SUSE Security Update: Security update for the Linux Kernel (Live Patch 13
 for SLE 12 SP4)
______________________________________________________________________________

Announcement ID:    SUSE-SU-2021:0826-1
Rating:             important
References:         #1178684 #1179616 #1179664 #1181553 #1182468 
                    
Cross-References:   CVE-2020-27786 CVE-2020-28374 CVE-2020-29368
                    CVE-2021-3347
CVSS scores:
                    CVE-2020-27786 (NVD) : 7.8
 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
                    CVE-2020-27786 (SUSE): 7.8
 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
                    CVE-2020-28374 (NVD) : 8.1
 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
                    CVE-2020-28374 (SUSE): 8.1
 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
                    CVE-2020-29368 (NVD) : 7
 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
                    CVE-2020-29368 (SUSE): 7
 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
                    CVE-2021-3347 (NVD) : 7.8
 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
                    CVE-2021-3347 (SUSE): 8.4
 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Products:
                    SUSE Linux Enterprise Live Patching 12-SP4
______________________________________________________________________________

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

Description:

   This update for the Linux Kernel 4.12.14-95_51 fixes several issues.

   The following security issues were fixed:

   - CVE-2020-29368: Fixed an issue in copy-on-write implementation which
     could have granted unintended write access because of a race condition
     in a THP mapcount check (bsc#1179664).
   - Fixed an issue where NFS client filesystems got unmounted on fail-over
     (bsc#1182468).
   - CVE-2021-3347: Fixed a use-after-free in the PI futexes during fault
     handling, allowing local users to execute code in the kernel
     (bsc#1181553).
   - CVE-2020-27786: Fixed a potential user after free which could have led
     to memory corruption or privilege escalation (bsc#1179616).
   - CVE-2020-28374: Fixed insufficient identifier checking in the LIO SCSI
     target code which could have been used by remote attackers to read or
     write files via directory traversal in an XCOPY request (bsc#1178684).


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-SP4:

      zypper in -t patch SUSE-SLE-Live-Patching-12-SP4-2021-826=1
 SUSE-SLE-Live-Patching-12-SP4-2021-827=1



Package List:

   - SUSE Linux Enterprise Live Patching 12-SP4 (ppc64le s390x x86_64):

      kgraft-patch-4_12_14-95_51-default-9-2.2

   - SUSE Linux Enterprise Live Patching 12-SP4 (ppc64le x86_64):

      kgraft-patch-4_12_14-95_48-default-10-2.2


References:

   https://www.suse.com/security/cve/CVE-2020-27786.html
   https://www.suse.com/security/cve/CVE-2020-28374.html
   https://www.suse.com/security/cve/CVE-2020-29368.html
   https://www.suse.com/security/cve/CVE-2021-3347.html
   https://bugzilla.suse.com/1178684
   https://bugzilla.suse.com/1179616
   https://bugzilla.suse.com/1179664
   https://bugzilla.suse.com/1181553
   https://bugzilla.suse.com/1182468