---
id: CVE-2026-4105
title: A flaw was found in systemd
summary: >-
  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 use…
severity: medium
cvss: 6.7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-284
published: '2026-03-13'
updated: '2026-08-21'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-4105'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:7299'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-4105'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2447262'
    label: secalert@redhat.com
  - url: 'https://github.com/systemd/systemd/security/advisories/GHSA-4h6x-r8vx-3862'
    label: secalert@redhat.com
tags:
  - nvd
epss: 0.00142
epssPercentile: 0.03851
ingestedAt: '2026-08-21T14:17:57.274Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.