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             AUSCERT External Security Bulletin Redistribution

    Security update for the Linux Kernel (Live Patch 16 for SLE 12 SP4)
                               18 March 2021


        AusCERT Security Bulletin Summary

Product:           linux kernel
Publisher:         SUSE
Operating System:  SUSE
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
                   Increased Privileges            -- Existing Account
                   Overwrite Arbitrary Files       -- Existing Account
                   Denial of Service               -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-3347 CVE-2020-29368 CVE-2020-28374

Reference:         ESB-2021.0955

Original Bulletin: 

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SUSE Security Update: Security update for the Linux Kernel (Live Patch 16 for
SLE 12 SP4)


Announcement ID:   SUSE-SU-2021:0823-1
Rating:            important
References:        #1178684 #1179616 #1179664 #1181553 #1182108 #1182468
Cross-References:  CVE-2020-27786 CVE-2020-28374 CVE-2020-29368 CVE-2021-3347
Affected Products:
                   SUSE Linux Enterprise Live Patching 12-SP4

An update that solves four vulnerabilities and has two fixes is now available.


This update for the Linux Kernel 4.12.14-95_60 fixes several issues.
The following security issues were fixed:

  o 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).
  o Fixed an issue where NFS client filesystems got unmounted on fail-over (bsc
  o Fixed an issue where NFS client hanged on write errors (bsc#1182108).
  o 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).
  o CVE-2020-27786: Fixed a potential user after free which could have led to
    memory corruption or privilege escalation (bsc#1179616).
  o 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:

  o SUSE Linux Enterprise Live Patching 12-SP4:
    zypper in -t patch SUSE-SLE-Live-Patching-12-SP4-2021-823=1

Package List:

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


  o https://www.suse.com/security/cve/CVE-2020-27786.html
  o https://www.suse.com/security/cve/CVE-2020-28374.html
  o https://www.suse.com/security/cve/CVE-2020-29368.html
  o https://www.suse.com/security/cve/CVE-2021-3347.html
  o https://bugzilla.suse.com/1178684
  o https://bugzilla.suse.com/1179616
  o https://bugzilla.suse.com/1179664
  o https://bugzilla.suse.com/1181553
  o https://bugzilla.suse.com/1182108
  o https://bugzilla.suse.com/1182468

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