CVE-2026-101306

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.

CVSS 3.1

9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.3% chance of exploitation in the next 30 days; higher than 18% of CVEs (scores of 2026-10-25)

CWEs

CWE-273, CWE-281

Published

2026-10-15

Modified

2026-10-20

Record from

the NVD, synced 2026-10-21

Affected

• freebsd:freebsd

References

• https://security.freebsd.org/advisories/FreeBSD-SA-26:66.jail.asc

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