远程 Oracle Linux 6 / 7 主机上安装的程序包受到 ELSA-2019-4316 公告中提及的多个漏洞的影响。- 当用于 Red Hat Enterprise Linux 7、kernel-rt 和 Enterprise MRG 2 时，并且在启用 UEFI 安全启动的情况下启动时，本地用户可利用 Linux 内核，通过在 kexec 重新启动时不正确处理 secure_boot 标记，绕过预期 securelevel/secureboot 限制。(CVE-2015-7837) - 在低于 4.3.3 的 Linux 内核版本中，IPv6 堆栈未正确处理选项数据，本地用户可利用此漏洞，通过构建的 sendmsg 系统调用，获取权限，或造成拒绝服务（释放后使用和系统崩溃）。(CVE-2016-3841) - 在低于 4.11 的 Linux 内核版本以及低于 4.9.36 的 4.9.x 版本中，远程攻击者可利用 net/netfilter/xt_TCPMSS.c 中的 tcpmss_mangle_packet 函数，通过在 iptables 操作中使用存在的 xt_TCPMSS，造成拒绝服务（释放后使用和内存损坏），或可能造成其他不明影响。(CVE-2017-18017) - 在 Linux 内核 4.12、3.10、2.6 及更低版本中，声音系统中存在争用条件漏洞，可造成死锁和拒绝服务情况。(CVE-2018-1000004) - 在低于 4.14.8 的 Linux 内核版本中，Salsa20 加密算法未正确处理零长度输入，本地攻击者可利用此漏洞使用基于 AF_ALG 的 skcipher 接口 (CONFIG_CRYPTO_USER_API_SKCIPHER)，通过执行使用 blkcipher_walk API 的构建系统调用序列，造成拒绝服务（未初始化内存释放和内核崩溃），或造成其他不明影响。Salsa20 的通用实现 (crypto/salsa20_generic.c) 和 x86 实现 (arch/x86/crypto/salsa20_glue.c) 都容易受到漏洞的影响。(CVE-2017-17805) - 在 Linux 内核 4.15.15 及之前版本中，fs/ext4/inode.c 中的 ext4_iget 函数未正确处理 i_links_count 为零时的根目录情况，攻击者可利用此漏洞，通过构建的 ext4 映像，造成拒绝服务（ext4_process_freed_data 空指针取消引用和 OOPS）。(CVE-2018-1092) - 在 wmi_set_ie() 函数中，长度验证码未正确处理无符号整数溢出。因此，在 CAF 中发布的使用 Linux 内核的所有 Android 版本（Android for MSM、Firefox OS for MSM、QRD Android）中，较大“ie_len”参数值可造成缓冲区溢出。(CVE-2018-5848) - 在 Linux 内核 4.15.7 及之前版本中，drivers/scsi/libsas/sas_expander.c 的 sas_smp_get_phy_events 函数中存在内存泄漏，本地用户可利用此漏洞，通过对 /sys/class/sas_phy 目录中的文件多次读取访问，造成拒绝服务（内存消耗），/sys/class/sas_phy/phy-1: 0: 12/invalid_dword_count 文件即为一例。(CVE-2018-7757) - 发现原始 midi 内核驱动程序未防御并发访问，导致 rawmidi.c 文件内 snd_rawmidi_ioctl() 处理程序中的 snd_rawmidi_input_params() 和 snd_rawmidi_output_status() 中出现双重 realloc（双重释放）。本地恶意攻击者可能利用此问题，提升权限。(CVE-2018-10902) - 内核 scsi 驱动程序中存在权限提升漏洞。产品：Android。版本：Android 内核。
Android ID A-65023233。(CVE-2017-13168) - **存在争议** Linux 内核 3.18 至 4.16 版本未正确使用 dxfer_direction=SG_DXFER_FROM_DEV 和 6 字节空 cmdp 来处理 /dev/sg0 中的 SG_IO ioctl。此漏洞可导致最多将 1000 个内核堆页面复制到用户空间。此问题已在 http://www.nessus.org/u?5d4e77b1 中的上游版本中修复。此问题影响的范围有限，因为用户通常无权访问 SCSI 设备。此外，Nero 用户手册建议通过执行“chmod o+r+w /dev/sg*”访问这些设备。注意：第三方对此报告的相关内容存在争议，并指出攻击者必须使用 CAP_SYS_ADMIN 和 CAP_SYS_RAWIO 功能，因此很难利用此漏洞。