SUSE-SU-2026:21499-1: important: Security update for the Linux Kernel (Live Patch 11 for SUSE Linux Enterprise Micro 6.0)

[SLE-SECURITY-UPDATES]

# Security update for the Linux Kernel (Live Patch 11 for SUSE Linux Enterprise
Micro 6.0)

Announcement ID: SUSE-SU-2026:21499-1  
Release Date: 2026-05-05T13:11:23Z  
Rating: important  
References:

  * bsc#1252048
  * bsc#1258005
  * bsc#1258655
  * bsc#1259126
  * bsc#1263689

  
Cross-References:

  * CVE-2025-39977
  * CVE-2025-71066
  * CVE-2026-23004
  * CVE-2026-23204
  * CVE-2026-31431

  
CVSS scores:

  * CVE-2025-39977 ( 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-2025-39977 ( SUSE ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2025-71066 ( SUSE ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-23004 ( 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-2026-23004 ( SUSE ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-23004 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-23004 ( NVD ):  4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
  * 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-2026-31431 ( 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 6.1

  
  
An update that solves five vulnerabilities can now be installed.

## Description:

This update for the SUSE Linux Enterprise Kernel 6.4.0-34.1 fixes various
security issues

The following security issues were fixed:

  * CVE-2025-39977: futex: Prevent use-after-free during requeue-PI
    (bsc#1252048).
  * CVE-2025-71066: net/sched: ets: Always remove class from active list before
    deleting in ets_qdisc_change (bsc#1258005).
  * CVE-2026-23004: dst: fix races in rt6_uncached_list_del() and
    rt_del_uncached_list() (bsc#1258655).
  * CVE-2026-23204: net/sched: cls_u32: use skb_header_pointer_careful()
    (bsc#1259126).
  * 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 6.1  
    zypper in -t patch SUSE-SLE-Micro-6.1-kernel-389=1

## Package List:

  * SUSE Linux Micro 6.1 (s390x x86_64)
    * kernel-livepatch-6_4_0-34-default-debuginfo-9-1.1
    * kernel-livepatch-MICRO-6-0_Update_11-debugsource-9-1.1
    * kernel-livepatch-6_4_0-34-default-9-1.1

## References:

  * https://www.suse.com/security/cve/CVE-2025-39977.html
  * https://www.suse.com/security/cve/CVE-2025-71066.html
  * https://www.suse.com/security/cve/CVE-2026-23004.html
  * https://www.suse.com/security/cve/CVE-2026-23204.html
  * https://www.suse.com/security/cve/CVE-2026-31431.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1252048
  * https://bugzilla.suse.com/show_bug.cgi?id=1258005
  * https://bugzilla.suse.com/show_bug.cgi?id=1258655
  * https://bugzilla.suse.com/show_bug.cgi?id=1259126
  * https://bugzilla.suse.com/show_bug.cgi?id=1263689

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