CVE-2026-49427

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"75973F7C-645A-438C-A03B-C77AAAD20C15", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Pages belonging to largepage shared memory objects were not explicitly wired. When sendfile(2) transmitted such an object with the SF_NOCACHE flag, it freed the underlying pages after transmission even though existing mappings still referred to them.\n\nAn unprivileged local user can abuse the bug to access freed kernel memory. This can be exploited to escalate privileges."}, {"lang": "es", "value": "P\u00e1ginas pertenecientes a objetos de memoria compartida de p\u00e1ginas grandes no estaban cableadas expl\u00edcitamente. Cuando sendfile(2) transmit\u00eda dicho objeto con la bandera SF_NOCACHE, liberaba las p\u00e1ginas subyacentes despu\u00e9s de la transmisi\u00f3n aunque las asignaciones existentes a\u00fan se refer\u00edan a ellas.\n\nUn usuario local sin privilegios puede abusar del error para acceder a memoria del kernel liberada. Esto puede ser explotado para escalar privilegios."}], "id": "CVE-2026-49427", "lastModified": "2026-11-09T20:10:00.200", "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-2026-49427", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-08-20T03:56:01.222360Z", "version": "2.0.3"}}]}, "published": "2026-08-19T06:17:41.977", "references": [{"source": "secteam@freebsd.org", "tags": ["Vendor Advisory"], "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:44.posixshm.asc"}], "sourceIdentifier": "secteam@freebsd.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-826"}], "source": "secteam@freebsd.org", "type": "Secondary"}]}

{}

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