NullFS Mount Escape Vulnerability in FreeBSD Jail Environment
CVE-2025-15547

8.8HIGH

Key Information:

Vendor

FreeBSD

Status
FreeBSD
Vendor
CVE Published:
9 March 2026

What is CVE-2025-15547?

In FreeBSD's jail environment, a configuration flaw allows privileged users to utilize the nullfs(4) mount option to escape the chroot confines of the jail. When nullfs mounts are permitted within a jail, this vulnerability arises due to the kernel's path lookup logic, which can be manipulated by a jailed root user. Consequently, this can lead to unauthorized access to the complete filesystem of the host or parent jail, posing significant risks to system integrity.

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Affected Version(s)

FreeBSD 14.3-RELEASE

FreeBSD 13.5-RELEASE

References

https://security.freebsd.org/advisories/FreeBSD-SA-26:02....
vendor-advisory

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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