Security update for the Linux Kernel (Live Patch 3 for SLE 12 SP3)

SUSE Security Update: Security update for the Linux Kernel (Live Patch 3 for SLE 12 SP3)
Announcement ID: SUSE-SU-2018:1641-1
Rating: important
References: #1083125 #1085447 #1090368 #1090646 #1090869
Affected Products:
  • SUSE Linux Enterprise Live Patching 12-SP3

  • An update that solves four vulnerabilities and has one errata is now available.

    Description:

    This update for the Linux Kernel 4.4.82-6_9 fixes several issues.

    The following security issues were fixed:

    - CVE-2017-13166: An elevation of privilege vulnerability in the kernel
    v4l2 video driver was fixed. (bsc#1085447).
    - CVE-2018-8897: A statement in the System Programming Guide of the Intel
    64 and IA-32 Architectures Software Developer's Manual (SDM) was
    mishandled in the development of some or all operating-system kernels,
    resulting in unexpected behavior for #DB exceptions that are deferred by
    MOV SS or POP SS, as demonstrated by (for example) privilege escalation
    in Windows, macOS, some Xen configurations, or FreeBSD, or a Linux
    kernel crash. The MOV to SS and POP SS instructions inhibit interrupts
    (including NMIs), data breakpoints, and single step trap exceptions
    until the instruction boundary following the next instruction (SDM Vol.
    3A; section 6.8.3). (The inhibited data breakpoints are those on memory
    accessed by the MOV to SS or POP to SS instruction itself.) Note that
    debug exceptions are not inhibited by the interrupt enable (EFLAGS.IF)
    system flag (SDM Vol. 3A; section 2.3). If the instruction following the
    MOV to SS or POP to SS instruction is an instruction like SYSCALL,
    SYSENTER, INT 3, etc. that transfers control to the operating system at
    CPL is complete. OS kernels may not expect this order of events and may
    therefore experience unexpected behavior when it occurs (bsc#1090368).
    - CVE-2018-8781: The udl_fb_mmap function in drivers/gpu/drm/udl/udl_fb.c
    had an integer-overflow vulnerability allowing local users with access
    to the udldrmfb driver to obtain full read and write permissions on
    kernel physical pages, resulting in a code execution in kernel space
    (bsc#1090646).
    - bsc#1083125: Fixed kgraft: small race in reversion code
    - CVE-2018-1087: kernel KVM was vulnerable to a flaw in the way the Linux
    kernel's KVM hypervisor handled exceptions delivered after a stack
    switch operation via Mov SS or Pop SS instructions. During the stack
    switch operation, the processor did not deliver interrupts and
    exceptions, rather they are delivered once the first instruction after
    the stack switch is executed. An unprivileged KVM guest user could use
    this flaw to crash the guest or, potentially, escalate their privileges
    in the guest (bsc#1090869) before

    Patch Instructions:

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
    Alternatively you can run the command listed for your product:

    • SUSE Linux Enterprise Live Patching 12-SP3:
      zypper in -t patch SUSE-SLE-Live-Patching-12-SP3-2018-1102=1

    Package List:

    • SUSE Linux Enterprise Live Patching 12-SP3 (x86_64):
      • kgraft-patch-4_4_82-6_9-default-8-2.1
      • kgraft-patch-4_4_82-6_9-default-debuginfo-8-2.1

    References: