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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/fbdev-dma: Add shadow buffering for deferred I/O\n\nDMA areas are not necessarily backed by struct page, so we cannot\nrely on it for deferred I/O. Allocate a shadow buffer for drivers\nthat require deferred I/O and use it as framebuffer memory.\n\nFixes driver errors about being \"Unable to handle kernel NULL pointer\ndereference at virtual address\" or \"Unable to handle kernel paging\nrequest at virtual address\".\n\nThe patch splits drm_fbdev_dma_driver_fbdev_probe() in an initial\nallocation, which creates the DMA-backed buffer object, and a tail\nthat sets up the fbdev data structures. There is a tail function for\ndirect memory mappings and a tail function for deferred I/O with\nthe shadow buffer.\n\nIt is no longer possible to use deferred I/O without shadow buffer.\nIt can be re-added if there exists a reliably test for usable struct\npage in the allocated DMA-backed buffer object."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/fbdev-dma: Se ha a\u00f1adido un b\u00fafer de sombra para E/S diferida. Las \u00e1reas de DMA no est\u00e1n necesariamente respaldadas por struct page, por lo que no podemos confiar en \u00e9l para la E/S diferida. Se asigna un b\u00fafer de sombra a los controladores que requieren E/S diferida y se utiliza como memoria de framebuffer. Se corrigen los errores del controlador \"No se puede gestionar la desreferencia de puntero nulo del kernel en la direcci\u00f3n virtual\" o \"No se puede gestionar la solicitud de paginaci\u00f3n del kernel en la direcci\u00f3n virtual\". El parche divide drm_fbdev_dma_driver_fbdev_probe() en una asignaci\u00f3n inicial, que crea el objeto de b\u00fafer respaldado por DMA, y una cola, que configura las estructuras de datos fbdev. Hay una funci\u00f3n de cola para asignaciones directas de memoria y otra para E/S diferida con el b\u00fafer de sombra. Ya no es posible utilizar la E/S diferida sin el b\u00fafer de sombra. Se puede volver a agregar si existe una prueba confiable de una p\u00e1gina de estructura utilizable en el objeto de b\u00fafer respaldado por DMA asignado."
    }
  ],
  "id": "CVE-2024-58091",
  "lastModified": "2025-10-31T16:21:23.047",
  "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"
      }
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  "published": "2025-03-27T15:15:54.237",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/0d087de947babf7ed70029d042abcc6ed06ff415"
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
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  ]
}