Vulnerability Details CVE-2026-101305
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 34.7%
CVSS Severity
CVSS v3 Score 8.8