SUSE-SU-2026:20471-1: important: Security update for the Linux Kernel RT (Live Patch 11 for SUSE Linux Enterprise Micro 6.0)

[SLE-UPDATES]

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

Announcement ID: SUSE-SU-2026:20471-1  
Release Date: 2026-02-19T09:19:41Z  
Rating: important  
References:

  * bsc#1249480
  * bsc#1253439
  * bsc#1253473

  
Cross-References:

  * CVE-2025-39742
  * CVE-2025-40129
  * CVE-2025-40186

  
CVSS scores:

  * CVE-2025-39742 ( 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-2025-39742 ( SUSE ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2025-39742 ( NVD ):  5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
  * CVE-2025-40129 ( SUSE ):  8.7
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  * CVE-2025-40129 ( SUSE ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * 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 6.0

  
  
An update that solves three vulnerabilities can now be installed.

## Description:

This update for the SUSE Linux Enterprise kernel 6.4.0-32.1 fixes various
security issues

The following security issues were fixed:

  * CVE-2025-39742: RDMA: hfi1: fix possible divide-by-zero in
    find_hw_thread_mask() (bsc#1249480).
  * CVE-2025-40129: sunrpc: fix null pointer dereference on zero-length checksum
    (bsc#1253473).
  * 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 6.0  
    zypper in -t patch SUSE-SLE-Micro-6.0-kernel-268=1

## Package List:

  * SUSE Linux Micro 6.0 (x86_64)
    * kernel-livepatch-6_4_0-35-rt-debuginfo-6-1.1
    * kernel-livepatch-MICRO-6-0-RT_Update_11-debugsource-6-1.1
    * kernel-livepatch-6_4_0-35-rt-6-1.1

## References:

  * https://www.suse.com/security/cve/CVE-2025-39742.html
  * https://www.suse.com/security/cve/CVE-2025-40129.html
  * https://www.suse.com/security/cve/CVE-2025-40186.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1249480
  * https://bugzilla.suse.com/show_bug.cgi?id=1253439
  * https://bugzilla.suse.com/show_bug.cgi?id=1253473

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