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             AUSCERT External Security Bulletin Redistribution

   Security update for the Linux Kernel RT (Live Patch 2 for SLE 15 SP4)
                               29 June 2023


        AusCERT Security Bulletin Summary

Product:           Linux Kernel RT (Live Patch 2 for SLE 15 SP4)
Publisher:         SUSE
Operating System:  SUSE
Resolution:        Patch/Upgrade
CVE Names:         CVE-2023-31436 CVE-2023-28466 CVE-2023-23455

Original Bulletin: 

Comment: CVSS (Max):  7.8 CVE-2023-28466 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
         CVSS Source: SUSE
         Calculator:  https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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Security update for the Linux Kernel RT (Live Patch 2 for SLE 15 SP4)

Announcement ID:  SUSE-SU-2023:2680-1
     Rating:      important
                    o #1207189
   References:      o #1210452
                    o #1210989

                    o CVE-2023-23455
Cross-References:   o CVE-2023-28466
                    o CVE-2023-31436

                    o CVE-2023-23455 ( SUSE ): 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N
                    o CVE-2023-23455 ( NVD ): 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/
                    o CVE-2023-28466 ( SUSE ): 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N
  CVSS scores:      o CVE-2023-28466 ( NVD ): 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/
                    o CVE-2023-31436 ( SUSE ): 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N
                    o CVE-2023-31436 ( NVD ): 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/

                    o SUSE Linux Enterprise High Performance Computing 15 SP4
                    o SUSE Linux Enterprise Live Patching 15-SP4
    Affected        o SUSE Linux Enterprise Micro 5.3
    Products:       o SUSE Linux Enterprise Micro 5.4
                    o SUSE Linux Enterprise Real Time 15 SP4
                    o SUSE Linux Enterprise Server 15 SP4
                    o SUSE Linux Enterprise Server for SAP Applications 15 SP4

An update that solves three vulnerabilities can now be installed.


This update for the Linux Kernel 5.14.21-150400_15_8 fixes several issues.

The following security issues were fixed:

  o CVE-2023-23455: Fixed a denial of service inside atm_tc_enqueue in net/
    sched/sch_atm.c because of type confusion (non-negative numbers can
    sometimes indicate a TC_ACT_SHOT condition rather than valid classification
    results) (bsc#1207189).
  o CVE-2023-31436: Fixed an out-of-bounds write in qfq_change_class() because
    lmax can exceed QFQ_MIN_LMAX (bsc#1210989).
  o CVE-2023-28466: Fixed race condition that could lead to use-after-free or
    NULL pointer dereference in do_tls_getsockopt in net/tls/tls_main.c (bsc#

Patch Instructions:

To install this SUSE Important 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 15-SP4
    zypper in -t patch SUSE-SLE-Module-Live-Patching-15-SP4-2023-2680=1

Package List:

  o SUSE Linux Enterprise Live Patching 15-SP4 (x86_64)


  o https://www.suse.com/security/cve/CVE-2023-23455.html
  o https://www.suse.com/security/cve/CVE-2023-28466.html
  o https://www.suse.com/security/cve/CVE-2023-31436.html
  o https://bugzilla.suse.com/show_bug.cgiid=1207189
  o https://bugzilla.suse.com/show_bug.cgiid=1210452
  o https://bugzilla.suse.com/show_bug.cgiid=1210989

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