# CVE-2026-4105: Systemd: systemd: privilege escalation via improper access control in registermachine d-bus method

CVE-2026-4105 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-4105, released March 13, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-4105
- Priority: Routine
- CVSS: 6.7 (Moderate)
- EPSS: 0.0015
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 13, 2026
- Weakness: Improper Access Control
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-4105

## Description

A flaw was found in systemd. The systemd-machined service contains an Improper Access Control vulnerability due to insufficient validation of the class parameter in the RegisterMachine D-Bus (Desktop Bus) method. A local unprivileged user can exploit this by attempting to register a machine with a specific class value, which may leave behind a usable, attacker-controlled machine object. This allows the attacker to invoke methods on the privileged object, leading to the execution of arbitrary commands with root privileges on the host system.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | systemd Debian 12.15 (bookworm) | 252.39-1~deb12u2 | [DEBIAN-CVE-2026-4105](https://patchblox.com/security/data/fix/linux/debian-cve-2026-4105.md) | Mar 13, 2026 |
| Linux | systemd Debian 13.5 (trixie) | 257.13-1~deb13u1 | [DEBIAN-CVE-2026-4105](https://patchblox.com/security/data/fix/linux/debian-cve-2026-4105.md) | Mar 13, 2026 |
| Linux | systemd Debian 14 | 260~rc3-1 | [DEBIAN-CVE-2026-4105](https://patchblox.com/security/data/fix/linux/debian-cve-2026-4105.md) | Mar 13, 2026 |
| Linux | systemd opensuse-leap 15.6 | 254.27-150600.4.62.1 | [SUSE-SU-2026:1040-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1040-1.md) | Mar 25, 2026 |
| Linux | systemd opensuse-leap 16.0 | 257.13-160000.4.1 | [OPENSUSE-SU-2026:21754-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21754-1.md) | Sep 3, 2026 |
| Linux | systemd sles 15.6 | 254.27-150600.4.62.1 | [SUSE-SU-2026:1040-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1040-1.md) | Mar 25, 2026 |
| Linux | systemd sles 15.7 | 254.27-150600.4.62.1 | [SUSE-SU-2026:1040-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1040-1.md) | Mar 25, 2026 |
| Linux | systemd sles 16.0 | 257.13-160000.4.1 | [SUSE-SU-2026:23620-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23620-1.md) | Sep 3, 2026 |
| Linux | systemd-mini opensuse-leap 16.0 | 257.13-160000.4.1 | [OPENSUSE-SU-2026:21754-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21754-1.md) | Sep 3, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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