CVE-2026-45259
sigqueue(2) missing capability mode restriction
- State
- Published
- Severity
- 6.5 Medium
- Published
- Jun 27, 2026
- Updated
- Jun 29, 2026
- Reserved
- May 11, 2026
Description
sigqueue(2) was marked as permitted in capability mode with the introduction of Capsicum in 2011, but the implementation of kern_sigqueue did not include a capability mode check restricting signal delivery to the calling process's own PID.
A process in capability mode can use sigqueue(2) to send signals to any process it could signal following standard Unix permissions, bypassing the Capsicum sandbox restriction. A compromised sandboxed process could interfere with other processes, for example by sending SIGKILL or SIGSTOP. This could be any process running as the same user, or any process, for a superuser sandboxed process.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.5 Medium | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H | CISA-ADP |
Weaknesses
- CWE-266 Incorrect Privilege Assignment
Affected Products
| Product | Versions |
|---|---|
FreeBSDFreeBSD |
|
References
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