CVSS 9.8 (critical) · published 2026-10-15
SCM_RIGHTS file descriptor passing did not preserve FD_RESOLVE_BENEATH when a descriptor was transferred. A process could clear the restriction by sending the descriptor to itself over a Unix domain socket. A process in a jail that has received a directory file descriptor from another jail can use these techniques to escape the jail's filesystem root restriction.
Affected products (NVD): freebsd freebsd
Weakness: CWE-273, CWE-281
Source: NVD CVE-2026-101306
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