Security update for the Linux Kernel (Live Patch 1 for SLE 15)

SUSE Security Update: Security update for the Linux Kernel (Live Patch 1 for SLE 15)
Announcement ID: SUSE-SU-2019:0740-1
Rating: important
References: #1124729 #1124734 #1126284 #1127757 #1128378
Cross-References:CVE-2018-12232 CVE-2019-6974 CVE-2019-7221 CVE-2019-8912 CVE-2019-9213
Affected Products:
  • SUSE Linux Enterprise Module for Live Patching 15

An update that fixes 5 vulnerabilities is now available.


This update for the Linux Kernel 4.12.14-25_3 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-2019-8912: af_alg_release() in crypto/af_alg.c neglected to set a NULL value for a certain structure member, which could have led to a use-after-free in sockfs_setattr (bsc#1126284).
  • CVE-2018-12232: In net/socket.c there was a race condition between fchownat and close in cases where they target the same socket file descriptor, related to the sock_close and sockfs_setattr functions. fchownat did not increment the file descriptor reference count, which allowed close to set the socket to NULL during fchownat's execution, leading to a NULL pointer dereference and system crash (bsc#1127757).
  • 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-2019-6974: kvm_ioctl_create_device in virt/kvm/kvm_main.c mishandled reference counting because of a race condition, leading to a use-after-free (bsc#1124729).

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 Module for Live Patching 15:
    zypper in -t patch SUSE-SLE-Module-Live-Patching-15-2019-740=1 SUSE-SLE-Module-Live-Patching-15-2019-746=1

Package List:

  • SUSE Linux Enterprise Module for Live Patching 15 (ppc64le x86_64):
    • kernel-livepatch-4_12_14-23-default-9-25.2
    • kernel-livepatch-4_12_14-23-default-debuginfo-9-25.2
    • kernel-livepatch-4_12_14-25_3-default-8-2.1
    • kernel-livepatch-4_12_14-25_3-default-debuginfo-8-2.1
    • kernel-livepatch-SLE15_Update_0-debugsource-9-25.2