CVE-2026-49419

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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."}, {"lang": "es", "value": "Cuando se especifica la bandera JAIL_AT_DESC, kern_jail_set() y kern_jail_get() liberaron la referencia a la prisi\u00f3n actual del llamador antes de buscar el descriptor de jail. Si la b\u00fasqueda del descriptor fallaba, las rutas de manejo de errores liberaban la misma referencia una segunda vez.\n\nUn usuario local sin privilegios puede desencadenar un desbordamiento negativo del contador de referencias de prisi\u00f3n, lo que puede causar que la estructura de prisi\u00f3n sea liberada mientras a\u00fan est\u00e1 en uso. Cuando esto se hace en el host de jail, el error generalmente resultar\u00e1 en un p\u00e1nico inmediato. Sin embargo, si el usuario se est\u00e1 ejecutando en un jail, entonces puede ser posible exploit el error para elevar privilegios."}], "id": "CVE-2026-49419", "lastModified": "2026-11-05T20:10:00.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-49419", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-08-20T03:56:04.011376Z", "version": "2.0.3"}}]}, "published": "2026-08-19T05:17:04.053", "references": [{"source": "secteam@freebsd.org", "tags": ["Vendor Advisory"], "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:38.jail.asc"}], "sourceIdentifier": "secteam@freebsd.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-911"}], "source": "secteam@freebsd.org", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[15.1-RELEASE,p1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[15.0-RELEASE,p11)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "FreeBSD", "source": "cna", "vendor": "FreeBSD"}, "product": "freebsd", "vendor": "freebsd"}], "created": "2026-08-19T06:30:05.492651+00:00", "updated": "2026-08-21T02:00:05.425831+00:00", "vendors": ["freebsd", "freebsd$PRODUCT$freebsd"]}