CVE-2026-29111: Systemd Project Systemd

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

systemd, a system and service manager, (as PID 1) hits an assert and freezes execution when an unprivileged IPC API call is made with spurious data. On version v249 and older the effect is not an assert, but stack overwriting, with the attacker controlled content. From version v250 and newer this is not possible as the safety check causes an assert instead. This IPC call was added in v239, so versions older than that are not affected. Versions 260-rc1, 259.2, 258.5, and 257.11 contain patches. No known workarounds are available.

Affected products

• Systemd Project Systemd: from 239, before 257.11 (fixed in 257.11); from 258, before 258.5 (fixed in 258.5); from 259, before 259.2 (fixed in 259.2)

Published 2026-03-23. Last modified 2026-06-17.