fkie_cve-2021-46966
Vulnerability from fkie_nvd
Published
2024-02-27 19:04
Modified
2024-12-06 17:55
Summary
In the Linux kernel, the following vulnerability has been resolved: ACPI: custom_method: fix potential use-after-free issue In cm_write(), buf is always freed when reaching the end of the function. If the requested count is less than table.length, the allocated buffer will be freed but subsequent calls to cm_write() will still try to access it. Remove the unconditional kfree(buf) at the end of the function and set the buf to NULL in the -EINVAL error path to match the rest of function.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1d53ca5d131074c925ce38361fb0376d3bf7e394Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/62dc2440ebb552aa0d7f635e1697e077d9d21203Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/72814a94c38a33239793f7622cec6ace1e540c4bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8b04d57f30caf76649d0567551589af9a66ca9bePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/90575d1d9311b753cf1718f4ce9061ddda7dfd23Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a5b26a2e362f572d87e9fd35435680e557052a17Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b7a5baaae212a686ceb812c32fceed79c03c0234Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e483bb9a991bdae29a0caa4b3a6d002c968f94aaPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f16737caf41fc06cfe6e49048becb09657074d4bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1d53ca5d131074c925ce38361fb0376d3bf7e394Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/62dc2440ebb552aa0d7f635e1697e077d9d21203Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/72814a94c38a33239793f7622cec6ace1e540c4bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8b04d57f30caf76649d0567551589af9a66ca9bePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/90575d1d9311b753cf1718f4ce9061ddda7dfd23Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a5b26a2e362f572d87e9fd35435680e557052a17Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b7a5baaae212a686ceb812c32fceed79c03c0234Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e483bb9a991bdae29a0caa4b3a6d002c968f94aaPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f16737caf41fc06cfe6e49048becb09657074d4bPatch



{
  "configurations": [
    {
      "nodes": [
        {
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              "vulnerable": true
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          "negate": false,
          "operator": "OR"
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nACPI: custom_method: fix potential use-after-free issue\n\nIn cm_write(), buf is always freed when reaching the end of the\nfunction.  If the requested count is less than table.length, the\nallocated buffer will be freed but subsequent calls to cm_write() will\nstill try to access it.\n\nRemove the unconditional kfree(buf) at the end of the function and\nset the buf to NULL in the -EINVAL error path to match the rest of\nfunction."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ACPI: custom_method: soluciona un posible problema de use-after-free En cm_write(), buf siempre se libera al llegar al final de la funci\u00f3n. Si el recuento solicitado es menor que table.length, el b\u00fafer asignado se liberar\u00e1, pero las llamadas posteriores a cm_write() seguir\u00e1n intentando acceder a \u00e9l. Elimine el kfree(buf) incondicional al final de la funci\u00f3n y establezca el buf en NULL en la ruta de error -EINVAL para que coincida con el resto de la funci\u00f3n."
    }
  ],
  "id": "CVE-2021-46966",
  "lastModified": "2024-12-06T17:55:15.673",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2024-02-27T19:04:07.127",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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