CVE-2026-101304

High

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.

SeverityHigh

CVSS7.1

Exploit probability—

Product

Freebsd

PublishedOct 15, 2026

First seenOct 15, 2026

Weakness typeCWE-273CWE-273

How to fix

Vendor advisories

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

Affected products

Product	Affected versions	Fixed in
freebsd freebsd	14.4, 14.5, 15.0, 15.1	—

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