CVE-2025-15547 Jail escape by a privileged user via nullfs
A privileged user in a FreeBSD jail with nullfs mounting enabled can escape the jail and access the host filesystem.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-15547?
CVE-2025-15547 is a high-severity vulnerability in Freebsd Freebsd, published on 9 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-269
Which versions are affected by CVE-2025-15547?
It affects 1 product.
Products include Freebsd Freebsd.
How do I fix CVE-2025-15547?
No fix has been published for CVE-2025-15547 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-15547 being exploited?
There is no known exploitation of CVE-2025-15547 in the wild and no public exploit code.
Other vulnerabilities in Freebsd Freebsd
Sources
Also known as GHSA-vpcc-r2qv-r2q4.