(CVE-2018-1000204) - 在 Linux 内核 4.19 及之前版本中发现一个问题。本地攻击者可利用 drivers/cdrom/cdrom.c 的 cdrom_ioctl_select_disc 中的信息泄露读取内核内存，因为从未签名的 long 转换到 int 会干扰边界检查。此问题类似于 CVE-2018-10940 和 CVE-2018-16658。(CVE-2018-18710) - 在低于 3.18.2 的 Linux 内核版本中，UDF 文件系统实现未验证某些长度，本地用户可利用此漏洞，通过构建的文件系统映像，造成拒绝服务（缓冲区过度读取和系统崩溃），此问题与 fs/udf/inode.c 和 fs/udf/symlink.c 相关。(CVE-2014-9728) - 在低于 4.6.1 的 Linux 内核版本中，arch/x86/kvm/mtrr.c 中的 msr_mtrr_valid 函数支持 MSR 0x2f8，客户机操作系统用户可利用此漏洞在 kvm_arch_vcpu 数据结构中读取或写入数据，从而通过构建的 ioctl 调用，获取敏感信息或造成拒绝服务（系统崩溃）。(CVE-2016-3713) - 在低于 4.14.8 的 Linux 内核版本中，HMAC 实现 (crypto/hmac.c) 未验证底层加密哈希算法是否未加密，本地攻击者可利用此漏洞使用基于 AF_ALG 的哈希接口 (CONFIG_CRYPTO_USER_API_HASH) 和 SHA-3 哈希算法 (CONFIG_CRYPTO_SHA3)，通过执行缺少 SHA-3 初始化的构建系统调用序列，造成内核堆栈缓冲区溢出。(CVE-2017-17806) -  在 Linux 内核 4.15.7 及之前版本的 drivers/block/floppy.c 中的 fd_locked_ioctl 函数中发现一个问题。软盘驱动程序将内核指针复制到用户内存，可响应 FDGETPRM ioctl。攻击者可发送 FDGETPRM ioctl 并使用已获取的内核指针，发现内核代码和数据的位置，并绕过内核安全保护机制，例如 KASLR。(CVE-2018-7755) - **存在争议
** 在低于 4.16 的 Linux 内核版本中，本地用户可利用 drivers/scsi/libsas/sas_scsi_host.c，通过触发某些失败情形，造成拒绝服务（ata qc 泄露）。注意：第三方对此报告的相关内容存在争议，因为只有在物理邻近攻击者拔出 SAS 主机总线适配器电缆时才会造成失败。
(CVE-2018-10021) - 在低于 4.12.4 的 Linux 内核版本中，攻击者可利用 drivers/input/serio/i8042.c，造成拒绝服务（空指针取消引用和系统崩溃），或可能造成其他不明影响，这是经过验证后 port->exists 值会更改所致。(CVE-2017-18079) - 在 Linux 内核 4.12.10 及之前版本中，drivers/scsi/qla2xxx/qla_attr.c 中的 qla2x00_sysfs_write_optrom_ctl 函数中存在整数溢出，本地用户可利用此漏洞，通过使用根访问权，造成拒绝服务（内存损坏和系统崩溃）。
(CVE-2017-14051) - 在 Linux 内核 4.14.4 及之前版本中，对于 add_callback 和 remove_callback 操作，net/netfilter/xt_osf.c 不需要使用 CAP_NET_ADMIN 功能，本地用户可利用此漏洞，绕过预期访问限制，这是跨所有网络命名空间共享 xt_osf_fingers 数据结构所致。(CVE-2017-17450) - **存在争议** 在 Linux 内核 4.15.7 及之前版本中，arch/x86/kernel/cpu/mcheck/mce.c 中的 store_int_with_restart() 函数中存在争用条件，本地用户可利用此漏洞，通过使用根访问权限在 /sys/devices/system/machinecheck/machinecheck 目录中的 check_interval 文件中写入数据，造成拒绝服务（错误）。注意：第三方指出此报告与安全无关。(CVE-2018-7995) - 在 drivers/hid/hid-debug.c 的 hid_debug_events_read 中，可能存在越界写入，这是缺少边界检查所致。这可能会导致本地权限提升，并需要系统执行权限。不需用户交互即可恶意利用。产品：Android 版本：Android 内核 Android ID：A-71361580。(CVE-2018-9516) 请注意，Nessus 没有测试此问题，而仅依赖于应用程序自我报告的版本号。

