{"id":"CVE-2026-101304","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-101304","summary":"When fdescfs(4) was mounted in a jail with the \"nodup\" option, opening /dev/fd/N returned a descriptor that did not inherit FD_RESOLVE_BENEATH or the Capsicum capability rights of descriptor…","details":"When fdescfs(4) was mounted in a jail with the \"nodup\" option, opening /dev/fd/N returned a descriptor that did not inherit FD_RESOLVE_BENEATH or the Capsicum capability rights of descriptor N.\n\nA 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.","published":"2026-10-15T07:17:57.550","modified":"2026-10-20T00:18:29.480","cvss":{"score":7.1,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":null,"references":[{"type":"FIX","url":"https://security.freebsd.org/advisories/FreeBSD-SA-26:66.jail.asc"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-10-20T00:18:29.480"}}