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For\n`do_insnlist_ioctl()`, the same data buffer elements are used for\nhandling a list of instructions, so ensure the first `MIN_SAMPLES`\nelements are initialized for each instruction that writes to the\nsubdevice."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: comedi: Se corrige la inicializaci\u00f3n de datos para instrucciones que escriben en el subdispositivo Se sabe que algunos controladores de instrucciones del subdispositivo Comedi acceden a elementos de datos de instrucci\u00f3n m\u00e1s all\u00e1 de los primeros elementos `insn->n` en algunos casos. Las funciones `do_insn_ioctl()` y `do_insnlist_ioctl()` asignan al menos `MIN_SAMPLES` (16) elementos de datos para lidiar con esto, pero no inicializan todo eso. Para los c\u00f3digos de instrucci\u00f3n Comedi que escriben en el subdispositivo, los primeros elementos de datos `insn->n` se copian del espacio de usuario, pero los elementos restantes se dejan sin inicializar. Eso podr\u00eda ser un problema si el controlador de instrucciones del subdispositivo lee los datos no inicializados. Aseg\u00farese de que los primeros elementos `MIN_SAMPLES` se inicialicen antes de llamar a estos controladores de instrucciones, llenando los elementos no copiados con 0. Para `do_insnlist_ioctl()`, se utilizan los mismos elementos del b\u00fafer de datos para manejar una lista de instrucciones, as\u00ed que aseg\u00farese de que los primeros elementos `MIN_SAMPLES` se inicialicen para cada instrucci\u00f3n que escriba en el subdispositivo."}], "id": "CVE-2025-38478", "lastModified": "2025-12-23T18:27:16.000", "metrics": {"cvssMetricV31": [{"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"}]}, "published": "2025-07-28T12:15:29.733", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/020eed5681d0f9bced73970368078a92d6cfaa9c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/13e4d9038a1e869445a996a3f604a84ef52fe8f4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/46d8c744136ce2454aa4c35c138cc06817f92b8e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/673ee92bd2d31055bca98a1d96b653f5284289c4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6f38c6380c3b38a05032b8881e41137385a6ce02"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c42116dc70af6664526f7aa82cf937824ab42649"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d3436638738ace8f101af7bdee2eae1bc38e9b29"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fe8713fb4e4e82a4f91910d9a41bf0613e69a0b9"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "Mailing List"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "Mailing List"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-908"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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{"created": "2025-07-29T07:59:28.937554+00:00", "updated": "2025-07-29T07:59:28.937624+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}