# Security update for the Linux Kernel RT (Live Patch 3 for SLE 15 SP4)

Announcement ID: SUSE-SU-2023:4201-1  
Rating: important  
References:

  * bsc#1212934
  * bsc#1214812
  * bsc#1215118
  * bsc#1215440

  
Cross-References:

  * CVE-2023-3390
  * CVE-2023-4004
  * CVE-2023-4147
  * CVE-2023-4623

  
CVSS scores:

  * CVE-2023-3390 ( SUSE ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-3390 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-4004 ( SUSE ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-4004 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-4147 ( SUSE ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-4147 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-4623 ( SUSE ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-4623 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

  
Affected Products:

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

  
  
An update that solves four vulnerabilities can now be installed.

## Description:

This update for the Linux Kernel 5.14.21-150400_15_11 fixes several issues.

The following security issues were fixed:

  * CVE-2023-4147: Fixed use-after-free in nf_tables_newrule (bsc#1215118).
  * CVE-2023-4623: Fixed a use-after-free issue in the HFSC network scheduler
    which could be exploited to achieve local privilege escalation
    (bsc#1215440).
  * CVE-2023-4004: Fixed improper element removal netfilter nft_set_pipapo
    (bsc#1214812).
  * CVE-2023-3390: Fixed an use-after-free vulnerability in the netfilter
    subsystem in net/netfilter/nf_tables_api.c that could allow a local attacker
    with user access to cause a privilege escalation issue (bsc#1212934).

## Patch Instructions:

To install this SUSE 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 15-SP4  
    zypper in -t patch SUSE-SLE-Module-Live-Patching-15-SP4-2023-4201=1 SUSE-SLE-
Module-Live-Patching-15-SP4-2023-4202=1 SUSE-SLE-Module-Live-
Patching-15-SP4-2023-4203=1

## Package List:

  * SUSE Linux Enterprise Live Patching 15-SP4 (x86_64)
    * kernel-livepatch-SLE15-SP4-RT_Update_2-debugsource-10-150400.2.3
    * kernel-livepatch-5_14_21-150400_15_11-rt-9-150400.2.3
    * kernel-livepatch-SLE15-SP4-RT_Update_3-debugsource-9-150400.2.3
    * kernel-livepatch-5_14_21-150400_15_5-rt-11-150400.2.3
    * kernel-livepatch-5_14_21-150400_15_5-rt-debuginfo-11-150400.2.3
    * kernel-livepatch-5_14_21-150400_15_8-rt-debuginfo-10-150400.2.3
    * kernel-livepatch-5_14_21-150400_15_8-rt-10-150400.2.3
    * kernel-livepatch-SLE15-SP4-RT_Update_1-debugsource-11-150400.2.3
    * kernel-livepatch-5_14_21-150400_15_11-rt-debuginfo-9-150400.2.3

## References:

  * https://www.suse.com/security/cve/CVE-2023-3390.html
  * https://www.suse.com/security/cve/CVE-2023-4004.html
  * https://www.suse.com/security/cve/CVE-2023-4147.html
  * https://www.suse.com/security/cve/CVE-2023-4623.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1212934
  * https://bugzilla.suse.com/show_bug.cgi?id=1214812
  * https://bugzilla.suse.com/show_bug.cgi?id=1215118
  * https://bugzilla.suse.com/show_bug.cgi?id=1215440