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.

Score

CVSS 3.1 9.8 Critical

Status

Analyzed - secteam@freebsd.org

Published

2026-10-15

Last modified

2026-10-20

Weaknesses

CWE-273, CWE-281

Affected products

• Freebsd (Freebsd)

References

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