CVE-2025-15547
HIGHCVSS v3
8.8
HIGH
EPSS Score
0.0%
exploit probability
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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
Technical Details
- CVSS v3 Vector
- 3.1
- Published
- 3/9/2026
- Last Modified
- 3/17/2026
Frequently Asked Questions
What is 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
Is CVE-2025-15547 actively exploited?
Active exploitation of CVE-2025-15547 has not been confirmed. The EPSS score is 0.0%, indicating the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2025-15547?
CVE-2025-15547 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string 3.1.
Is CVE-2025-15547 affecting your environment?
Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.