CVE-2026-101305

High

Description

renameat(2) did not enforce FD_RESOLVE_BENEATH on its directory arguments. A jailed process could rename a directory relative to a restricted descriptor, then escape the jail root via fchdir(2). This requires the directory to reside on a filesystem that is also reachable from the jail's root. 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

CVSS8.8

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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