Security update for the Linux Kernel (Live Patch 33 for SLE 12)

SUSE Security Update: Security update for the Linux Kernel (Live Patch 33 for SLE 12)
Announcement ID: SUSE-SU-2019:0645-1
Rating: important
References: #1103098 #1124734 #1128378
Cross-References: CVE-2018-5391 CVE-2019-7221 CVE-2019-9213
Affected Products:
  • SUSE Linux Enterprise Server 12-LTSS

An update that fixes three vulnerabilities is now available.

Description:

This update for the Linux Kernel 3.12.61-52_125 fixes several issues.
The following security issues were fixed:

  • CVE-2019-9213: Expand_downwards in mm/mmap.c lacked a check for the mmap minimum address, which made it easier for attackers to exploit kernel NULL pointer dereferences on non-SMAP platforms. This is related to a capability check for the wrong task (bsc#1128378).
  • CVE-2019-7221: Fixed a user-after-free vulnerability in the KVM hypervisor related to the emulation of a preemption timer, allowing an guest user/process to crash the host kernel. (bsc#1124734).
  • CVE-2018-5391: The Linux kernel was vulnerable to a denial of service attack with low rates of specially modified packets targeting IP fragment re-assembly. An attacker might have caused a denial of service condition by sending specially crafted IP fragments. Various vulnerabilities in IP fragmentation have been discovered and fixed over the years. The current vulnerability (CVE-2018-5391) became exploitable in the Linux kernel with the increase of the IP fragment reassembly queue size (bsc#1103098).

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-12-2019-645=1 SUSE-SLE-SERVER-12-2019-646=1 SUSE-SLE-SERVER-12-2019-647=1 SUSE-SLE-SERVER-12-2019-648=1 SUSE-SLE-SERVER-12-2019-649=1 SUSE-SLE-SERVER-12-2019-650=1

Package List:

  • SUSE Linux Enterprise Server 12-LTSS (x86_64):
    • kgraft-patch-3_12_61-52_125-default-12-2.1
    • kgraft-patch-3_12_61-52_125-xen-12-2.1
    • kgraft-patch-3_12_61-52_128-default-10-2.1
    • kgraft-patch-3_12_61-52_128-xen-10-2.1
    • kgraft-patch-3_12_61-52_133-default-9-2.1
    • kgraft-patch-3_12_61-52_133-xen-9-2.1
    • kgraft-patch-3_12_61-52_136-default-9-2.1
    • kgraft-patch-3_12_61-52_136-xen-9-2.1
    • kgraft-patch-3_12_61-52_141-default-8-2.1
    • kgraft-patch-3_12_61-52_141-xen-8-2.1
    • kgraft-patch-3_12_61-52_146-default-6-2.1
    • kgraft-patch-3_12_61-52_146-xen-6-2.1

References: