SUSE-SU-2026:21636-1: important: Security update for the Linux Kernel

[SLE-UPDATES]

# Security update for the Linux Kernel

Announcement ID: SUSE-SU-2026:21636-1  
Release Date: 2026-05-12T10:32:52Z  
Rating: important  
References:

  * bsc#1264449
  * bsc#1264450

  
Cross-References:

  * CVE-2026-43284
  * CVE-2026-43500

  
CVSS scores:

  * CVE-2026-43284 ( SUSE ):  8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
  * CVE-2026-43284 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
  * CVE-2026-43284 ( NVD ):  8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
  * 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

  
Affected Products:

  * SUSE Linux Micro 6.1

  
  
An update that solves two vulnerabilities can now be installed.

## Description:

The SUSE Linux Enterprise Micro 6.0 and Micro 6.1 kernel was updated to fix the
following security issues:

  * CVE-2026-43284: xfrm: esp: avoid in-place decrypt on shared skb frags
    (bsc#1264449).
  * CVE-2026-43500: rxrpc: unshare DATA/RESPONSE packets when paged frags are
    present (bsc#1264450).

## 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 6.1  
    zypper in -t patch SUSE-SLE-Micro-6.1-kernel-400=1

## Package List:

  * SUSE Linux Micro 6.1 (aarch64 ppc64le x86_64)
    * kernel-default-base-6.4.0-43.1.21.20
  * SUSE Linux Micro 6.1 (noarch)
    * kernel-macros-6.4.0-43.1
    * kernel-devel-6.4.0-43.1
    * kernel-source-6.4.0-43.1
  * SUSE Linux Micro 6.1 (aarch64 ppc64le s390x x86_64 nosrc)
    * kernel-default-6.4.0-43.1
  * SUSE Linux Micro 6.1 (aarch64 ppc64le s390x x86_64)
    * kernel-default-debuginfo-6.4.0-43.1
    * kernel-default-devel-6.4.0-43.1
    * kernel-default-debugsource-6.4.0-43.1
  * SUSE Linux Micro 6.1 (ppc64le x86_64)
    * kernel-default-devel-debuginfo-6.4.0-43.1
  * SUSE Linux Micro 6.1 (s390x x86_64)
    * kernel-default-livepatch-6.4.0-43.1
  * SUSE Linux Micro 6.1 (nosrc x86_64)
    * kernel-kvmsmall-6.4.0-43.1
  * SUSE Linux Micro 6.1 (x86_64)
    * kernel-kvmsmall-debuginfo-6.4.0-43.1
    * kernel-kvmsmall-debugsource-6.4.0-43.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-43284.html
  * https://www.suse.com/security/cve/CVE-2026-43500.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1264449
  * https://bugzilla.suse.com/show_bug.cgi?id=1264450

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