{
  "id": "CVE-2021-47108",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2024-03-04T19:15:18.837",
  "lastModified": "2025-01-07T20:14:35.703",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "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."
    }
  ],
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        "type": "Primary",
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          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
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        "exploitabilityScore": 1.8,
        "impactScore": 3.6
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