SUSE-SU-2026:1266-1: important: Security update for the Linux Kernel (Live Patch 20 for SUSE Linux Enterprise 15 SP6)

[SLE-UPDATES]

# Security update for the Linux Kernel (Live Patch 20 for SUSE Linux Enterprise
15 SP6)

Announcement ID: SUSE-SU-2026:1266-1  
Release Date: 2026-04-11T11:04:41Z  
Rating: important  
References:

  * bsc#1258051
  * bsc#1258183
  * bsc#1258784
  * bsc#1259896
  * bsc#1259962

  
Cross-References:

  * CVE-2026-23074
  * CVE-2026-23111
  * CVE-2026-23209

  
CVSS scores:

  * CVE-2026-23074 ( 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-2026-23074 ( SUSE ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-23074 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-23074 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-23111 ( 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-2026-23111 ( SUSE ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-23111 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-23111 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-23209 ( 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-2026-23209 ( SUSE ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-23209 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-23209 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

  
Affected Products:

  * openSUSE Leap 15.6
  * SUSE Linux Enterprise Live Patching 15-SP6
  * SUSE Linux Enterprise Real Time 15 SP6
  * SUSE Linux Enterprise Server 15 SP6
  * SUSE Linux Enterprise Server for SAP Applications 15 SP6

  
  
An update that solves three vulnerabilities and has two security fixes can now
be installed.

## Description:

This update for the SUSE Linux Enterprise Kernel 6.4.0-150600.23.87 fixes
various security issues

The following security issues were fixed:

  * CVE-2026-23074: net/sched: Enforce that teql can only be used as root qdisc
    (bsc#1258051).
  * CVE-2026-23111: netfilter: nf_tables: fix inverted genmask check in
    nft_map_catchall_activate() (bsc#1258183).
  * CVE-2026-23209: macvlan: fix error recovery in macvlan_common_newlink()
    (bsc#1258784).

The following non security issue was fixed:

  * Fix NULL pointer dereference in smb2_query_server_interfaces Livepatch for
    to restore a null check of server->ops->query_server_interfaces that was
    dropped by mistake. (bsc#1259896 bsc#1259962).

## 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:

  * openSUSE Leap 15.6  
    zypper in -t patch SUSE-2026-1266=1

  * SUSE Linux Enterprise Live Patching 15-SP6  
    zypper in -t patch SUSE-SLE-Module-Live-Patching-15-SP6-2026-1266=1

## Package List:

  * openSUSE Leap 15.6 (ppc64le s390x x86_64)
    * kernel-livepatch-6_4_0-150600_23_87-default-2-150600.2.1
    * kernel-livepatch-SLE15-SP6_Update_20-debugsource-2-150600.2.1
    * kernel-livepatch-6_4_0-150600_23_87-default-debuginfo-2-150600.2.1
  * SUSE Linux Enterprise Live Patching 15-SP6 (ppc64le s390x x86_64)
    * kernel-livepatch-6_4_0-150600_23_87-default-2-150600.2.1
    * kernel-livepatch-SLE15-SP6_Update_20-debugsource-2-150600.2.1
    * kernel-livepatch-6_4_0-150600_23_87-default-debuginfo-2-150600.2.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-23074.html
  * https://www.suse.com/security/cve/CVE-2026-23111.html
  * https://www.suse.com/security/cve/CVE-2026-23209.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1258051
  * https://bugzilla.suse.com/show_bug.cgi?id=1258183
  * https://bugzilla.suse.com/show_bug.cgi?id=1258784
  * https://bugzilla.suse.com/show_bug.cgi?id=1259896
  * https://bugzilla.suse.com/show_bug.cgi?id=1259962

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