PT-2026-21819 · Freebsd · Freebsd

Published 2026-02-24 · Updated 2026-03-09 · CVE-2025-15547

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions FreeBSD (affected versions not specified)

Description A flaw exists in FreeBSD where, by default, jailed processes are restricted from mounting filesystems, including nullfs(4). However, enabling the 'allow.mount.nullfs' option permits mounting nullfs filesystems, subject to privilege checks. A privileged user within a jail, capable of nullfs-mounting directories, can exploit a kernel path lookup logic issue to escape the jail's chroot, gaining access to the host or parent jail's filesystem. Specifically, a jailed root user in a jail configured to allow nullfs(4) mounts can escape the jail's filesystem root.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Improper Privilege Management

Weakness Enumeration

CWE-269

Related Identifiers

CVE-2025-15547

Affected Products

Freebsd

References · 11

• https://nvd.nist.gov/vuln/detail/CVE-2025-15547 · Security Note
• https://security.freebsd.org/advisories/FreeBSD-SA-26:02.jail.asc · Vendor Advisory
• https://twitter.com/CVEnew/status/2031122538223247670 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2031041448284397606 · Twitter Post
• https://freebsd.org/security/advisories/FreeBSD-SA-26:02.jail.asc · Note
• https://t.me/CVEtracker/46898 · Telegram Post
• https://twitter.com/nanovms/status/2026415136467202361 · Twitter Post
• https://twitter.com/nanovms/status/2028133744948007408 · Twitter Post
• https://twitter.com/xbeaudouin/status/2028285008071557174 · Twitter Post
• https://twitter.com/vuldb/status/2030982578828890509 · Twitter Post
• https://t.me/cveNotify/154774 · Telegram Post