CVE-2026-49422

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"75973F7C-645A-438C-A03B-C77AAAD20C15", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The RACK setsockopt(2) handler drops the connection lock in order to copy option data from userspace, then reacquires the lock. After reacquiring, it verifies that the TCP stack had not been switched away, but did not reload its pointer to the stack's per-connection control block. If userspace switches stacks twice during this window, the check will succeed but the saved pointer will refer to freed memory.\n\nThe bug may be exploitable by an unprivileged local user to escalate privileges."}, {"lang": "es", "value": "El gestor RACK setsockopt(2) libera el bloqueo de conexi\u00f3n para copiar datos de opci\u00f3n desde el espacio de usuario, luego vuelve a adquirir el bloqueo. Despu\u00e9s de volver a adquirirlo, verifica que la pila TCP no se hab\u00eda cambiado, pero no recarg\u00f3 su puntero al bloque de control por conexi\u00f3n de la pila. Si el espacio de usuario cambia de pila dos veces durante esta ventana, la verificaci\u00f3n tendr\u00e1 \u00e9xito pero el puntero guardado har\u00e1 referencia a memoria liberada.\n\nEl error puede ser explotable por un usuario local no privilegiado para escalar privilegios."}], "id": "CVE-2026-49422", "lastModified": "2026-11-09T20:10:00.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-49422", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-08-19T00:00:00+00:00", "version": "2.0.3"}}]}, "published": "2026-08-19T06:17:41.447", "references": [{"source": "secteam@freebsd.org", "tags": ["Vendor Advisory"], "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:43.tcp.asc"}], "sourceIdentifier": "secteam@freebsd.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "secteam@freebsd.org", "type": "Secondary"}]}

{}

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