What’s Vulnerable › Vulnerabilities
CVE-2025-15547: Jail escape by a privileged user via nullfs
- Severity: high (CVSS 8.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-03-09 · updated 2026-06-17
- Weakness: CWE-269
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.
Affected products
- FreeBSD: 13.5, 13.5-p1, 13.5-p2, 13.5-p3, 13.5-p4, 13.5-p5 (+11)
References
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