FKIE_CVE-2021-47179

Vulnerability from fkie_nvd - Published: 2024-03-25 10:15 - Updated: 2026-06-17 04:16
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: NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return() Commit de144ff4234f changes _pnfs_return_layout() to call pnfs_mark_matching_lsegs_return() passing NULL as the struct pnfs_layout_range argument. Unfortunately, pnfs_mark_matching_lsegs_return() doesn't check if we have a value here before dereferencing it, causing an oops. I'm able to hit this crash consistently when running connectathon basic tests on NFS v4.1/v4.2 against Ontap.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/39785761feadf261bc5101372b0b0bbaf6a94494Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/42637ca25c7d7b5a92804a679af5192e8c1a9f48Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4e1ba532dbc1a0e19fc2458d74ab8d98680c4e42Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a421d218603ffa822a0b8045055c03eae394a7ebPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aba3c7795f51717ae316f3566442dee7cc3eeccbPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b090d110e66636bca473fd8b98d5c97b555a965aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f9890652185b72b8de9ebeb4406037640b6e1b53Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/39785761feadf261bc5101372b0b0bbaf6a94494Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/42637ca25c7d7b5a92804a679af5192e8c1a9f48Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4e1ba532dbc1a0e19fc2458d74ab8d98680c4e42Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a421d218603ffa822a0b8045055c03eae394a7ebPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/aba3c7795f51717ae316f3566442dee7cc3eeccbPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b090d110e66636bca473fd8b98d5c97b555a965aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f9890652185b72b8de9ebeb4406037640b6e1b53Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/pnfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4e1ba532dbc1a0e19fc2458d74ab8d98680c4e42",
              "status": "affected",
              "version": "80e34f4957ec3010c85f9bb0b568a8d46acdf535",
              "versionType": "git"
            },
            {
              "lessThan": "42637ca25c7d7b5a92804a679af5192e8c1a9f48",
              "status": "affected",
              "version": "7b7b9774643220e53eef58c15bb29bd4182fe053",
              "versionType": "git"
            },
            {
              "lessThan": "39785761feadf261bc5101372b0b0bbaf6a94494",
              "status": "affected",
              "version": "9ffa7967f9379a0a1b924e9ffeda709d72237da7",
              "versionType": "git"
            },
            {
              "lessThan": "aba3c7795f51717ae316f3566442dee7cc3eeccb",
              "status": "affected",
              "version": "6be0e4b59314e4a836495f6ffdc5d2c5b079deeb",
              "versionType": "git"
            },
            {
              "lessThan": "f9890652185b72b8de9ebeb4406037640b6e1b53",
              "status": "affected",
              "version": "2fafe7d5047f98791afd9a1d90d2afb70debc590",
              "versionType": "git"
            },
            {
              "lessThan": "b090d110e66636bca473fd8b98d5c97b555a965a",
              "status": "affected",
              "version": "7e65ea887d0c0997f3053acd91a027af45e71c5b",
              "versionType": "git"
            },
            {
              "lessThan": "a421d218603ffa822a0b8045055c03eae394a7eb",
              "status": "affected",
              "version": "de144ff4234f935bd2150108019b5d87a90a8a96",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "96260bde1ea8ae31a5402fe506abbb8951d5a42c",
              "versionType": "git"
            },
            {
              "lessThan": "5.12",
              "status": "affected",
              "version": "5.11.20",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/pnfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4.9.271",
              "status": "affected",
              "version": "4.9.269",
              "versionType": "semver"
            },
            {
              "lessThan": "4.14.235",
              "status": "affected",
              "version": "4.14.233",
              "versionType": "semver"
            },
            {
              "lessThan": "4.19.193",
              "status": "affected",
              "version": "4.19.191",
              "versionType": "semver"
            },
            {
              "lessThan": "5.4.124",
              "status": "affected",
              "version": "5.4.118",
              "versionType": "semver"
            },
            {
              "lessThan": "5.10.42",
              "status": "affected",
              "version": "5.10.36",
              "versionType": "semver"
            },
            {
              "lessThan": "5.12.9",
              "status": "affected",
              "version": "5.12.3",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "498E5552-CBDA-4FE4-8844-EE7D575C9F35",
              "versionEndExcluding": "4.9.271",
              "versionStartIncluding": "4.9.269",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "F80A9838-744C-4554-8CCE-B87128CC7170",
              "versionEndExcluding": "4.14.235",
              "versionStartIncluding": "4.14.233",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "BE4BABC9-D544-4D14-BF94-5E999CDF4847",
              "versionEndExcluding": "4.19.193",
              "versionStartIncluding": "4.19.191",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "255B5502-D9A3-44BD-9B79-7C957CA4B62B",
              "versionEndExcluding": "5.4.124",
              "versionStartIncluding": "5.4.118",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "FAF8C28F-086A-4EC2-A931-2237C11F5F54",
              "versionEndExcluding": "5.10.42",
              "versionStartIncluding": "5.10.36",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "148AD795-DE39-4B4E-BDFF-D6A492C22C4C",
              "versionEndExcluding": "5.12.9",
              "versionStartIncluding": "5.12.3",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return()\n\nCommit de144ff4234f changes _pnfs_return_layout() to call\npnfs_mark_matching_lsegs_return() passing NULL as the struct\npnfs_layout_range argument. Unfortunately,\npnfs_mark_matching_lsegs_return() doesn\u0027t check if we have a value here\nbefore dereferencing it, causing an oops.\n\nI\u0027m able to hit this crash consistently when running connectathon basic\ntests on NFS v4.1/v4.2 against Ontap."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: NFSv4: corrige una desreferencia de puntero NULL en pnfs_mark_matching_lsegs_return(). Confirme los cambios de144ff4234f _pnfs_return_layout() para llamar a pnfs_mark_matching_lsegs_return() pasando NULL como argumento de estructura pnfs_layout_range. Desafortunadamente, pnfs_mark_matching_lsegs_return() no verifica si tenemos un valor aqu\u00ed antes de eliminar la referencia a \u00e9l, lo que provoca un error. Puedo alcanzar este bloqueo de manera consistente cuando ejecuto pruebas b\u00e1sicas de Connectathon en NFS v4.1/v4.2 contra Ontap."
    }
  ],
  "id": "CVE-2021-47179",
  "lastModified": "2026-06-17T04:16:50.747",
  "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"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-47179",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-03-25T15:17:57.286141Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-03-25T10:15:09.317",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
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      "url": "https://git.kernel.org/stable/c/39785761feadf261bc5101372b0b0bbaf6a94494"
    },
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    },
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    },
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      "tags": [
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    },
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      "tags": [
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    },
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    },
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    },
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      "tags": [
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      ],
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    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.