CVE-2026-40223 Details
Description
In systemd 258 before 260, a local unprivileged user can trigger an assert when a Delegate=yes and User=<unset> unit exists and is running.
An assertion failure vulnerability has been identified in systemd versions 258 prior to 260. This issue allows a local unprivileged user to trigger an assert, causing the systemd process (PID 1) to freeze execution. The vulnerability occurs when a system unit is running with 'Delegate=yes' and no 'User=' specified. Under these conditions, an unprivileged IPC API call can be made, leading to the assertion failure.
Users can stop and disable any system units with 'Delegate=yes' and no 'User=' specified. systemd versions 260, 259.2 and 258.5 include the patch for this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 14, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/systemd/systemd/security/advisories/GHSA-x4h8-rrrg-q78f | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-696 | Incorrect Behavior Order | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| systemd project systemd | >= 258, < 260 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 27, 2026 | Initial Analysis | [email protected] |
| Apr 10, 2026 | New CVE Received | [email protected] |