According to the versions of the kernel packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - Use-after-free vulnerability in the disk_seqf_stop     function in block/genhd.c in the Linux kernel before     4.7.1 allows local users to gain privileges by     leveraging the execution of a certain stop operation     even if the corresponding start operation had     failed.(CVE-2016-7910)

  - Race condition in the get_task_ioprio function in     block/ioprio.c in the Linux kernel before 4.6.6 allows     local users to gain privileges or cause a denial of     service (use-after-free) via a crafted ioprio_get     system call.(CVE-2016-7911)

  - The assoc_array_insert_into_terminal_node function in     lib/assoc_array.c in the Linux kernel before 4.5.3 does     not check whether a slot is a leaf, which allows 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.(CVE-2016-7914)

  - The IPv6 stack in the Linux kernel before 4.3.3     mishandles options data, which allows local users to     gain privileges or cause a denial of service     (use-after-free and system crash) via a crafted sendmsg     system call.(CVE-2016-3841)

  - Race condition in the environ_read function in     fs/proc/base.c in the Linux kernel before 4.5.4 allows     local users to obtain sensitive information from kernel     memory by reading a /proc/*/environ file during a     process-setup time interval in which     environment-variable copying is     incomplete.(CVE-2016-7916)

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

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2016:2695 advisory.

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

    Security Fix(es):

    * It was found that the Linux kernel's IPv6 implementation mishandled socket options. A local attacker     could abuse concurrent access to the socket options to escalate their privileges, or cause a denial of     service (use-after-free and system crash) via a crafted sendmsg system call. (CVE-2016-3841, Important)

    Additional Changes:

    Space precludes documenting all of the bug fixes and enhancements included in this advisory. To see the     complete list of bug fixes and enhancements, refer to the following KnowledgeBase article:
    https://access.redhat.com/articles/2754251

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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.

According to the versions of the kernel packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - The snd_timer_interrupt function in sound/core/timer.c     in the Linux kernel before 4.4.1 does not properly     maintain a certain linked list, which allows local     users to cause a denial of service (race condition and     system crash) via a crafted ioctl call.(CVE-2016-2545)

  - sound/core/timer.c in the Linux kernel before 4.4.1     uses an incorrect type of mutex, which allows local     users to cause a denial of service (race condition,     use-after-free, and system crash) via a crafted ioctl     call.(CVE-2016-2546)

  - sound/core/timer.c in the Linux kernel before 4.4.1     employs a locking approach that does not consider slave     timer instances, which allows local users to cause a     denial of service (race condition, use-after-free, and     system crash) via a crafted ioctl call.(CVE-2016-2547)

  - sound/core/timer.c in the Linux kernel before 4.4.1     retains certain linked lists after a close or stop     action, which allows local users to cause a denial of     service (system crash) via a crafted ioctl call,     related to the (1) snd_timer_close and (2)
    _snd_timer_stop functions.(CVE-2016-2548)

