CVE-2026-101305 — Multiple jail filesystem root escapes
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 r…
Published: 2026-10-15 · CVSS: 8.8 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7