SUSE-SU-2026:0991-1: important: Security update for systemd

[SLE-SECURITY-UPDATES]

# Security update for systemd

Announcement ID: SUSE-SU-2026:0991-1  
Release Date: 2026-03-24T07:23:04Z  
Rating: important  
References:

  * bsc#1259650
  * bsc#1259697

  
Cross-References:

  * CVE-2026-4105

  
CVSS scores:

  * CVE-2026-4105 ( 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-2026-4105 ( SUSE ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-4105 ( NVD ):  6.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

  
Affected Products:

  * SUSE Linux Enterprise High Performance Computing 12 SP5
  * SUSE Linux Enterprise Server 12 SP5
  * SUSE Linux Enterprise Server 12 SP5 LTSS
  * SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security
  * SUSE Linux Enterprise Server for SAP Applications 12 SP5

  
  
An update that solves one vulnerability and has one security fix can now be
installed.

## Description:

This update for systemd fixes the following issue:

  * CVE-2026-4105: privilege escalation due to improper access control in
    RegisterMachine D-Bus method (bsc#1259650).
  * udev: check for invalid chars in various fields received from the kernel
    (bsc#1259697).

Changelog:

cbf8ee66ee machined: reject invalid class types when registering machines
1a55ad48da udev: fix review mixup 1eba76668c udev-builtin-net-id: print cescaped
bad attributes cbd4b55380 udev: ensure tag parsing stays within bounds
5973d3b1cc udev: ensure there is space for trailing NUL before calling sprintf
f038eb6c8b udev: check for invalid chars in various fields received from the
kernel

## 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 Enterprise Server 12 SP5 LTSS  
    zypper in -t patch SUSE-SLE-SERVER-12-SP5-LTSS-2026-991=1

  * SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security  
    zypper in -t patch SUSE-SLE-SERVER-12-SP5-LTSS-EXTENDED-SECURITY-2026-991=1

## Package List:

  * SUSE Linux Enterprise Server 12 SP5 LTSS (aarch64 ppc64le s390x x86_64)
    * systemd-devel-228-157.75.1
    * udev-228-157.75.1
    * libudev-devel-228-157.75.1
    * udev-debuginfo-228-157.75.1
    * libudev1-debuginfo-228-157.75.1
    * systemd-sysvinit-228-157.75.1
    * libudev1-228-157.75.1
    * systemd-debugsource-228-157.75.1
    * libsystemd0-228-157.75.1
    * systemd-228-157.75.1
    * libsystemd0-debuginfo-228-157.75.1
    * systemd-debuginfo-228-157.75.1
  * SUSE Linux Enterprise Server 12 SP5 LTSS (noarch)
    * systemd-bash-completion-228-157.75.1
  * SUSE Linux Enterprise Server 12 SP5 LTSS (s390x x86_64)
    * libudev1-32bit-228-157.75.1
    * systemd-debuginfo-32bit-228-157.75.1
    * libsystemd0-debuginfo-32bit-228-157.75.1
    * systemd-32bit-228-157.75.1
    * libudev1-debuginfo-32bit-228-157.75.1
    * libsystemd0-32bit-228-157.75.1
  * SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security (x86_64)
    * systemd-devel-228-157.75.1
    * libudev1-32bit-228-157.75.1
    * udev-228-157.75.1
    * libudev-devel-228-157.75.1
    * udev-debuginfo-228-157.75.1
    * systemd-debuginfo-32bit-228-157.75.1
    * libudev1-debuginfo-228-157.75.1
    * systemd-sysvinit-228-157.75.1
    * systemd-32bit-228-157.75.1
    * libudev1-228-157.75.1
    * systemd-debugsource-228-157.75.1
    * libsystemd0-debuginfo-32bit-228-157.75.1
    * libsystemd0-228-157.75.1
    * systemd-228-157.75.1
    * libudev1-debuginfo-32bit-228-157.75.1
    * libsystemd0-debuginfo-228-157.75.1
    * systemd-debuginfo-228-157.75.1
    * libsystemd0-32bit-228-157.75.1
  * SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security (noarch)
    * systemd-bash-completion-228-157.75.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-4105.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1259650
  * https://bugzilla.suse.com/show_bug.cgi?id=1259697

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