An update of the linux package has been released.

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) :

* A flaw named FragmentSmack was found in the way the Linux kernel handled reassembly of fragmented IPv4 and IPv6 packets. A remote attacker could use this flaw to trigger time and calculation expensive fragment reassembly algorithm by sending specially crafted packets which could lead to a CPU saturation and hence a denial of service on the system. (CVE-2018-5391)

* kernel: out-of-bounds access in the show_timer function in kernel/time/ posix-timers.c (CVE-2017-18344)

* kernel: Integer overflow in udl_fb_mmap() can allow attackers to execute code in kernel space (CVE-2018-8781)

* kernel: MIDI driver race condition leads to a double-free (CVE-2018-10902)

* kernel: Missing check in inode_init_owner() does not clear SGID bit on non-directories for non-members (CVE-2018-13405)

* kernel: AIO write triggers integer overflow in some protocols (CVE-2015-8830)

* kernel: Use-after-free in snd_pcm_info function in ALSA subsystem potentially leads to privilege escalation (CVE-2017-0861)

* kernel: Handling of might_cancel queueing is not properly pretected against race (CVE-2017-10661)

* kernel: Salsa20 encryption algorithm does not correctly handle zero-length inputs allowing local attackers to cause denial of service (CVE-2017-17805)

* kernel: Inifinite loop vulnerability in madvise_willneed() function allows local denial of service (CVE-2017-18208)

* kernel: fuse-backed file mmap-ed onto process cmdline arguments causes denial of service (CVE-2018-1120)

* kernel: a NULL pointer dereference in dccp_write_xmit() leads to a system crash (CVE-2018-1130)

* kernel: drivers/block/loop.c mishandles lo_release serialization allowing denial of service (CVE-2018-5344)

* kernel: Missing length check of payload in _sctp_make_chunk() function allows denial of service (CVE-2018-5803)

* kernel: buffer overflow in drivers/net/wireless/ath/wil6210/ wmi.c:wmi_set_ie() may lead to memory corruption (CVE-2018-5848)

* kernel: out-of-bound write in ext4_init_block_bitmap function with a crafted ext4 image (CVE-2018-10878)

* kernel: Improper validation in bnx2x network card driver can allow for denial of service attacks via crafted packet (CVE-2018-1000026)

* kernel: Information leak when handling NM entries containing NUL (CVE-2016-4913)

* kernel: Mishandling mutex within libsas allowing local Denial of Service (CVE-2017-18232)

* kernel: NULL pointer dereference in ext4_process_freed_data() when mounting crafted ext4 image (CVE-2018-1092)

* kernel: NULL pointer dereference in ext4_xattr_inode_hash() causes crash with crafted ext4 image (CVE-2018-1094)

* kernel: vhost: Information disclosure in vhost/vhost.c:vhost_new_msg() (CVE-2018-1118)

* kernel: Denial of service in resv_map_release function in mm/hugetlb.c (CVE-2018-7740)

* kernel: Memory leak in the sas_smp_get_phy_events function in drivers/scsi/ libsas/sas_expander.c (CVE-2018-7757)

* kernel: Invalid pointer dereference in xfs_ilock_attr_map_shared() when mounting crafted xfs image allowing denial of service (CVE-2018-10322)

* kernel: use-after-free detected in ext4_xattr_set_entry with a crafted file (CVE-2018-10879)

* kernel: out-of-bound access in ext4_get_group_info() when mounting and operating a crafted ext4 image (CVE-2018-10881)

* kernel: stack-out-of-bounds write in jbd2_journal_dirty_metadata function (CVE-2018-10883)

* kernel: incorrect memory bounds check in drivers/cdrom/cdrom.c (CVE-2018-10940)

Red Hat would like to thank Juha-Matti Tilli (Aalto University - Department of Communications and Networking and Nokia Bell Labs) for reporting CVE-2018-5391; Trend Micro Zero Day Initiative for reporting CVE-2018-10902; Qualys Research Labs for reporting CVE-2018-1120;
Evgenii Shatokhin (Virtuozzo Team) for reporting CVE-2018-1130; and Wen Xu for reporting CVE-2018-1092 and CVE-2018-1094.