  - sound/core/hrtimer.c in the Linux kernel before 4.4.1     does not prevent recursive callback access, which     allows local users to cause a denial of service     (deadlock) via a crafted ioctl call.(CVE-2016-2549)

  - A resource-exhaustion vulnerability was found in the     kernel, where an unprivileged process could allocate     and accumulate far more file descriptors than the     process' limit. A local, unauthenticated user could     exploit this flaw by sending file descriptors over a     Unix socket and then closing them to keep the process'     fd count low, thereby creating kernel-memory or     file-descriptors exhaustion (denial of     service).(CVE-2016-2550)

  - It is possible for a single process to cause an OOM     condition by filling large pipes with data that are     never read. A typical process filling 4096 pipes with 1     MB of data will use 4 GB of memory and there can be     multiple such processes, up to a     per-user-limit.(CVE-2016-2847)

  - A security flaw was found in the Linux kernel that an     attempt to move page mapped by AIO ring buffer to the     other node triggers NULL pointer dereference at     trace_writeback_dirty_page(), because     aio_fs_backing_dev_info.dev is 0.(CVE-2016-3070)

  - A security flaw was found in the Linux kernel in the     mark_source_chains() function in     'net/ipv4/netfilter/ip_tables.c'. It is possible for a     user-supplied 'ipt_entry' structure to have a large     'next_offset' field. This field is not bounds checked     prior to writing to a counter value at the supplied     offset.(CVE-2016-3134)

  - An integer overflow vulnerability was found in the     Linux kernel in xt_alloc_table_info, which on 32-bit     systems can lead to small structure allocation and a     copy_from_user based heap corruption.(CVE-2016-3135)

  - The mct_u232_msr_to_state function in     drivers/usb/serial/mct_u232.c in the Linux kernel     before 4.5.1 allows physically proximate attackers to     cause a denial of service (NULL pointer dereference and     system crash) via a crafted USB device without two     interrupt-in endpoint descriptors.(CVE-2016-3136)

  - drivers/usb/serial/cypress_m8.c in the Linux kernel     before 4.5.1 allows physically proximate attackers to     cause a denial of service (NULL pointer dereference and     system crash) via a USB device without both an     interrupt-in and an interrupt-out endpoint descriptor,     related to the cypress_generic_port_probe and     cypress_open functions.(CVE-2016-3137)

  - The acm_probe function in drivers/usb/class/cdc-acm.c     in the Linux kernel before 4.5.1 allows physically     proximate attackers to cause a denial of service (NULL     pointer dereference and system crash) via a USB device     without both a control and a data endpoint     descriptor.(CVE-2016-3138)

  - The wacom_probe function in     drivers/input/tablet/wacom_sys.c in the Linux kernel     before 3.17 allows 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.(CVE-2016-3139)

  - The digi_port_init function in     drivers/usb/serial/digi_acceleport.c in the Linux     kernel before 4.5.1 allows 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.(CVE-2016-3140)

  - 'A security flaw was found in the Linux kernel's     networking subsystem that destroying the network     interface with huge number of ipv4 addresses assigned     keeps ''rtnl_lock'' spinlock for a very long time (up     to hour). This blocks many network-related operations,     including creation of new incoming ssh connections.

  - The problem is especially important for containers, as     the container owner has enough permissions to trigger     this and block a network access on a whole host,     outside the container.(CVE-2016-3156)'

  - A weakness was found in the Linux ASLR implementation.
    Any user able to running 32-bit applications in a x86     machine can disable ASLR by setting the RLIMIT_STACK     resource to unlimited.(CVE-2016-3672)

  - The ims_pcu_parse_cdc_data function in     drivers/input/misc/ims-pcu.c in the Linux kernel before     4.5.1 allows physically proximate attackers to cause a     denial of service (system crash) via a USB device     without both a master and a slave     interface.(CVE-2016-3689)

