SUSE-SU-2026:20822-1: important: Security update for systemd

[SLE-SECURITY-UPDATES]

# Security update for systemd

Announcement ID: SUSE-SU-2026:20822-1  
Release Date: 2026-03-24T09:31:07Z  
Rating: important  
References:

  * bsc#1228081
  * bsc#1254293
  * bsc#1256427
  * bsc#1259418
  * bsc#1259650
  * bsc#1259697

  
Cross-References:

  * CVE-2026-29111
  * CVE-2026-4105

  
CVSS scores:

  * CVE-2026-29111 ( SUSE ):  6.8
    CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-29111 ( SUSE ):  5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-29111 ( NVD ):  5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
  * 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 Micro 6.0

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

## Description:

This update for systemd fixes the following issues:

Security issues:

  * CVE-2026-4105: privilege escalation due to improper access control in
    RegisterMachine D-Bus method (bsc#1259650).
  * CVE-2026-29111: local unprivileged user can trigger an assert in systemd
    (bsc#1259418).
  * udev: check for invalid chars in various fields received from the kernel
    (bsc#1259697).

Non security issues:

  * Name libsystemd-{shared,core} based on the major version of systemd and the
    package release number (bsc#1228081, bsc#1256427)
  * detect-virt: bare-metal GCE only for x86 and i386 (bsc#1254293)

Changelog:

  * a943e3ce2f machined: reject invalid class types when registering machines
  * 71593f77db udev: fix review mixup
  * 73a89810b4 udev-builtin-net-id: print cescaped bad attributes
  * 0f360bfdc0 udev-builtin-net_id: do not assume the current interface name is
    ethX
  * 40905232e2 udev: ensure tag parsing stays within bounds
  * 7bce9026e3 udev: ensure there is space for trailing NUL before calling
    sprintf
  * d018ac1ea3 udev: check for invalid chars in various fields received from the
    kernel
  * aef6e11921 core/cgroup: avoid one unnecessary strjoina()
  * cc7426f38a sd-json: fix off-by-one issue when updating parent for array
    elements
  * 26a748f727 core: validate input cgroup path more prudently
  * 99d8308fde core/dbus-manager: propagate meaningful dbus errors from
    EnqueueMarkedJobs
  * 8bbac1d508 detect-virt: bare-metal GCE only for x86 and i386

## 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-6.0-638=1

## Package List:

  * SUSE Linux Micro 6.0 (aarch64 s390x x86_64)
    * systemd-coredump-254.27-3.1
    * systemd-debugsource-254.27-3.1
    * systemd-portable-debuginfo-254.27-3.1
    * libsystemd0-254.27-3.1
    * systemd-254.27-3.1
    * systemd-coredump-debuginfo-254.27-3.1
    * libsystemd0-debuginfo-254.27-3.1
    * systemd-journal-remote-debuginfo-254.27-3.1
    * libudev1-debuginfo-254.27-3.1
    * systemd-container-254.27-3.1
    * systemd-container-debuginfo-254.27-3.1
    * systemd-experimental-debuginfo-254.27-3.1
    * udev-254.27-3.1
    * systemd-portable-254.27-3.1
    * udev-debuginfo-254.27-3.1
    * systemd-debuginfo-254.27-3.1
    * systemd-journal-remote-254.27-3.1
    * libudev1-254.27-3.1
    * systemd-experimental-254.27-3.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-29111.html
  * https://www.suse.com/security/cve/CVE-2026-4105.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1228081
  * https://bugzilla.suse.com/show_bug.cgi?id=1254293
  * https://bugzilla.suse.com/show_bug.cgi?id=1256427
  * https://bugzilla.suse.com/show_bug.cgi?id=1259418
  * https://bugzilla.suse.com/show_bug.cgi?id=1259650
  * https://bugzilla.suse.com/show_bug.cgi?id=1259697

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