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

  - A security flaw was found in the ip_frag_reasm()     function in net/ipv4/ip_fragment.c in the Linux kernel     which can cause a later system crash in     ip_do_fragment(). With certain non-default, but     non-rare, configuration of a victim host, an attacker     can trigger this crash remotely, thus leading to a     remote denial of service.(CVE-2018-14641)

  - A flaw named FragmentSmack was found in the way the     Linux kernel handled reassembly of fragmented IPv4 and     IPv6 packets. A remote attacker could use this flaw to     trigger time and calculation expensive fragment     reassembly algorithm by sending specially crafted     packets which could lead to a CPU saturation and hence     a denial of service on the system.(CVE-2018-5391)

  - The resv_map_release function in mm/hugetlb.c in the     Linux kernel, through 4.15.7, allows local users to     cause a denial of service (BUG) via a crafted     application that makes mmap system calls and has a     large pgoff argument to the remap_file_pages system     call. (CVE-2018-7740)

  - A use-after-free vulnerability was found in the way the     Linux kernel's KVM hypervisor emulates a preemption     timer for L2 guests when nested (=1) virtualization is     enabled. This high resolution timer(hrtimer) runs when     a L2 guest is active. After VM exit, the sync_vmcs12()     timer object is stopped. The use-after-free occurs if     the timer object is freed before calling sync_vmcs12()     routine. A guest user/process could use this flaw to     crash the host kernel resulting in a denial of service     or, potentially, gain privileged access to a system.
    (CVE-2019-7221)

  - An information leakage issue was found in the way Linux     kernel's KVM hypervisor handled page fault exceptions     while emulating instructions like VMXON, VMCLEAR,     VMPTRLD, and VMWRITE with memory address as an operand.
    It occurs if the operand is a mmio address, as the     returned exception object holds uninitialized stack     memory contents. A guest user/process could use this     flaw to leak host's stack memory contents to a guest.
    (CVE-2019-7222)

  - The xfs_dinode_verify function in     fs/xfs/libxfs/xfs_inode_buf.c in the Linux kernel can     cause a NULL pointer dereference in     xfs_ilock_attr_map_shared function. An attacker could     trick a legitimate user or a privileged attacker could     exploit this by mounting a crafted xfs filesystem image     to cause a kernel panic and thus a denial of service.
    (CVE-2018-10322)

  - The Linux kernel is vulnerable to a NULL pointer     dereference in the     ext4/mballoc.c:ext4_process_freed_data() function. An     attacker could trick a legitimate user or a privileged     attacker could exploit this by mounting a crafted ext4     image to cause a kernel panic.(CVE-2018-1092)

  - The Linux kernel is vulnerable to a NULL pointer     dereference in the ext4/xattr.c:ext4_xattr_inode_hash()     function. An attacker could trick a legitimate user or     a privileged attacker could exploit this to cause a     NULL pointer dereference with a crafted ext4 image.
    (CVE-2018-1094)

  - An issue was discovered in the XFS filesystem in     fs/xfs/libxfs/xfs_attr_leaf.c in the Linux kernel. A     NULL pointer dereference may occur for a corrupted xfs     image after xfs_da_shrink_inode() is called with a NULL     bp. This can lead to a system crash and a denial of     service. (CVE-2018-13094)

  - A flaw was found in the Linux kernel with files on     tmpfs and hugetlbfs. An attacker is able to bypass file     permissions on filesystems mounted with tmpfs/hugetlbs     to modify a file and possibly disrupt normal system     behavior. At this time there is an understanding there     is no crash or privilege escalation but the impact of     modifications on these filesystems of files in     production systems may have adverse affects.
    (CVE-2018-18397)

  - A use-after-free flaw can occur in the Linux kernel due     to a race condition between packet_do_bind() and     packet_notifier() functions called for an AF_PACKET     socket. An unprivileged, local user could use this flaw     to induce kernel memory corruption on the system,     leading to an unresponsive system or to a crash. Due to     the nature of the flaw, privilege escalation cannot be     fully ruled out. (CVE-2018-18559)

