CVE-2021-47401

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must\nspecifically not be allocated on the stack to avoid leaking information\nto user space (or triggering an oops).\n\nDrivers should not try to encode topology information in the tty device\nname but this one snuck in through staging without anyone noticing and\nanother driver has since copied this malpractice.\n\nFixing the ABI is a separate issue, but this at least plugs the security\nhole."}, {"lang": "es", "value": " En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ipack: ipoctal: corrige la fuga de informaci\u00f3n de la pila. El nombre del controlador tty tambi\u00e9n se usa despu\u00e9s de registrar el controlador y espec\u00edficamente no debe asignarse en la pila para evitar filtrar informaci\u00f3n al espacio del usuario (o activar un ups). Los controladores no deber\u00edan intentar codificar informaci\u00f3n de topolog\u00eda en el nombre del dispositivo tty, pero este se col\u00f3 durante la preparaci\u00f3n sin que nadie se diera cuenta y desde entonces otro controlador copi\u00f3 esta mala pr\u00e1ctica. Arreglar la ABI es un tema aparte, pero esto al menos tapa el agujero de seguridad."}], "id": "CVE-2021-47401", "lastModified": "2026-08-04T10:17:02.143", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "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-2021-47401", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-05-21T17:32:53.103904Z", "version": "2.0.3"}}]}, "published": "2024-05-21T15:15:25.563", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0a9c36a2e06a249acbed64e8e0b84637c2ad7575"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2725925982dc96a78069cd118ea3d66759bfdad7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5f6a309a699675680df15d9b6d389114515b4426"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/741ea2670e021350e54f491106bdaa22dc50e6a0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/829f13d6079cf7a2465522f39acb43033e9b320d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8657158a3b68c85234e6da3d8eae33d6183588b7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a89936cce87d60766a75732a9e7e25c51164f47c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/acb96e782bad427ca4bb1bd94af660acd1462380"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0a9c36a2e06a249acbed64e8e0b84637c2ad7575"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2725925982dc96a78069cd118ea3d66759bfdad7"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5f6a309a699675680df15d9b6d389114515b4426"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/741ea2670e021350e54f491106bdaa22dc50e6a0"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/829f13d6079cf7a2465522f39acb43033e9b320d"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8657158a3b68c85234e6da3d8eae33d6183588b7"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a89936cce87d60766a75732a9e7e25c51164f47c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/acb96e782bad427ca4bb1bd94af660acd1462380"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-668"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ipack: ipoctal: fix stack information leak", "id": "2282335", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282335"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-402", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nipack: ipoctal: fix stack information leak\nThe tty driver name is used also after registering the driver and must\nspecifically not be allocated on the stack to avoid leaking information\nto user space (or triggering an oops).\nDrivers should not try to encode topology information in the tty device\nname but this one snuck in through staging without anyone noticing and\nanother driver has since copied this malpractice.\nFixing the ABI is a separate issue, but this at least plugs the security\nhole."], "name": "CVE-2021-47401", "package_state": [{"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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47401\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47401\nhttps://lore.kernel.org/linux-cve-announce/2024052149-CVE-2021-47401-10e4@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-07-12T22:31:17.751210+00:00", "updated": "2025-07-12T22:31:17.751274+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}