CVE-2026-101306

CriticalCVSS 9.8/10Last modified Oct 20, 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.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-273 CWE-281

Affected software

Vendor	Product	Versions
FreeBSD	FreeBSD	>= 15.1-RELEASE, < p4; >= 15.0-RELEASE, < p14; >= 14.5-RELEASE, < p1; >= 14.4-RELEASE, < p10

References

https://security.freebsd.org/advisories/FreeBSD-SA-26:66.jail.ascPatch, Vendor Advisory

Timeline

Published: Oct 15, 2026
Last modified: Oct 20, 2026
NVD status: Analyzed

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