CVE-2026-101304

When fdescfs4 was mounted in a jail with the "nodup" option, opening /dev/fd/N returned a descriptor that did not inherit FDRESOLVEBENEATH or the Capsicum capability rights of descriptor N. A process in a jail that has received a directory file descriptor from another jail can use these technique...

CVE-2026-101304

A vulnerability exists in FreeBSD jails where a process can escape the jail's filesystem root restriction. When fdescfs(4) is mounted with the "nodup" option, opening /dev/fd/N returns a descriptor that fails to inherit FD_RESOLVE_BENEATH or Capsicum capability rights from descriptor N. This allo...

CVE-2026-101304 Multiple jail filesystem root escapes

When fdescfs4 was mounted in a jail with the "nodup" option, opening /dev/fd/N returned a descriptor that did not inherit FDRESOLVEBENEATH or the Capsicum capability rights of descriptor N. A process in a jail that has received a directory file descriptor from another jail can use these technique...