CVE-2026-4105 - systemd/systemd
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.
CVSS 6.7 (MEDIUM)
Evidence
- Host class excluded from user registration at both check points
- Targeted tests green post-merge
- Adversarial review passed
History
- 2026-10-28: fork-fixed - Merged to fork main