SUSE-SU-2023:3773-1: important: Security update for the Linux Kernel RT (Live Patch 9 for SLE 15 SP4)

[sle-security-updates at lists.suse.com]

# Security update for the Linux Kernel RT (Live Patch 9 for SLE 15 SP4)

Announcement ID: SUSE-SU-2023:3773-1  
Rating: important  
References:

  * #1213064
  * #1213587
  * #1214123
  * #1215119

  
Cross-References:

  * CVE-2023-31248
  * CVE-2023-3609
  * CVE-2023-3776
  * CVE-2023-4273

  
CVSS scores:

  * CVE-2023-31248 ( SUSE ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-31248 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-3609 ( SUSE ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-3609 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-3776 ( SUSE ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-3776 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-4273 ( SUSE ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-4273 ( NVD ):  6.0 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

  
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_40 fixes several issues.

The following security issues were fixed:

  * CVE-2023-3776: Fixed improper refcount update in cls_fw leads to use-after-
    free (bsc#1215119).
  * CVE-2023-4273: Fixed a flaw in the exFAT driver of the Linux kernel that
    alloawed a local privileged attacker to overflow the kernel stack
    (bsc#1214123).
  * CVE-2023-3609: Fixed reference counter leak leading to overflow in net/sched
    (bsc#1213587).
  * CVE-2023-31248: Fixed an use-after-free vulnerability in
    nft_chain_lookup_byid that could allow a local attacker to escalate their
    privilege (bsc#1213064).

## 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-SP4-2023-3773=1

## Package List:

  * SUSE Linux Enterprise Live Patching 15-SP4 (x86_64)
    * kernel-livepatch-SLE15-SP4-RT_Update_9-debugsource-3-150400.2.1
    * kernel-livepatch-5_14_21-150400_15_40-rt-debuginfo-3-150400.2.1
    * kernel-livepatch-5_14_21-150400_15_40-rt-3-150400.2.1

## References:

  * https://www.suse.com/security/cve/CVE-2023-31248.html
  * https://www.suse.com/security/cve/CVE-2023-3609.html
  * https://www.suse.com/security/cve/CVE-2023-3776.html
  * https://www.suse.com/security/cve/CVE-2023-4273.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1213064
  * https://bugzilla.suse.com/show_bug.cgi?id=1213587
  * https://bugzilla.suse.com/show_bug.cgi?id=1214123
  * https://bugzilla.suse.com/show_bug.cgi?id=1215119

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