  - It was found that the Linux kernel's IPv6     implementation mishandled socket options. A local     attacker could abuse concurrent access to the socket     options to escalate their privileges, or cause a denial     of service (use-after-free and system crash) via a     crafted sendmsg system call.(CVE-2016-3841)

  - The usbip_recv_xbuff function in     drivers/usb/usbip/usbip_common.c in the Linux kernel     before 4.5.3 allows 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.(CVE-2016-3955)

  - A flaw was found in the Linux kernel's keyring handling     code: the key_reject_and_link() function could be     forced to free an arbitrary memory block. An attacker     could use this flaw to trigger a use-after-free     condition on the system, potentially allowing for     privilege escalation.(CVE-2016-4470)

  - The proc_connectinfo() function in     'drivers/usb/core/devio.c' in the Linux kernel through     4.6 does not initialize a certain data structure, which     allows local users to obtain sensitive information from     kernel stack memory via a crafted USBDEVFS_CONNECTINFO     ioctl call. The stack object 'ci' has a total size of 8     bytes. Its last 3 bytes are padding bytes which are not     initialized and are leaked to userland.(CVE-2016-4482)

  - A flaw was found in the way certain interfaces of the     Linux kernel's Infiniband subsystem used write() as     bi-directional ioctl() replacement, which could lead to     insufficient memory security checks when being invoked     using the splice() system call. A local unprivileged     user on a system with either Infiniband hardware     present or RDMA Userspace Connection Manager Access     module explicitly loaded, could use this flaw to     escalate their privileges on the system.(CVE-2016-4565)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. 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.

Security Fix(es) :

* It was found that the Linux kernel's IPv6 implementation mishandled socket options. A local attacker could abuse concurrent access to the socket options to escalate their privileges, or cause a denial of service (use-after-free and system crash) via a crafted sendmsg system call. (CVE-2016-3841, Important)

* Several Moderate and Low impact security issues were found in the Linux kernel. Space precludes documenting each of these issues in this advisory. Refer to the CVE links in the References section for a description of each of these vulnerabilities. (CVE-2013-4312, CVE-2015-8374, CVE-2015-8543, CVE-2015-8812, CVE-2015-8844, CVE-2015-8845, CVE-2016-2053, CVE-2016-2069, CVE-2016-2847, CVE-2016-3156, CVE-2016-4581, CVE-2016-4794, CVE-2016-5412, CVE-2016-5828, CVE-2016-5829, CVE-2016-6136, CVE-2016-6198, CVE-2016-6327, CVE-2016-6480, CVE-2015-8746, CVE-2015-8956, CVE-2016-2117, CVE-2016-2384, CVE-2016-3070, CVE-2016-3699, CVE-2016-4569, CVE-2016-4578)

Red Hat would like to thank Philip Pettersson (Samsung) for reporting CVE-2016-2053; Tetsuo Handa for reporting CVE-2016-2847; the Virtuozzo kernel team and Solar Designer (Openwall) for reporting CVE-2016-3156;
Justin Yackoski (Cryptonite) for reporting CVE-2016-2117; and Linn Crosetto (HP) for reporting CVE-2016-3699. The CVE-2015-8812 issue was discovered by Venkatesh Pottem (Red Hat Engineering); the CVE-2015-8844 and CVE-2015-8845 issues were discovered by Miroslav Vadkerti (Red Hat Engineering); the CVE-2016-4581 issue was discovered by Eric W. Biederman (Red Hat); the CVE-2016-6198 issue was discovered by CAI Qian (Red Hat); and the CVE-2016-3070 issue was discovered by Jan Stancek (Red Hat).

Additional Changes :

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.3 Release Notes linked from the References section.

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

  - CVE-2015-8970: crypto/algif_skcipher.c in the Linux     kernel did not verify that a setkey operation has been     performed on an AF_ALG socket before an accept system     call is processed, which allowed local users to cause a     denial of service (NULL pointer dereference and system     crash) via a crafted application that did not supply a     key, related to the lrw_crypt function in crypto/lrw.c     (bnc#1008374).

