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CVE-2025-15547— Jail escape by a privileged user via nullfs

Quick assessment

Affected
FreeBSD FreeBSD
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeBSD是FreeBSD基金会的一套类Unix操作系统。 FreeBSD存在安全漏洞，该漏洞源于内核路径查找逻辑存在限制，可能导致配置了allow.mount.nullfs选项的jail中的特权用户逃逸jail的chroot。

AI Predicted 8.8 Difficulty: Easy EPSS 0.11% · P1

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2025-15547

Vulnerability Information
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Vulnerability Title
Jail escape by a privileged user via nullfs
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
FreeBSD 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeBSD是FreeBSD基金会的一套类Unix操作系统。 FreeBSD存在安全漏洞，该漏洞源于内核路径查找逻辑存在限制，可能导致配置了allow.mount.nullfs选项的jail中的特权用户逃逸jail的chroot。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeBSD FreeBSD 14.3-RELEASE ~ p8 -

II. Public POCs for CVE-2025-15547

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III. Intelligence Information for CVE-2025-15547

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Same Patch Batch · FreeBSD · 2026-03-09 · 6 CVEs total

CVE-2026-3038 Local DoS and possible privilege escalation via routing sockets
CVE-2026-2261 blocklistd(8) socket leak
CVE-2025-15576 Jail chroot escape via fd exchange with a different jail
CVE-2025-14558 Remote code execution via ND6 Router Advertisements
CVE-2025-14769 ipfw denial of service

IV. Related Vulnerabilities

Same product: FreeBSD
Same vendor: FreeBSD
Same weakness: CWE-269

V. Comments for CVE-2025-15547

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