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Medium severity6.5NVD Advisory· Published Jun 27, 2026· Updated Jul 1, 2026

CVE-2026-45259

CVE-2026-45259

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.

Affected products

32
  • FreeBSD/FreeBSD32 versions
    cpe:2.3:o:freebsd:freebsd:14.3:-:*:*:*:*:*:*+ 31 more
    • cpe:2.3:o:freebsd:freebsd:14.3:-:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p1:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p10:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p11:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p12:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p13:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p14:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p2:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p3:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p4:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p5:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p6:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p7:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p8:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p9:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.4:-:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.4:p1:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.4:p2:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.4:p3:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.4:p4:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.4:p5:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:-:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:p1:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:p2:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:p3:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:p4:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:p5:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:p6:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:p7:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:p8:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:p9:*:*:*:*:*:*
    • (no CPE)

Patches

Vulnerability mechanics

References

1

News mentions

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