SUSE-SU-2026:20558-1: 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-2026:20558-1  
Release Date: 2026-03-02T10:01:23Z  
Rating: important  
References:

  * bsc#1253439

  
Cross-References:

  * CVE-2025-40186

  
CVSS scores:

  * CVE-2025-40186 ( 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-2025-40186 ( 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 one vulnerability can now be installed.

## Description:

This update for the SUSE Linux Enterprise kernel 6.12.0-160000.6.1 fixes one
security issue

The following security issue was fixed:

  * CVE-2025-40186: tcp: Don't call reqsk_fastopen_remove() in
    tcp_conn_request() (bsc#1253439).

## 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-6.2-332=1

## Package List:

  * SUSE Linux Micro 6.2 (x86_64)
    * kernel-livepatch-SLE16-RT_Update_1-debugsource-4-160000.1.1
    * kernel-livepatch-6_12_0-160000_6-rt-debuginfo-4-160000.1.1
    * kernel-livepatch-6_12_0-160000_6-rt-4-160000.1.1

## References:

  * https://www.suse.com/security/cve/CVE-2025-40186.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1253439

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