# Security update for the Linux Kernel RT (Live Patch 13 for SLE 15 SP4)

Announcement ID: SUSE-SU-2023:4164-1  
Rating: important  
References:

  * bsc#1215440

  
Cross-References:

  * CVE-2023-4623

  
CVSS scores:

  * 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:

  * openSUSE Leap 15.5
  * SUSE Linux Enterprise High Performance Computing 15 SP4
  * SUSE Linux Enterprise High Performance Computing 15 SP5
  * SUSE Linux Enterprise Live Patching 15-SP4
  * SUSE Linux Enterprise Live Patching 15-SP5
  * SUSE Linux Enterprise Micro 5.3
  * SUSE Linux Enterprise Micro 5.4
  * SUSE Linux Enterprise Micro 5.5
  * SUSE Linux Enterprise Real Time 15 SP4
  * SUSE Linux Enterprise Real Time 15 SP5
  * SUSE Linux Enterprise Server 15 SP4
  * SUSE Linux Enterprise Server 15 SP5
  * SUSE Linux Enterprise Server for SAP Applications 15 SP4
  * SUSE Linux Enterprise Server for SAP Applications 15 SP5

  
  
An update that solves one vulnerability can now be installed.

## Description:

This update for the Linux Kernel 5.14.21-150400_15_53 fixes one issue.

The following security issue was fixed:

  * 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).

## 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-SP4-2023-4167=1

  * openSUSE Leap 15.5  
    zypper in -t patch SUSE-2023-4164=1

  * SUSE Linux Enterprise Live Patching 15-SP5  
    zypper in -t patch SUSE-SLE-Module-Live-Patching-15-SP5-2023-4164=1

## Package List:

  * SUSE Linux Enterprise Live Patching 15-SP4 (x86_64)
    * kernel-livepatch-5_14_21-150400_15_53-rt-debuginfo-2-150400.2.1
    * kernel-livepatch-SLE15-SP4-RT_Update_13-debugsource-2-150400.2.1
    * kernel-livepatch-5_14_21-150400_15_53-rt-2-150400.2.1
  * openSUSE Leap 15.5 (x86_64)
    * kernel-livepatch-SLE15-SP5-RT_Update_5-debugsource-2-150500.2.1
    * kernel-livepatch-5_14_21-150500_13_18-rt-2-150500.2.1
    * kernel-livepatch-5_14_21-150500_13_18-rt-debuginfo-2-150500.2.1
  * SUSE Linux Enterprise Live Patching 15-SP5 (x86_64)
    * kernel-livepatch-SLE15-SP5-RT_Update_5-debugsource-2-150500.2.1
    * kernel-livepatch-5_14_21-150500_13_18-rt-2-150500.2.1
    * kernel-livepatch-5_14_21-150500_13_18-rt-debuginfo-2-150500.2.1

## References:

  * https://www.suse.com/security/cve/CVE-2023-4623.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1215440