CVE-2025-15547

High

Description

By default, jailed processes cannot mount filesystems, including nullfs(4). However, the allow.mount.nullfs option enables mounting nullfs filesystems, subject to privilege checks. If a privileged user within a jail is able to nullfs-mount directories, a limitation of the kernel's path lookup logic allows that user to escape the jail's chroot, yielding access to the full filesystem of the host or parent jail. In a jail configured to allow nullfs(4) mounts from within the jail, the jailed root user can escape the jail's filesystem root.

SeverityHigh

CVSS8.8

Exploit probability—

Product

Freebsd

PublishedMar 9, 2026

First seenMar 9, 2026

Weakness typeCWE-269Improper privilege management

How to fix

Vendor advisories

security.freebsd.org/advisories/FreeBSD-SA-26:02.jail.asc

Affected products

Product	Affected versions	Fixed in
freebsd freebsd	13.5, 14.3	—

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