SUSE-SU-2026:21530-1: important: Security update for the Linux Kernel (Live Patch 6 for SUSE Linux Enterprise 16)

[SLE-SECURITY-UPDATES]

# Security update for the Linux Kernel (Live Patch 6 for SUSE Linux Enterprise
16)

Announcement ID: SUSE-SU-2026:21530-1  
Release Date: 2026-05-05T22:36:52Z  
Rating: important  
References:

  * bsc#1259126
  * bsc#1261630
  * bsc#1261845
  * bsc#1263689

  
Cross-References:

  * CVE-2026-23204
  * CVE-2026-23437
  * CVE-2026-31406
  * CVE-2026-31431

  
CVSS scores:

  * CVE-2026-23204 ( SUSE ):  6.8
    CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-23204 ( SUSE ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-23204 ( NVD ):  7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
  * CVE-2026-23204 ( NVD ):  7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
  * CVE-2026-23437 ( SUSE ):  7.3
    CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-23437 ( SUSE ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-23437 ( NVD ):  5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-23437 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-31406 ( SUSE ):  7.3
    CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-31406 ( SUSE ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-31406 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-31431 ( SUSE ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-31431 ( 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 Micro 6.2

  
  
An update that solves four vulnerabilities can now be installed.

## Description:

This update for the SUSE Linux Enterprise Kernel 6.12.0-160000.27.1 fixes
various security issues

The following security issues were fixed:

  * CVE-2026-23204: net/sched: cls_u32: use skb_header_pointer_careful()
    (bsc#1259126).
  * CVE-2026-23437: net: shaper: protect late read accesses to the hierarchy
    (bsc#1261845).
  * CVE-2026-31406: xfrm: Fix work re-schedule after cancel in
    xfrm_nat_keepalive_net_fini() (bsc#1261630).
  * CVE-2026-31431: crypto: algif_aead - Revert to operating out-of-place
    (bsc#1263689).

## 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 Micro 6.2  
    zypper in -t patch SUSE-SL-Micro-6.2-699=1

## Package List:

  * SUSE Linux Micro 6.2 (ppc64le s390x x86_64)
    * kernel-livepatch-6_12_0-160000_27-default-debuginfo-3-160000.1.1
    * kernel-livepatch-6_12_0-160000_27-default-3-160000.1.1
    * kernel-livepatch-SLE16_Update_6-debugsource-3-160000.1.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-23204.html
  * https://www.suse.com/security/cve/CVE-2026-23437.html
  * https://www.suse.com/security/cve/CVE-2026-31406.html
  * https://www.suse.com/security/cve/CVE-2026-31431.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1259126
  * https://bugzilla.suse.com/show_bug.cgi?id=1261630
  * https://bugzilla.suse.com/show_bug.cgi?id=1261845
  * https://bugzilla.suse.com/show_bug.cgi?id=1263689

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