CVE-2026-101306 Multiple jail filesystem root escapes

Critical 9.8 Published 15 Oct 2026 Updated 16 Oct 2026

A process in a FreeBSD jail can escape filesystem root restrictions by clearing FD_RESOLVE_BENEATH via self-sent file descriptors.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-101306?

CVE-2026-101306 is a critical vulnerability in Freebsd Freebsd, published on 15 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-281, CWE-273

Which versions are affected by CVE-2026-101306?

It affects 1 product.

Products include Freebsd Freebsd.

How do I fix CVE-2026-101306?

No fix has been published for CVE-2026-101306 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-101306 being exploited?

There is no known exploitation of CVE-2026-101306 in the wild and no public exploit code.

All Freebsd Freebsd vulnerabilities

Sources

Also known as GHSA-3c4j-rmc7-2x5m.