6.5

CVE-2026-45259

sigqueue(2) missing capability mode restriction

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Freebsd ≫ Freebsd Version 14.3 Update -
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Freebsd ≫ Freebsd Version 15.0 Update -
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VulnDex Vulnerability Enrichment
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.09% 0.007
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
CISA-ADP 6.5 2 4
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
CWE-266 Incorrect Privilege Assignment

A product incorrectly assigns a privilege to a particular actor, creating an unintended sphere of control for that actor.

https://security.freebsd.org/advisories/FreeBSD-SA-26:28.capsicum.asc
Vendor Advisory