SUSE-SU-2026:20168-1: important: Security update for the Linux Kernel RT (Live Patch 1 for SUSE Linux Enterprise 16)

[SLE-SECURITY-UPDATES]

# Security update for the Linux Kernel RT (Live Patch 1 for SUSE Linux
Enterprise 16)

Announcement ID: SUSE-SU-2026:20168-1  
Release Date: 2026-01-26T11:03:44Z  
Rating: important  
References:

  * bsc#1251982
  * bsc#1253437
  * bsc#1254196

  
Cross-References:

  * CVE-2025-39963
  * CVE-2025-40204
  * CVE-2025-40212

  
CVSS scores:

  * CVE-2025-39963 ( 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-2025-39963 ( SUSE ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/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
  * CVE-2025-40212 ( 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-2025-40212 ( SUSE ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

  
Affected Products:

  * SUSE Linux Micro 6.2

  
  
An update that solves three vulnerabilities can now be installed.

## Description:

This update for the SUSE Linux Enterprise kernel 6.12.0-160000.6.1 fixes various
security issues

The following security issues were fixed:

  * CVE-2025-39963: io_uring: fix incorrect io_kiocb reference in io_link_skb
    (bsc#1251982).
  * CVE-2025-40204: sctp: Fix MAC comparison to be constant-time (bsc#1253437).
  * CVE-2025-40212: nfsd: fix refcount leak in nfsd_set_fh_dentry()
    (bsc#1254196).

## 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-6.2-195=1

## Package List:

  * SUSE Linux Micro 6.2 (x86_64)
    * kernel-livepatch-SLE16-RT_Update_1-debugsource-3-160000.1.1
    * kernel-livepatch-6_12_0-160000_6-rt-3-160000.1.1
    * kernel-livepatch-6_12_0-160000_6-rt-debuginfo-3-160000.1.1

## References:

  * https://www.suse.com/security/cve/CVE-2025-39963.html
  * https://www.suse.com/security/cve/CVE-2025-40204.html
  * https://www.suse.com/security/cve/CVE-2025-40212.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1251982
  * https://bugzilla.suse.com/show_bug.cgi?id=1253437
  * https://bugzilla.suse.com/show_bug.cgi?id=1254196

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