SUSE-SU-2026:20261-1: 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-2026:20261-1  
Release Date: 2026-01-19T15:31:57Z  
Rating: important  
References:

  * bsc#1250192
  * bsc#1251787
  * bsc#1253437

  
Cross-References:

  * CVE-2023-53676
  * CVE-2025-39682
  * CVE-2025-40204

  
CVSS scores:

  * CVE-2023-53676 ( SUSE ):  8.5
    CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
  * CVE-2023-53676 ( SUSE ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-53676 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2025-39682 ( SUSE ):  7.0 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
  * CVE-2025-39682 ( NVD ):  7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
  * CVE-2025-40204 ( SUSE ):  8.7
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
  * CVE-2025-40204 ( SUSE ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

  
Affected Products:

  * SUSE Linux Micro 6.0

  
  
An update that solves three 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-2023-53676: scsi: target: iscsi: Fix buffer overflow in
    lio_target_nacl_info_show() (bsc#1251787).
  * CVE-2025-39682: tls: fix handling of zero-length records on the rx_list
    (bsc#1250192).
  * CVE-2025-40204: sctp: Fix MAC comparison to be constant-time (bsc#1253437).

## 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 6.0  
    zypper in -t patch SUSE-SLE-Micro-6.0-kernel-247=1

## Package List:

  * SUSE Linux Micro 6.0 (s390x x86_64)
    * kernel-livepatch-MICRO-6-0_Update_11-debugsource-4-1.1
    * kernel-livepatch-6_4_0-34-default-4-1.1
    * kernel-livepatch-6_4_0-34-default-debuginfo-4-1.1

## References:

  * https://www.suse.com/security/cve/CVE-2023-53676.html
  * https://www.suse.com/security/cve/CVE-2025-39682.html
  * https://www.suse.com/security/cve/CVE-2025-40204.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1250192
  * https://bugzilla.suse.com/show_bug.cgi?id=1251787
  * https://bugzilla.suse.com/show_bug.cgi?id=1253437

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