Vulnerability 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.
Related Weaknesses (CWE)
References
FAQ
What is CVE-2026-45259?
CVE-2026-45259 is a documented vulnerability. 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 del...
How severe is CVE-2026-45259?
CVSS scoring is not yet available for CVE-2026-45259. Check NVD for updates.
Is there a patch for CVE-2026-45259?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.