CVE-2025-15547 — Jail escape by a privileged user via nullfs

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
FreeBSD / FreeBSD	affected 14.3-RELEASE before p8; affected 13.5-RELEASE before p9

CWE

CWE-269

References

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

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.