{"cve":"CVE-2026-49419","nvd":{"published":"2026-08-19T05:17:04.053","modified":"2026-09-01T20:20:18.243","status":"Analyzed","description":"When the JAIL_AT_DESC flag is specified, kern_jail_set() and kern_jail_get() released the reference to the caller's current prison before looking up the jail descriptor.  If the descriptor lookup failed, error-handling paths released the same reference a second time.\n\nAn unprivileged local user can trigger a prison reference count underflow, which may cause the prison structure to be freed while still in use.  When this is done on the jail host, the bug will generally result in an immediate panic.  However, if the user is running in a jail, then it may be possible to exploit the bug to elevate privileges.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.8},"cwes":["CWE-911"],"references":["https://security.freebsd.org/advisories/FreeBSD-SA-26:38.jail.asc"],"products":["freebsd:freebsd"],"source":"nvd","synced_at":"2026-10-19T22:49:38.260478770+00:00"},"epss":{"cve":"CVE-2026-49419","score":0.00466,"percentile":0.40317,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}