CVE-2026-49423

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"75973F7C-645A-438C-A03B-C77AAAD20C15", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "When building the iovec array for a received TLS 1.2 CBC record, ktls_ocf_tls_cbc_decrypt() incremented the iovec index for every mbuf in the chain, including mbufs that were skipped because they contained only TLS header bytes. This left uninitialized entries in the iovec array. The iovec array was allocated without zeroing.\n\nA remote TLS peer can cause the kernel to read from uninitialized iovec entries during HMAC computation, resulting in a kernel panic. The peer must be able to control TCP segmentation such that the first mbuf of a CBC record contains only the 5-byte TLS record header."}, {"lang": "es", "value": "Al construir el array iovec para un registro TLS 1.2 CBC recibido, ktls_ocf_tls_cbc_decrypt() incrementaba el \u00edndice iovec por cada mbuf en la cadena, incluyendo mbufs que fueron omitidos porque conten\u00edan solo bytes de cabecera TLS. Esto dejaba entradas no inicializadas en el array iovec. El array iovec fue asignado sin inicializar a cero.\n\nUn par TLS remoto puede hacer que el kernel lea de entradas iovec no inicializadas durante el c\u00e1lculo de HMAC, resultando en un p\u00e1nico del kernel. El par debe ser capaz de controlar la segmentaci\u00f3n TCP de tal manera que el primer mbuf de un registro CBC contenga solo la cabecera de registro TLS de 5 bytes."}], "id": "CVE-2026-49423", "lastModified": "2026-11-09T20:10:00.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 3.3, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 1.4, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-49423", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-26T17:51:26.420678Z", "version": "2.0.3"}}]}, "published": "2026-08-19T07:16:28.570", "references": [{"source": "secteam@freebsd.org", "tags": ["Vendor Advisory"], "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:46.ktls.asc"}], "sourceIdentifier": "secteam@freebsd.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-908"}], "source": "secteam@freebsd.org", "type": "Secondary"}]}

{}

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