CVSS 8.8 (high) · published 2026-10-15
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.
Affected products (NVD): freebsd freebsd
Weakness: CWE-273
Source: NVD CVE-2026-101305
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