cve-2021-47444
Vulnerability from cvelistv5
Published
2024-05-22 06:19
Modified
2024-11-04 12:06
Severity ?
Summary
drm/edid: In connector_bad_edid() cap num_of_ext by num_blocks read
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/09f3946bb452918dbfb1982add56f9ffaae393dc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/97794170b696856483f74b47bfb6049780d2d3a0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a7b45024f66f9ec769e8dbb1a51ae83cd05929c7
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

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                "id": "CVE-2021-47444",
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                "timestamp": "2024-05-24T19:29:09.418657Z",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/edid: In connector_bad_edid() cap num_of_ext by num_blocks read\n\nIn commit e11f5bd8228f (\"drm: Add support for DP 1.4 Compliance edid\ncorruption test\") the function connector_bad_edid() started assuming\nthat the memory for the EDID passed to it was big enough to hold\n`edid[0x7e] + 1` blocks of data (1 extra for the base block). It\ncompletely ignored the fact that the function was passed `num_blocks`\nwhich indicated how much memory had been allocated for the EDID.\n\nLet\u0027s fix this by adding a bounds check.\n\nThis is important for handling the case where there\u0027s an error in the\nfirst block of the EDID. In that case we will call\nconnector_bad_edid() without having re-allocated memory based on\n`edid[0x7e]`."
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    "dateReserved": "2024-05-21T14:58:30.832Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47444\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-22T07:15:09.660\",\"lastModified\":\"2024-05-22T12:46:53.887\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndrm/edid: In connector_bad_edid() cap num_of_ext by num_blocks read\\n\\nIn commit e11f5bd8228f (\\\"drm: Add support for DP 1.4 Compliance edid\\ncorruption test\\\") the function connector_bad_edid() started assuming\\nthat the memory for the EDID passed to it was big enough to hold\\n`edid[0x7e] + 1` blocks of data (1 extra for the base block). It\\ncompletely ignored the fact that the function was passed `num_blocks`\\nwhich indicated how much memory had been allocated for the EDID.\\n\\nLet\u0027s fix this by adding a bounds check.\\n\\nThis is important for handling the case where there\u0027s an error in the\\nfirst block of the EDID. In that case we will call\\nconnector_bad_edid() without having re-allocated memory based on\\n`edid[0x7e]`.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/edid: En conector_bad_edid() cap num_of_ext por num_blocks le\u00eddo En commit e11f5bd8228f (\\\"drm: Agregar soporte para prueba de corrupci\u00f3n edid de cumplimiento de DP 1.4\\\") la funci\u00f3n conector_bad_edid() comenz\u00f3 a asumir que la memoria para el EDID que se le pas\u00f3 era lo suficientemente grande como para contener bloques de datos `edid[0x7e] + 1` (1 adicional para el bloque base). Ignor\u00f3 por completo el hecho de que a la funci\u00f3n se le pas\u00f3 `num_blocks`, que indicaba cu\u00e1nta memoria se hab\u00eda asignado para el EDID. Arreglemos esto agregando una verificaci\u00f3n de los l\u00edmites. Esto es importante para manejar el caso en el que hay un error en el primer bloque del EDID. En ese caso llamaremos a Connector_bad_edid() sin haber reasignado memoria en base a `edid[0x7e]`.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/09f3946bb452918dbfb1982add56f9ffaae393dc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/97794170b696856483f74b47bfb6049780d2d3a0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a7b45024f66f9ec769e8dbb1a51ae83cd05929c7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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