CVE-2026-101304 — Multiple jail filesystem root escapes

Description (CNA)

When fdescfs(4) was mounted in a jail with the "nodup" option, opening /dev/fd/N returned a descriptor that did not inherit FD_RESOLVE_BENEATH or the Capsicum capability rights of descriptor N. 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 (CNA)

Vendor / product	Versions
FreeBSD / FreeBSD	affected 15.1-RELEASE before p4; affected 15.0-RELEASE before p14; affected 14.5-RELEASE before p1; affected 14.4-RELEASE before p10

CWE

CWE-273

References

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

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.