fkie_cve-2021-47353
Vulnerability from fkie_nvd
Published
2024-05-21 15:15
Modified
2024-12-24 16:11
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: udf: Fix NULL pointer dereference in udf_symlink function In function udf_symlink, epos.bh is assigned with the value returned by udf_tgetblk. The function udf_tgetblk is defined in udf/misc.c and returns the value of sb_getblk function that could be NULL. Then, epos.bh is used without any check, causing a possible NULL pointer dereference when sb_getblk fails. This fix adds a check to validate the value of epos.bh.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/21bf1414580c36ffc8d8de043beb3508cf812238Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2f3d9ddd32a28803baa547e6274983b67d5e287cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3638705ecd5ad2785e996f820121c0ad15ce64b5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/371566f63cbd0bb6fbb25b8fe9d5798268d35af9Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5150877e4d99f85057a458daac7cd7c01005d5c6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/80d505aee6398cf8beb72475c7edcf1733c1c68bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aebed6b19e51a34003d998da5ebb1dfdd2cb1d02Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/baea588a42d675e35daeaddd10fbc9700550bc4dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fa236c2b2d4436d9f19ee4e5d5924e90ffd7bb43Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/21bf1414580c36ffc8d8de043beb3508cf812238Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2f3d9ddd32a28803baa547e6274983b67d5e287cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3638705ecd5ad2785e996f820121c0ad15ce64b5Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/371566f63cbd0bb6fbb25b8fe9d5798268d35af9Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5150877e4d99f85057a458daac7cd7c01005d5c6Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/80d505aee6398cf8beb72475c7edcf1733c1c68bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/aebed6b19e51a34003d998da5ebb1dfdd2cb1d02Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/baea588a42d675e35daeaddd10fbc9700550bc4dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/fa236c2b2d4436d9f19ee4e5d5924e90ffd7bb43Patch
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 *


To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "10282F37-B17F-4974-967E-FCD5ABC9AB8E",
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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\nudf: Fix NULL pointer dereference in udf_symlink function\n\nIn function udf_symlink, epos.bh is assigned with the value returned\nby udf_tgetblk. The function udf_tgetblk is defined in udf/misc.c\nand returns the value of sb_getblk function that could be NULL.\nThen, epos.bh is used without any check, causing a possible\nNULL pointer dereference when sb_getblk fails.\n\nThis fix adds a check to validate the value of epos.bh."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: udf: Se corrigi\u00f3 la desreferencia del puntero NULL en la funci\u00f3n udf_symlink. En la funci\u00f3n udf_symlink, a epos.bh se le asigna el valor devuelto por udf_tgetblk. La funci\u00f3n udf_tgetblk est\u00e1 definida en udf/misc.c y devuelve el valor de la funci\u00f3n sb_getblk que podr\u00eda ser NULL. Luego, epos.bh se usa sin ninguna verificaci\u00f3n, lo que provoca una posible desreferencia del puntero NULL cuando falla sb_getblk. Esta soluci\u00f3n agrega una verificaci\u00f3n para validar el valor de epos.bh."
    }
  ],
  "id": "CVE-2021-47353",
  "lastModified": "2024-12-24T16:11:59.943",
  "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": "2024-05-21T15:15:21.693",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-476"
        }
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      "source": "nvd@nist.gov",
      "type": "Primary"
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}


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