CVE-2026-101306

Multiple jail filesystem root escapes

State: Published
Severity: 9.8 Critical
Published: Oct 15, 2026
Updated: Oct 16, 2026
Reserved: Sep 28, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CISA-ADP

Weaknesses

CWE-273 Improper Check for Dropped Privileges
CWE-281 Improper Preservation of Permissions

Affected Products

Product	Versions
FreeBSDFreeBSD	15.1-RELEASE to before p4Affected 15.0-RELEASE to before p14Affected 14.5-RELEASE to before p1Affected 14.4-RELEASE to before p10Affected

References

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

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