SUSE-SU-2026:23774-1: important: Security update for the Linux Kernel RT (Live Patch 25 for SUSE Linux Enterprise Micro 6.0)

[SLE-SECURITY-UPDATES]

# Security update for the Linux Kernel RT (Live Patch 25 for SUSE Linux
Enterprise Micro 6.0)

Announcement ID: SUSE-SU-2026:23774-1  
Release Date: 2026-09-14T08:55:42Z  
Rating: important  
References:

  * bsc#1273232
  * bsc#1274074
  * bsc#1274942
  * bsc#1275458

  
Cross-References:

  * CVE-2026-64423
  * CVE-2026-64561
  * CVE-2026-64564
  * CVE-2026-68138

  
CVSS scores:

  * CVE-2026-64423 ( SUSE ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-64423 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-64561 ( SUSE ):  9.3
    CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
  * CVE-2026-64561 ( SUSE ):  8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
  * CVE-2026-64561 ( NVD ):  8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
  * CVE-2026-64564 ( 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-2026-64564 ( SUSE ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-64564 ( NVD ):  9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-68138 ( 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-2026-68138 ( SUSE ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-68138 ( 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 four vulnerabilities can now be installed.

## Description:

This update for the SUSE Linux Enterprise Kernel 6.4.0-48.1 fixes various
security issues:

The following security issues were fixed:

  * CVE-2026-64423: ipv4: igmp: remove multicast group from hash table on device
    destruction (bsc#1275458).
  * CVE-2026-64561: KVM: x86: Check for invalid/obsolete root _after_ making MMU
    pages available (Zapscape) (bsc#1273232).
  * CVE-2026-64564: sctp: don't free the ASCONF's own transport in DEL-IP
    processing (SCTPhantom) (bsc#1274074).
  * CVE-2026-68138: net/sched: serialize qdisc_rtab_list against concurrent
    get/put (bsc#1274942).

## 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-623

## Package List:

  * SUSE Linux Micro 6.1 (x86_64)
    * kernel-livepatch-MICRO-6-0-RT_Update_25-debugsource-4-1.1
    * kernel-livepatch-6_4_0-48-rt-4-1.1
    * kernel-livepatch-6_4_0-48-rt-debuginfo-4-1.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-64423.html
  * https://www.suse.com/security/cve/CVE-2026-64561.html
  * https://www.suse.com/security/cve/CVE-2026-64564.html
  * https://www.suse.com/security/cve/CVE-2026-68138.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1273232
  * https://bugzilla.suse.com/show_bug.cgi?id=1274074
  * https://bugzilla.suse.com/show_bug.cgi?id=1274942
  * https://bugzilla.suse.com/show_bug.cgi?id=1275458

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