CVE-2026-101305

HighCVSS 8.8/10Last modified Oct 20, 2026

Description

renameat(2) did not enforce FD_RESOLVE_BENEATH on its directory arguments. A jailed process could rename a directory relative to a restricted descriptor, then escape the jail root via fchdir(2). This requires the directory to reside on a filesystem that is also reachable from the jail's root.

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.

Metrics

CVSS 3.1 8.8/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-273

Affected software

No affected versions have been published.

Timeline

Published: Oct 15, 2026
Last modified: Oct 20, 2026
NVD status: Analyzed

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