CVE-2025-39946

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If the socket has a tiny buffer, however,\nwe read out the data sooner, to prevent connection stalls.\nMake sure that we abort the connection when we find out late\nthat the record is actually invalid. Retrying the parsing is\nfine in itself but since we copy some more data each time\nbefore we parse we can overflow the allocated skb space.\n\nConstructing a scenario in which we're under pressure without\nenough data in the socket to parse the length upfront is quite\nhard. syzbot figured out a way to do this by serving us the header\nin small OOB sends, and then filling in the recvbuf with a large\nnormal send.\n\nMake sure that tls_rx_msg_size() aborts strp, if we reach\nan invalid record there's really no way to recover."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ntls: asegurarse de abortar el flujo si los encabezados son inv\u00e1lidos\n\nNormalmente esperamos a que el socket almacene en b\u00fafer todo el registro antes de procesarlo. Sin embargo, si el socket tiene un b\u00fafer diminuto, leemos los datos antes para evitar bloqueos de conexi\u00f3n. Asegurarse de que abortamos la conexi\u00f3n cuando descubrimos tarde que el registro es realmente inv\u00e1lido. Reintentar el an\u00e1lisis est\u00e1 bien en s\u00ed mismo, pero dado que copiamos m\u00e1s datos cada vez antes de analizar, podemos desbordar el espacio skb asignado.\n\nConstruir un escenario en el que estamos bajo presi\u00f3n sin suficientes datos en el socket para analizar la longitud de antemano es bastante dif\u00edcil. syzbot encontr\u00f3 una manera de hacer esto sirvi\u00e9ndonos el encabezado en peque\u00f1os env\u00edos OOB, y luego llenando el recvbuf con un env\u00edo normal grande.\n\nAsegurarse de que tls_rx_msg_size() aborta strp; si llegamos a un registro inv\u00e1lido, realmente no hay forma de recuperarse."}], "id": "CVE-2025-39946", "lastModified": "2026-10-19T21:10:00.160", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-39946", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-06-16T16:09:56.692660Z", "version": "2.0.3"}}]}, "published": "2025-10-04T08:15:47.747", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0aeb54ac4cd5cf8f60131b4d9ec0b6dc9c27b20d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/208640e6225cc929a05adbf79d1df558add3e231"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4cefe5be73886f383639fe0850bb72d5b568a7b9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/61ca2da5fb8f433ce8bbd1657c84a86272133e6b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b36462146d86b1f22e594fe4dae611dffacfb203"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: tls: make sure to abort the stream if headers are bogus", "id": "2401414", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2401414"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\ntls: make sure to abort the stream if headers are bogus\nNormally we wait for the socket to buffer up the whole record\nbefore we service it. If the socket has a tiny buffer, however,\nwe read out the data sooner, to prevent connection stalls.\nMake sure that we abort the connection when we find out late\nthat the record is actually invalid. Retrying the parsing is\nfine in itself but since we copy some more data each time\nbefore we parse we can overflow the allocated skb space.\nConstructing a scenario in which we're under pressure without\nenough data in the socket to parse the length upfront is quite\nhard. syzbot figured out a way to do this by serving us the header\nin small OOB sends, and then filling in the recvbuf with a large\nnormal send.\nMake sure that tls_rx_msg_size() aborts strp, if we reach\nan invalid record there's really no way to recover."], "name": "CVE-2025-39946", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:rhivos:1", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat In-Vehicle Operating System 1"}], "public_date": "2025-10-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-39946\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-39946\nhttps://lore.kernel.org/linux-cve-announce/2025100419-CVE-2025-39946-5f17@gregkh/T"], "threat_severity": "Important"}

{"created": "2025-10-06T14:41:56.649899+00:00", "updated": "2026-06-18T17:45:13.106396+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-119"]}