  - A flaw was found In the Linux kernel, through version     4.19.6, where a local user could exploit a     use-after-free in the ALSA driver by supplying a     malicious USB Sound device (with zero interfaces) that     is mishandled in usb_audio_probe in sound/usb/card.c.
    An attacker could corrupt memory and possibly escalate     privileges if the attacker is able to have physical     access to the system.(CVE-2018-19824)

  - An issue was discovered in the Linux kernel before     4.18.11. The ipddp_ioctl function in     drivers/net/appletalk/ipddp.c allows local users to     obtain sensitive kernel address information by     leveraging CAP_NET_ADMIN to read the ipddp_route dev     and next fields via an SIOCFINDIPDDPRT ioctl call.
    (CVE-2018-20511)

  - A use-after-free vulnerability was found in the way the     Linux kernel's KVM hypervisor implements its device     control API. While creating a device via     kvm_ioctl_create_device(), the device holds a reference     to a VM object, later this reference is transferred to     the caller's file descriptor table. If such file     descriptor was to be closed, reference count to the VM     object could become zero, potentially leading to a     use-after-free issue. A user/process could use this     flaw to crash the guest VM resulting in a denial of     service issue or, potentially, gain privileged access     to a system. (CVE-2019-6974)

  - Since Linux kernel version 3.2, the mremap() syscall     performs TLB flushes after dropping pagetable locks. If     a syscall such as ftruncate() removes entries from the     pagetables of a task that is in the middle of mremap(),     a stale TLB entry can remain for a short time that     permits access to a physical page after it has been     released back to the page allocator and     reused.(CVE-2018-18281)

  - A division-by-zero in set_termios(), when debugging is     enabled, was found in the Linux kernel. When the     [io_ti] driver is loaded, a local unprivileged attacker     can request incorrect high transfer speed in the     change_port_settings() in the     drivers/usb/serial/io_ti.c so that the divisor value     becomes zero and causes a system crash resulting in a     denial of service. (CVE-2017-18360)

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 Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2018-4304 advisory.

    - RDS: null pointer dereference in rds_atomic_free_op (Mohamed Ghannam)  [Orabug: 28020694]     {CVE-2018-5333}
    - wil6210: missing length check in wmi_set_ie (Lior David)  [Orabug: 28951267]  {CVE-2018-5848}
    - floppy: Do not copy a kernel pointer to user memory in FDGETPRM ioctl (Andy Whitcroft)  [Orabug:
    28956546]  {CVE-2018-7755} {CVE-2018-7755}
    - xfs: enhance dinode verifier (Eric Sandeen)  [Orabug: 28943579]  {CVE-2018-10322}
    - xfs: move inode fork verifiers to xfs_dinode_verify (Darrick J. Wong)  [Orabug: 28943579]     {CVE-2018-10322}
    - cdrom: fix improper type cast, which can leat to information leak. (Young_X)  [Orabug: 28929755]     {CVE-2018-16658} {CVE-2018-10940} {CVE-2018-18710}
    - bpf: 32-bit RSH verification must truncate input before the ALU op (Jann Horn)  [Orabug: 28861785]     {CVE-2018-18445}
    - scsi: sg: allocate with __GFP_ZERO in sg_build_indirect() (Alexander Potapenko)  [Orabug: 28884433]     {CVE-2018-1000204}
    - random: fix crng_ready() test (Theodore Ts'o)  [Orabug: 28863713]  {CVE-2018-1108} {CVE-2018-1108}
    - proc: do not access cmdline nor environ from file-backed areas (Willy Tarreau)  [Orabug: 28863722]     {CVE-2018-1120} {CVE-2018-1120}
    - vhost: correctly check the iova range when waking virtqueue (Jason Wang)  [Orabug: 28892623]     {CVE-2018-1118}
    - xfs: don't call xfs_da_shrink_inode with NULL bp (Eric Sandeen)  [Orabug: 28893785]  {CVE-2018-13094}
    - ALSA: rawmidi: Change resized buffers atomically (Takashi Iwai)  [Orabug: 28893798]  {CVE-2018-10902}

Tenable has extracted the preceding description block directly from the Oracle Linux 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 remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2019-4509 advisory.

