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CVE-2026-29111

5.5 · MEDIUM

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.

Published Mar 23, 2026CWE-269EPSS 0.17%

Overview

CVE-2026-29111 is a medium-severity vulnerability. It was published on March 23, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/systemd/systemd/commit/1d22f706bd04f45f8422e17fbde3f56ece17758aGitHubgithub.com/systemd/systemd/commit/20021e7686426052e3a7505425d7e12085feb2a6GitHubgithub.com/systemd/systemd/commit/21167006574d6b83813c7596759b474f56562412GitHubgithub.com/systemd/systemd/commit/3cee294fe8cf4fa0eff933ab21416d099942cabdGitHubgithub.com/systemd/systemd/commit/42aee39107fbdd7db1ccd402a2151822b2805e9fGitHubgithub.com/systemd/systemd/commit/54588d2dedff54bfb6036670820650e4ea74628fGitHubgithub.com/systemd/systemd/commit/7ac3220213690e8a8d6d2a6e81e43bd1dce01d69GitHubgithub.com/systemd/systemd/commit/80acea4ef80a4bb78560ed970c34952299b890d6GitHubgithub.com/systemd/systemd/commit/b5fd14693057e5f2c9b4a49603be64ec3608ff6cGitHubgithub.com/systemd/systemd/commit/efa6ba2ab625aaa160ac435a09e6482fc63bdbe8

How CyberStrike helps

Frequently asked questions

What is CVE-2026-29111?

CVE-2026-29111 is a medium-severity vulnerability. It was published on March 23, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-29111?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-29111?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-29111?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-29111 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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