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CVE-2026-101304— Multiple jail filesystem root escapes

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.

当在 jail 环境中以 “nodup” 选项挂载 fdescfs(4) 时，打开 /dev/fd/N 所返回的文件描述符未能继承描述符 N 的 FD_RESOLVE_BENEATH 属性或 Capsicum 能力权限。 位于 jail 中的进程若从其他 jail 获取了目录文件描述符，便可利用此漏洞绕过 jail 的文件系统根目录限制，实现 jail 逃逸。

AI Predicted 9.8 Difficulty: Moderate EPSS 0.18% · P7

Affected Version Matrix 4

VendorProduct Version RangeStatus
FreeBSD FreeBSD 15.1-RELEASE< p4 affected
15.0-RELEASE< p14 affected
14.5-RELEASE< p1 affected
14.4-RELEASE< p10 affected
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I. Basic Information for CVE-2026-101304

Vulnerability Information
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Vulnerability Title
Multiple jail filesystem root escapes
Source: CVE Program / CVE List V5
Vulnerability Description
When fdescfs(4) was mounted in a jail with the "nodup" option, opening /dev/fd/N returned a descriptor that did not inherit FD_RESOLVE_BENEATH or the Capsicum capability rights of descriptor N. A process in a jail that has received a directory file descriptor from another jail can use these techniques to escape the jail's filesystem root restriction.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
对于放弃特权的检查不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeBSD FreeBSD 15.1-RELEASE ~ p4 -

II. Public POCs for CVE-2026-101304

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III. Intelligence Information for CVE-2026-101304

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Other References for CVE-2026-101304 (1)

Same Patch Batch · FreeBSD · 2026-10-15 · 13 CVEs total

CVE-2026-58099 Memory safety bugs in kqueue copy-on-fork implementation
CVE-2026-58098 Heap out-of-bounds access in semop(2)
CVE-2026-58100 Memory safety bugs in kqueue copy-on-fork implementation
CVE-2026-101302 Remote DoS via receive-side kernel TLS
CVE-2026-101306 Multiple jail filesystem root escapes
CVE-2026-101305 Multiple jail filesystem root escapes
CVE-2026-101303 IPv6 UDP sendto(2) bypasses jail loopback restriction
CVE-2026-101307 Remotely triggerable buffer overflow in tcp_rack
CVE-2026-101308 TOCTOU race between sound(4) buffer resizing and mmap
CVE-2026-101311 Multiple vulnerabilities in bhyve device models
CVE-2026-101309 Multiple vulnerabilities in bhyve device models
CVE-2026-101310 Multiple vulnerabilities in bhyve device models

IV. Related Vulnerabilities

Same product: FreeBSD
Same vendor: FreeBSD
Same weakness: CWE-273

V. Comments for CVE-2026-101304

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