{"id":"CVE-2026-101305","title":"renameat(2) did not enforce FD_RESOLVE_BENEATH on its directory arguments","summary":"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…","severity":"high","cwe":["CWE-273"],"vendor":"FreeBSD","product":"FreeBSD","affected":["FreeBSD >= 15.1-RELEASE < p4","FreeBSD >= 15.0-RELEASE < p14","FreeBSD >= 14.5-RELEASE < p1","FreeBSD >= 14.4-RELEASE < p10"],"published":"2026-10-15","updated":"2026-10-15","sourceUpdated":"2026-10-15T16:17:41.437","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-101305","references":[{"url":"https://security.freebsd.org/advisories/FreeBSD-SA-26:66.jail.asc","label":"secteam@freebsd.org"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-10-15T07:57:27.843Z","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T18:30:17.230798Z"},"cvssSource":"adp","epss":0.00232,"epssPercentile":0.13993,"slug":"CVE-2026-101305","body":"## Overview\n\nrenameat(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.\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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":223176,"id":"CVE-2026-101305","ts":1792176226705,"field":"cvss","old":null,"new":"8.8"},{"seq":223175,"id":"CVE-2026-101305","ts":1792176226705,"field":"severity","old":"none","new":"high"}]}