    - KVM: X86: Fix scan ioapic use-before-initialization (Wanpeng Li)  [Orabug: 29026132]  {CVE-2018-19407}
    - ALSA: usb-audio: Fix UAF decrement if card has no live interfaces in card.c (Hui Peng)  [Orabug:
    29042979]  {CVE-2018-19824}
    - xfs: enhance dinode verifier (Eric Sandeen)  [Orabug: 28997653]  {CVE-2018-10322}
    - xfs: move inode fork verifiers to xfs_dinode_verify (Darrick J. Wong)  [Orabug: 28997653]     {CVE-2018-10322}
    - net: phy: mdio-bcm-unimac: fix potential NULL dereference in unimac_mdio_probe() (Wei Yongjun)  [Orabug:
    27677743]  {CVE-2018-8043}
    - wil6210: missing length check in wmi_set_ie (Lior David)  [Orabug: 28951264]  {CVE-2018-5848}
    - floppy: Do not copy a kernel pointer to user memory in FDGETPRM ioctl (Andy Whitcroft)   {CVE-2018-7755}     {CVE-2018-7755}

Tenable has extracted the preceding description block directly from the Oracle Linux 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 remote Ubuntu 16.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4579-1 advisory.

    Hadar Manor discovered that the DCCP protocol implementation in the Linux kernel improperly handled socket     reuse, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of     service (system crash) or possibly execute arbitrary code. (CVE-2020-16119)

    Wen Xu discovered that the XFS file system in the Linux kernel did not properly validate inode metadata in     some situations. An attacker could use this to construct a malicious XFS image that, when mounted, could     cause a denial of service (system crash). (CVE-2018-10322)

    Jay Shin discovered that the ext4 file system implementation in the Linux kernel did not properly handle     directory access with broken indexing, leading to an out-of-bounds read vulnerability. A local attacker     could use this to cause a denial of service (system crash). (CVE-2020-14314)

    It was discovered that a race condition existed in the hugetlb sysctl implementation in the Linux kernel.
    A privileged attacker could use this to cause a denial of service (system crash). (CVE-2020-25285)

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 Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-002756 advisory.

    The xfs_dinode_verify function in fs/xfs/libxfs/xfs_inode_buf.c in the Linux kernel through 4.16.3 allows     local users to cause a denial of service (xfs_ilock_attr_map_shared invalid pointer dereference) via a     crafted xfs image.

Tenable has extracted the preceding description block directly from the Unity 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.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
131845	EulerOS 2.0 SP2 : kernel (EulerOS-SA-2019-2353)	Nessus	Huawei Local Security Checks	2019/12/10	2024/4/5	critical
121967	Photon OS 2.0: Linux PHSA-2018-2.0-0073	Nessus	PhotonOS Local Security Checks	2019/2/7	2024/7/22	medium
118990	CentOS 7 : kernel (CESA-2018:3083)	Nessus	CentOS Local Security Checks	2018/11/16	2022/5/27	high
122699	EulerOS 2.0 SP5 : kernel (EulerOS-SA-2019-1076)	Nessus	Huawei Local Security Checks	2019/3/8	2021/1/6	high
119638	Oracle Linux 7 : Unbreakable Enterprise kernel (ELSA-2018-4304)	Nessus	Oracle Linux Local Security Checks	2018/12/13	2026/2/9	high
121201	Oracle Linux 7 : Unbreakable Enterprise kernel (ELSA-2019-4509)	Nessus	Oracle Linux Local Security Checks	2019/1/16	2026/2/9	high
141447	Ubuntu 16.04 LTS : Linux kernel vulnerabilities (USN-4579-1)	Nessus	Ubuntu Local Security Checks	2020/10/14	2024/8/29	high
286851	Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2026-002756)	Nessus	Unity Linux Local Security Checks	2026/1/15	2026/1/16	medium

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