CVE-2026-101306

This vulnerability affects all supported versions of FreeBSD . The SCM_RIGHTS file descriptor passing mechanism fails to preserve the FD_RESOLVE_BENEATH flag when a descriptor is transferred. An attacker can exploit this by sending a directory file descriptor to themselves over a Unix domain sock...

CVE-2026-101306 Multiple jail filesystem root escapes

SCMRIGHTS file descriptor passing did not preserve FDRESOLVEBENEATH when a descriptor was transferred. A process could clear the restriction by sending the descriptor to itself over a Unix domain socket. A process in a jail that has received a directory file descriptor from another jail can use...

CVE-2026-101305

The FreeBSD operating system is affected by a vulnerability where the renameat(2) system call fails to enforce the FD_RESOLVE_BENEATH flag on directory arguments. This flaw allows a process within a jail to escape the jail's filesystem root restriction by renaming a directory relative to a restri...

CVE-2026-101305 Multiple jail filesystem root escapes

renameat2 did not enforce FDRESOLVEBENEATH on its directory arguments. A jailed process could rename a directory relative to a restricted descriptor, then escape the jail root via fchdir2. This requires the directory to reside on a filesystem that is also reachable from the jail's root. A process...

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...