  - CVE-2017-5551: Clear S_ISGID on tmpfs when setting posix     ACLs (bsc#1021258).

  - CVE-2016-7097: The filesystem implementation in the     Linux kernel preserves 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-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-2004-0230: TCP, when using a large Window Size, made     it easier for remote attackers to guess sequence numbers     and cause a denial of service (connection loss) to     persistent TCP connections by repeatedly injecting a TCP     RST packet, especially in protocols that use long-lived     connections, such as BGP (bnc#969340).

  - CVE-2016-8632: The tipc_msg_build function in     net/tipc/msg.c in the Linux kernel did not validate the     relationship between the minimum fragment length and the     maximum packet size, which allowed local users to gain     privileges or cause a denial of service (heap-based     buffer overflow) by leveraging the CAP_NET_ADMIN     capability (bnc#1008831).

  - CVE-2016-8399: An elevation of privilege vulnerability     in the kernel networking subsystem could have enabled a     local malicious application to execute arbitrary code     within the context of the kernel bnc#1014746).

  - 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-2012-6704: 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_SNDBUF or     (2) SO_RCVBUF option (bnc#1013542).

  - 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-2016-3841: The IPv6 stack in the Linux kernel     mishandled options data, which allowed local users to     gain privileges or cause a denial of service     (use-after-free and system crash) via a crafted sendmsg     system call (bnc#992566).

  - CVE-2016-9685: Multiple memory leaks in error paths in     fs/xfs/xfs_attr_list.c in the Linux kernel allowed local     users to cause a denial of service (memory consumption)     via crafted XFS filesystem operations (bnc#1012832).

  - CVE-2015-1350: The VFS subsystem in the Linux kernel     provided an incomplete set of requirements for setattr     operations that underspecifies removing extended     privilege attributes, which allowed local users to cause     a denial of service (capability stripping) via a failed     invocation of a system call, as demonstrated by using     chown to remove a capability from the ping or Wireshark     dumpcap program (bnc#914939).

  - 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-2016-9555: The sctp_sf_ootb function in     net/sctp/sm_statefuns.c in the Linux kernel lacked     chunk-length checking for the first chunk, which allowed     remote attackers to cause a denial of service     (out-of-bounds slab access) or possibly have unspecified     other impact via crafted SCTP data (bnc#1011685).

  - 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-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-2016-7916: Race condition in the environ_read     function in fs/proc/base.c in the Linux kernel allowed     local users to obtain sensitive information from kernel     memory by reading a /proc/*/environ file during a     process-setup time interval in which     environment-variable copying is incomplete     (bnc#1010467).

  - CVE-2016-8646: The hash_accept function in     crypto/algif_hash.c in the Linux kernel allowed local     users to cause a denial of service (OOPS) by attempting     to trigger use of in-kernel hash algorithms for a socket     that has received zero bytes of data (bnc#1010150).

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

  - CVE-2016-7042: The proc_keys_show function in     security/keys/proc.c in the Linux, when the GNU Compiler     Collection (gcc) stack protector is enabled, used 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-2016-7117: Use-after-free vulnerability in the
    __sys_recvmmsg function in net/socket.c in the Linux     kernel allowed remote attackers to execute arbitrary     code via vectors involving a recvmmsg system call that     is mishandled during error processing (bnc#1003077).

  - CVE-2016-0823: The pagemap_open function in     fs/proc/task_mmu.c in the Linux kernel allowed local     users to obtain sensitive physical-address information     by reading a pagemap file (bnc#994759).

  - 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-2016-6828: 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).

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.

