SUSE-SU-2026:21684-1: important: Security update for the Linux Kernel

[SLE-SECURITY-UPDATES]

# Security update for the Linux Kernel

Announcement ID: SUSE-SU-2026:21684-1  
Release Date: 2026-05-15T15:50:45Z  
Rating: important  
References:

  * bsc#1264013
  * bsc#1264450
  * bsc#1265209

  
Cross-References:

  * CVE-2025-54518
  * CVE-2026-43500
  * CVE-2026-46300

  
CVSS scores:

  * CVE-2025-54518 ( 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-2025-54518 ( SUSE ):  7.4 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
  * CVE-2025-54518 ( NVD ):  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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  * CVE-2026-43500 ( SUSE ):  8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
  * CVE-2026-43500 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-43500 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-46300 ( SUSE ):  8.6
    CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-46300 ( SUSE ):  8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

  
Affected Products:

  * SUSE Linux Micro 6.0

  
  
An update that solves three vulnerabilities can now be installed.

## Description:

The SUSE Linux Enterprise Micro 6.0 and Micro 6.1 RT kernel was updated to fix
various security issues

The following security issues were fixed:

  * CVE-2025-54518: x86/CPU/AMD: Prevent improper isolation of shared resources
    in Zen2's op cache (bsc#1264013).
  * CVE-2026-46300: net: skbuff: propagate shared-frag marker through
    pskb_copy() (bsc#1265209).
  * CVE-2026-43500: rxrpc: unshare DATA/RESPONSE packets when paged frags are
    present (bsc#1264450).

The following non security issues were fixed:

  * config: s390x/ppc64le: disable unsupported CONFIG_AFS_FS and CONFIG_AF_RXRPC
    (bsc#1264450).
  * io-wq: check that the predecessor is hashed in io_wq_remove_pending() (git-
    fixes).

## Special Instructions and Notes:

  * Please reboot the system after installing this update.

## 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-427=1

## Package List:

  * SUSE Linux Micro 6.0 (noarch)
    * kernel-source-rt-6.4.0-45.1
    * kernel-devel-rt-6.4.0-45.1
  * SUSE Linux Micro 6.0 (nosrc x86_64)
    * kernel-rt-6.4.0-45.1
  * SUSE Linux Micro 6.0 (x86_64)
    * kernel-rt-debugsource-6.4.0-45.1
    * kernel-rt-livepatch-6.4.0-45.1
    * kernel-rt-debuginfo-6.4.0-45.1

## References:

  * https://www.suse.com/security/cve/CVE-2025-54518.html
  * https://www.suse.com/security/cve/CVE-2026-43500.html
  * https://www.suse.com/security/cve/CVE-2026-46300.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1264013
  * https://bugzilla.suse.com/show_bug.cgi?id=1264450
  * https://bugzilla.suse.com/show_bug.cgi?id=1265209

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