fkie_cve-2021-47276
Vulnerability from fkie_nvd
Published
2024-05-21 15:15
Modified
2025-04-30 14:46
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ftrace: Do not blindly read the ip address in ftrace_bug() It was reported that a bug on arm64 caused a bad ip address to be used for updating into a nop in ftrace_init(), but the error path (rightfully) returned -EINVAL and not -EFAULT, as the bug caused more than one error to occur. But because -EINVAL was returned, the ftrace_bug() tried to report what was at the location of the ip address, and read it directly. This caused the machine to panic, as the ip was not pointing to a valid memory address. Instead, read the ip address with copy_from_kernel_nofault() to safely access the memory, and if it faults, report that the address faulted, otherwise report what was in that location.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fbPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fbPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13


To clipboard 

{
  "configurations": [
    {
      "nodes": [
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  ],
  "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."
    }
  ],
  "id": "CVE-2021-47276",
  "lastModified": "2025-04-30T14:46:07.833",
  "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"
      }
    ]
  },
  "published": "2024-05-21T15:15:15.983",
  "references": [
    {
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      "tags": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-706"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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