posix_acl: Add set_posix_acl (bsc#986570).

  - ppp: defer netns reference release for ppp channel     (bsc#980371).

  - series.conf: Move a kABI patch to its own section

  - supported.conf: enable i2c-designware driver     (bsc#991110)

  - tcp: enable per-socket rate limiting of all 'challenge     acks' (bsc#989152).

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
93370	SUSE SLES11 Security Update : kernel (SUSE-SU-2016:2245-1)	Nessus	SuSE Local Security Checks	2016/9/8	2026/1/27	critical
95592	openSUSE Security Update : the Linux Kernel (openSUSE-2016-1410)	Nessus	SuSE Local Security Checks	2016/12/7	2026/1/15	high
92983	Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2016-3594)	Nessus	Oracle Linux Local Security Checks	2016/8/16	2026/2/9	medium
92984	Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2016-3595)	Nessus	Oracle Linux Local Security Checks	2016/8/16	2026/2/9	medium
93095	RHEL 6 : kernel (RHSA-2016:1664)	Nessus	Red Hat Local Security Checks	2016/8/24	2026/1/28	medium
93099	CentOS 6 : kernel (CESA-2016:1664)	Nessus	CentOS Local Security Checks	2016/8/25	2026/1/28	medium
93243	Ubuntu 14.04 LTS : Linux kernel (Xenial HWE) vulnerabilities (USN-3070-4)	Nessus	Ubuntu Local Security Checks	2016/8/31	2024/8/27	high
97205	SUSE SLES12 Security Update : kernel (SUSE-SU-2017:0471-1)	Nessus	SuSE Local Security Checks	2017/2/16	2026/1/1	high
289490	MiracleLinux 4 : kernel-2.6.32-642.4.2.el6 (AXSA:2016-679:07)	Nessus	Miracle Linux Local Security Checks	2026/1/16	2026/1/19	medium
92444	Fedora 23 : kernel (2016-784d5526d8)	Nessus	Fedora Local Security Checks	2016/7/20	2026/1/30	medium
93052	CentOS 7 : kernel (CESA-2016:1633)	Nessus	CentOS Local Security Checks	2016/8/22	2026/1/28	medium
93093	Oracle Linux 6 : kernel (ELSA-2016-1664)	Nessus	Oracle Linux Local Security Checks	2016/8/24	2026/2/9	medium
93219	Ubuntu 12.04 LTS : linux-lts-trusty vulnerabilities (USN-3071-2)	Nessus	Ubuntu Local Security Checks	2016/8/30	2026/1/27	high
93242	Ubuntu 16.04 LTS : Linux kernel (Qualcomm Snapdragon) vulnerabilities (USN-3070-3)	Nessus	Ubuntu Local Security Checks	2016/8/31	2024/8/27	high
93324	Debian DSA-3659-1 : linux - security update	Nessus	Debian Local Security Checks	2016/9/6	2026/1/27	medium
93445	openSUSE Security Update : the Linux Kernel (openSUSE-2016-1076)	Nessus	SuSE Local Security Checks	2016/9/13	2026/1/26	critical

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