---
id: CVE-2026-101306
title: >-
  SCM_RIGHTS file descriptor passing did not preserve FD_RESOLVE_BENEATH when a
  descriptor was transferred
summary: >-
  SCM_RIGHTS file descriptor passing did not preserve FD_RESOLVE_BENEATH when a
  descriptor was transferred.  A process could clear the restriction by sending
  the descriptor to itself over a Unix domain socket.


  A process in a jail that has…
severity: none
cwe:
  - CWE-273
  - CWE-281
vendor: FreeBSD
product: FreeBSD
affected:
  - FreeBSD >= 15.1-RELEASE < p4
  - FreeBSD >= 15.0-RELEASE < p14
  - FreeBSD >= 14.5-RELEASE < p1
  - FreeBSD >= 14.4-RELEASE < p10
published: '2026-10-15'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T07:17:57.780'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-101306'
references:
  - url: 'https://security.freebsd.org/advisories/FreeBSD-SA-26:66.jail.asc'
    label: secteam@freebsd.org
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-15T07:57:27.843Z'
---

## Overview

SCM_RIGHTS file descriptor passing did not preserve FD_RESOLVE_BENEATH when a descriptor was transferred.  A process could clear the restriction by sending the descriptor to itself over a Unix domain socket.

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.