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 Moderate. 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 reporting emulation failures to user space could lead to either a local (CVE-2014-7842) or a L2->L1 (CVE-2010-5313) denial of service. In the case of a local denial of service, an attacker must have access to the MMIO area or be able to access an I/O port. Please note that on certain systems, HPET is mapped to userspace as part of vdso (vvar) and thus an unprivileged user may generate MMIO transactions (and enter the emulator) this way. (CVE-2010-5313, CVE-2014-7842, Moderate)

* It was found that the Linux kernel did not properly account file descriptors passed over the unix socket against the process limit. A local user could use this flaw to exhaust all available memory on the system. (CVE-2013-4312, Moderate)

* A buffer overflow flaw was found in the way the Linux kernel's virtio-net subsystem handled certain fraglists when the GRO (Generic Receive Offload) functionality was enabled in a bridged network configuration. An attacker on the local network could potentially use this flaw to crash the system, or, although unlikely, elevate their privileges on the system. (CVE-2015-5156, Moderate)

* It was found that the Linux kernel's IPv6 network stack did not properly validate the value of the MTU variable when it was set. A remote attacker could potentially use this flaw to disrupt a target system's networking (packet loss) by setting an invalid MTU value, for example, via a NetworkManager daemon that is processing router advertisement packets running on the target system. (CVE-2015-8215, Moderate)

* A NULL pointer dereference flaw was found in the way the Linux kernel's network subsystem handled socket creation with an invalid protocol identifier. A local user could use this flaw to crash the system. (CVE-2015-8543, Moderate)

* It was found that the espfix functionality does not work for 32-bit KVM paravirtualized guests. A local, unprivileged guest user could potentially use this flaw to leak kernel stack addresses.
(CVE-2014-8134, Low)

* A flaw was found in the way the Linux kernel's ext4 file system driver handled non-journal file systems with an orphan list. An attacker with physical access to the system could use this flaw to crash the system or, although unlikely, escalate their privileges on the system. (CVE-2015-7509, Low)

* A NULL pointer dereference flaw was found in the way the Linux kernel's ext4 file system driver handled certain corrupted file system images. An attacker with physical access to the system could use this flaw to crash the system. (CVE-2015-8324, Low)

Red Hat would like to thank Nadav Amit for reporting CVE-2010-5313 and CVE-2014-7842, Andy Lutomirski for reporting CVE-2014-8134, and Dmitriy Monakhov (OpenVZ) for reporting CVE-2015-8324. The CVE-2015-5156 issue was discovered by Jason Wang (Red Hat).

Additional Changes :

* Refer to Red Hat Enterprise Linux 6.8 Release Notes for information on new kernel features and known issues, and Red Hat Enterprise Linux Technical Notes for information on device driver updates, important changes to external kernel parameters, notable bug fixes, and technology previews. Both of these documents are linked to in the References section.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
120977	Oracle Linux 6 / 7：Unbreakable Enterprise 内核 (ELSA-2019-4316)	Nessus	Oracle Linux Local Security Checks	2019/1/7	2024/10/23	critical
99846	EulerOS 2.0 SP1 : kernel (EulerOS-SA-2016-1089)	Nessus	Huawei Local Security Checks	2017/5/1	2021/1/6	high
94667	RHEL 7 : kernel (RHSA-2016:2695)	Nessus	Red Hat Local Security Checks	2016/11/10	2024/11/4	high
124816	EulerOS Virtualization 3.0.1.0 : kernel (EulerOS-SA-2019-1492)	Nessus	Huawei Local Security Checks	2019/5/13	2024/5/23	critical
94537	RHEL 7 : kernel (RHSA-2016:2574)	Nessus	Red Hat Local Security Checks	2016/11/4	2019/10/24	critical
97297	SUSE SLES11 Security Update : kernel (SUSE-SU-2017:0494-1)	Nessus	SuSE Local Security Checks	2017/2/21	2021/1/19	critical
91077	RHEL 6 : kernel (RHSA-2016:0855)	Nessus	Red Hat Local Security Checks	2016/5/12	2019/10/24	high

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