Privilege escalation in Freebsd
CVE-2025-15547
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.
Vulnerability class: Privilege Escalation
EPSS: 0.001 (1.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Freebsd — versions 14.3, 13.5, 14.3-RELEASE
Weakness classification (CWE)
References
- secteam@freebsd.org (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-15547?
- CVE-2025-15547 is a high-severity vulnerability in Freebsd, classified under Improper Privilege Management. CVSS score: 8.8/10. Published 2026-03-09.
- How severe is CVE-2025-15547?
- High severity. CVSS v3 base score is 8.8 out of 10.