{
  "id": "CVE-2021-47276",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2024-05-21T15:15:15.983",
  "lastModified": "2024-11-21T06:35:46.860",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nftrace: Do not blindly read the ip address in ftrace_bug()\n\nIt was reported that a bug on arm64 caused a bad ip address to be used for\nupdating into a nop in ftrace_init(), but the error path (rightfully)\nreturned -EINVAL and not -EFAULT, as the bug caused more than one error to\noccur. But because -EINVAL was returned, the ftrace_bug() tried to report\nwhat was at the location of the ip address, and read it directly. This\ncaused the machine to panic, as the ip was not pointing to a valid memory\naddress.\n\nInstead, read the ip address with copy_from_kernel_nofault() to safely\naccess the memory, and if it faults, report that the address faulted,\notherwise report what was in that location."
    },
    {
      "lang": "es",
      "value": " En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: ftrace: no lea ciegamente la direcci\u00f3n IP en ftrace_bug(). Se inform\u00f3 que un error en arm64 provoc\u00f3 que se usara una direcci\u00f3n IP incorrecta para actualizar a un nop en ftrace_init() , pero la ruta de error (con raz\u00f3n) devolvi\u00f3 -EINVAL y no -EFAULT, ya que el error provoc\u00f3 que ocurriera m\u00e1s de un error. Pero debido a que se devolvi\u00f3 -EINVAL, ftrace_bug() intent\u00f3 informar qu\u00e9 hab\u00eda en la ubicaci\u00f3n de la direcci\u00f3n IP y leerlo directamente. Esto provoc\u00f3 que la m\u00e1quina entrara en p\u00e1nico, ya que la IP no apuntaba a una direcci\u00f3n de memoria v\u00e1lida. En su lugar, lea la direcci\u00f3n IP con copy_from_kernel_nofault() para acceder de forma segura a la memoria y, si falla, informe que la direcci\u00f3n fall\u00f3; de lo contrario, informe qu\u00e9 hab\u00eda en esa ubicaci\u00f3n."
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
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}