CVE-2026-101304

HighCVSS 7.1/10Last modified Oct 20, 2026

Description

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.

Metrics

CVSS 3.1 7.1/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-273

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: Modified

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