Buffer overflow in FreeBSD - CVE-2025-15547
Published: April 22, 2026
Vulnerability identifier: #VU126827
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-15547
CWE-ID: CWE-119
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: FreeBSD Foundation
Affected software:
FreeBSD
FreeBSD
Detailed vulnerability description
The vulnerability allows a local privileged user to escape the jail filesystem root.
The vulnerability exists due to improper restriction of operations within the bounds of a memory buffer in the kernel path lookup logic when mounting nullfs filesystems from within a jail. A local privileged user can mount a nullfs directory to escape the jail filesystem root.
Only jails configured with the allow.mount.nullfs option are vulnerable.
How to mitigate CVE-2025-15547
Install security update from vendor's website.