Security update for the Linux Kernel

SUSE Security Update: Security update for the Linux Kernel
Announcement ID: SUSE-SU-2018:1374-1
Rating: important
References: #1087082 #1087845 #1089895 #1091755 #1092497 #1093215 #1094019 #985025
Affected Products:
  • SUSE Linux Enterprise Server 12-LTSS
  • SUSE Linux Enterprise Module for Public Cloud 12

  • An update that solves three vulnerabilities and has 5 fixes is now available.

    Description:



    The SUSE Linux Enterprise 12 GA LTSS kernel was updated to receive several
    security fixes.

    The following security bugs were fixed:

    - CVE-2018-3639: Information leaks using "Memory Disambiguation" feature
    in modern CPUs were mitigated, aka "Spectre Variant 4" (bnc#1087082).

    A new boot commandline option was introduced,
    "spec_store_bypass_disable", which can have following values:

    - auto: Kernel detects whether your CPU model contains an implementation
    of Speculative Store Bypass and picks the most appropriate mitigation.
    - on: disable Speculative Store Bypass
    - off: enable Speculative Store Bypass
    - prctl: Control Speculative Store Bypass per thread via prctl.
    Speculative Store Bypass is enabled for a process by default. The
    state of the control is inherited on fork.
    - seccomp: Same as "prctl" above, but all seccomp threads will disable
    SSB unless they explicitly opt out.

    The default is "seccomp", meaning programs need explicit opt-in into the
    mitigation.

    Status can be queried via the
    /sys/devices/system/cpu/vulnerabilities/spec_store_bypass file, containing:

    - "Vulnerable"
    - "Mitigation: Speculative Store Bypass disabled"
    - "Mitigation: Speculative Store Bypass disabled via prctl"
    - "Mitigation: Speculative Store Bypass disabled via prctl and seccomp"

    - CVE-2018-1000199: An address corruption flaw was discovered while
    modifying a h/w breakpoint via 'modify_user_hw_breakpoint' routine, an
    unprivileged user/process could use this flaw to crash the system kernel
    resulting in DoS OR to potentially escalate privileges on a the system.
    (bsc#1089895)
    - CVE-2018-10675: The do_get_mempolicy function in mm/mempolicy.c allowed
    local users to cause a denial of service (use-after-free) or possibly
    have unspecified other impact via crafted system calls (bnc#1091755).

    The following non-security bugs were fixed:

    - x86/bugs: Make sure that _TIF_SSBD does not end up in _TIF_ALLWORK_MASK
    (bsc#1093215).
    - x86/bugs: correctly force-disable IBRS on !SKL systems (bsc#1092497).
    - x86/cpu/intel: Introduce macros for Intel family numbers (bsc#985025).
    - x86/cpu/intel: Introduce macros for Intel family numbers (bsc985025).
    - x86/speculation: Remove Skylake C2 from Speculation Control microcode
    blacklist (bsc#1087845).

    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 Server 12-LTSS:
      zypper in -t patch SUSE-SLE-SERVER-12-2018-959=1
    • SUSE Linux Enterprise Module for Public Cloud 12:
      zypper in -t patch SUSE-SLE-Module-Public-Cloud-12-2018-959=1

    Package List:

    • SUSE Linux Enterprise Server 12-LTSS (ppc64le s390x x86_64):
      • kernel-default-3.12.61-52.133.1
      • kernel-default-base-3.12.61-52.133.1
      • kernel-default-base-debuginfo-3.12.61-52.133.1
      • kernel-default-debuginfo-3.12.61-52.133.1
      • kernel-default-debugsource-3.12.61-52.133.1
      • kernel-default-devel-3.12.61-52.133.1
      • kernel-syms-3.12.61-52.133.1
    • SUSE Linux Enterprise Server 12-LTSS (noarch):
      • kernel-devel-3.12.61-52.133.1
      • kernel-macros-3.12.61-52.133.1
      • kernel-source-3.12.61-52.133.1
    • SUSE Linux Enterprise Server 12-LTSS (x86_64):
      • kernel-xen-3.12.61-52.133.1
      • kernel-xen-base-3.12.61-52.133.1
      • kernel-xen-base-debuginfo-3.12.61-52.133.1
      • kernel-xen-debuginfo-3.12.61-52.133.1
      • kernel-xen-debugsource-3.12.61-52.133.1
      • kernel-xen-devel-3.12.61-52.133.1
      • kgraft-patch-3_12_61-52_133-default-1-1.5.1
      • kgraft-patch-3_12_61-52_133-xen-1-1.5.1
    • SUSE Linux Enterprise Server 12-LTSS (s390x):
      • kernel-default-man-3.12.61-52.133.1
    • SUSE Linux Enterprise Module for Public Cloud 12 (x86_64):
      • kernel-ec2-3.12.61-52.133.1
      • kernel-ec2-debuginfo-3.12.61-52.133.1
      • kernel-ec2-debugsource-3.12.61-52.133.1
      • kernel-ec2-devel-3.12.61-52.133.1
      • kernel-ec2-extra-3.12.61-52.133.1
      • kernel-ec2-extra-debuginfo-3.12.61-52.133.1

    References: