SUSE-SU-2026:20781-1: important: Security update for the Linux Kernel (Live Patch 5 for SUSE Linux Enterprise Micro 6.0)

Tue Mar 24 16:32:33 UTC 2026

# Security update for the Linux Kernel (Live Patch 5 for SUSE Linux Enterprise
Micro 6.0)

Announcement ID: SUSE-SU-2026:20781-1  
Release Date: 2026-03-23T10:28:12Z  
Rating: important  
References:

  * bsc#1247240
  * bsc#1255053
  * bsc#1255895
  * bsc#1256624
  * bsc#1256644
  * bsc#1257118
  * bsc#1257629
  * bsc#1257669

Cross-References:

  * CVE-2025-21738
  * CVE-2025-38159
  * CVE-2025-38488
  * CVE-2025-40258
  * CVE-2025-40284
  * CVE-2025-40297
  * CVE-2025-68813
  * CVE-2025-71085

CVSS scores:

  * CVE-2025-21738 ( 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-2025-21738 ( SUSE ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2025-21738 ( NVD ):  5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
  * CVE-2025-38159 ( 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-2025-38159 ( SUSE ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2025-38159 ( NVD ):  7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
  * CVE-2025-38488 ( 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-2025-38488 ( SUSE ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2025-38488 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2025-40258 ( 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-2025-40258 ( SUSE ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2025-40284 ( 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-2025-40284 ( SUSE ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2025-40297 ( 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-2025-40297 ( SUSE ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2025-68813 ( 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-2025-68813 ( SUSE ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2025-71085 ( 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-2025-71085 ( SUSE ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Products:

  * SUSE Linux Micro 6.1

An update that solves eight vulnerabilities can now be installed.

## Description:

This update for the SUSE Linux Enterprise Kernel 6.4.0-25.1 fixes various
security issues

The following security issues were fixed:

  * CVE-2025-21738: ata: libata-sff: ensure that we cannot write outside the
    allocated buffer (bsc#1257118).
  * CVE-2025-38159: wifi: rtw88: fix the 'para' buffer size to avoid reading out
    of bounds (bsc#1257629).
  * CVE-2025-38488: smb: client: fix use-after-free in crypt_message when using
    async crypto (bsc#1247240).
  * CVE-2025-40258: mptcp: fix race condition in mptcp_schedule_work()
    (bsc#1255053).
  * CVE-2025-40284: Bluetooth: MGMT: cancel mesh send timer when hdev removed
    (bsc#1257669).
  * CVE-2025-40297: net: bridge: fix use-after-free due to MST port state bypass
    (bsc#1255895).
  * CVE-2025-68813: ipvs: fix ipv4 null-ptr-deref in route error path
    (bsc#1256644).
  * CVE-2025-71085: ipv6: BUG() in pskb_expand_head() as part of
    calipso_skbuff_setattr() (bsc#1256624).

## 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-SUSE_SLFO_Kernel_1.0_Build__patchinfo.20260319170256621910.216358544319405=1

## Package List:

  * SUSE Linux Micro 6.1 (s390x x86_64)
    * kernel-livepatch-6_4_0-25-default-17-1.2
    * kernel-livepatch-6_4_0-25-default-debuginfo-17-1.2
    * kernel-livepatch-MICRO-6-0_Update_5-debugsource-17-1.2

## References:

  * https://www.suse.com/security/cve/CVE-2025-21738.html
  * https://www.suse.com/security/cve/CVE-2025-38159.html
  * https://www.suse.com/security/cve/CVE-2025-38488.html
  * https://www.suse.com/security/cve/CVE-2025-40258.html
  * https://www.suse.com/security/cve/CVE-2025-40284.html
  * https://www.suse.com/security/cve/CVE-2025-40297.html
  * https://www.suse.com/security/cve/CVE-2025-68813.html
  * https://www.suse.com/security/cve/CVE-2025-71085.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1247240
  * https://bugzilla.suse.com/show_bug.cgi?id=1255053
  * https://bugzilla.suse.com/show_bug.cgi?id=1255895
  * https://bugzilla.suse.com/show_bug.cgi?id=1256624
  * https://bugzilla.suse.com/show_bug.cgi?id=1256644
  * https://bugzilla.suse.com/show_bug.cgi?id=1257118
  * https://bugzilla.suse.com/show_bug.cgi?id=1257629
  * https://bugzilla.suse.com/show_bug.cgi?id=1257669

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