CVE-2021-47108

{"id": "CVE-2021-47108", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "[email protected]", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2024-03-04T19:15:18.837", "references": [{"url": "https://git.kernel.org/stable/c/3b8e19a0aa3933a785be9f1541afd8d398c4ec69", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/71d07ebc5000b9c1d140e99e7493b0bafa954776", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/3b8e19a0aa3933a785be9f1541afd8d398c4ec69", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/71d07ebc5000b9c1d140e99e7493b0bafa954776", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "[email protected]", "description": [{"lang": "en", "value": "CWE-476"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/mediatek: hdmi: Perform NULL pointer check for mtk_hdmi_conf\n\nIn commit 41ca9caaae0b\n(\"drm/mediatek: hdmi: Add check for CEA modes only\") a check\nfor CEA modes was added to function mtk_hdmi_bridge_mode_valid()\nin order to address possible issues on MT8167;\nmoreover, with commit c91026a938c2\n(\"drm/mediatek: hdmi: Add optional limit on maximal HDMI mode clock\")\nanother similar check was introduced.\n\nUnfortunately though, at the time of writing, MT8173 does not provide\nany mtk_hdmi_conf structure and this is crashing the kernel with NULL\npointer upon entering mtk_hdmi_bridge_mode_valid(), which happens as\nsoon as a HDMI cable gets plugged in.\n\nTo fix this regression, add a NULL pointer check for hdmi->conf in the\nsaid function, restoring HDMI functionality and avoiding NULL pointer\nkernel panics."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: drm/mediatek: hdmi: realice una verificaci\u00f3n de puntero NULL para mtk_hdmi_conf En el commit 41ca9caaae0b (\"drm/mediatek: hdmi: agregue verificaci\u00f3n solo para modos CEA\") se agreg\u00f3 una verificaci\u00f3n para los modos CEA funcionar mtk_hdmi_bridge_mode_valid() para solucionar posibles problemas en MT8167; Adem\u00e1s, con el commit c91026a938c2 (\"drm/mediatek: hdmi: Agregar l\u00edmite opcional en el reloj m\u00e1ximo en modo HDMI\") se introdujo otra verificaci\u00f3n similar. Desafortunadamente, al momento de escribir este art\u00edculo, MT8173 no proporciona ninguna estructura mtk_hdmi_conf y esto bloquea el kernel con un puntero NULL al ingresar a mtk_hdmi_bridge_mode_valid(), lo que sucede tan pronto como se conecta un cable HDMI. Para solucionar esta regresi\u00f3n, agregue un El puntero NULL comprueba hdmi->conf en dicha funci\u00f3n, restaurando la funcionalidad HDMI y evitando p\u00e1nicos del kernel del puntero NULL."}], "lastModified": "2025-01-07T20:14:35.703", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "901A6B90-4B30-4E61-9B88-844D6E11AE47", "versionEndExcluding": "5.15.12", "versionStartIncluding": "5.14"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "357AA433-37E8-4323-BFB2-3038D6E4B414"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A73429BA-C2D9-4D0C-A75F-06A1CA8B3983"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.16:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F621B5E3-E99D-49E7-90B9-EC3B77C95383"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.16:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F7BFDCAA-1650-49AA-8462-407DD593F94F"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.16:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6EC9882F-866D-4ACB-8FBC-213D8D8436C8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.16:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8A0915FE-A4AA-4C94-B783-CF29D81E7E54"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}