Vulnerability-Lookup

GSD-2021-47179

Vulnerability from gsd - Updated: 2024-04-03 05:03

Details

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.

Aliases

CVE-2021-47179

JSON

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{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
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CVE-2021-47179 (GCVE-0-2021-47179)

Vulnerability from cvelistv5 – Published: 2024-03-25 09:16 – Updated: 2026-08-05 08:46

Title

NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return()

Summary

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-03-25 15:17 UTC

Assigner

Linux mitre root Scorecard

References

7 references

URL	Tags
https://git.kernel.org/stable/c/4e1ba532dbc1a0e19…
https://git.kernel.org/stable/c/42637ca25c7d7b5a9…
https://git.kernel.org/stable/c/39785761feadf261b…
https://git.kernel.org/stable/c/aba3c7795f51717ae…
https://git.kernel.org/stable/c/f9890652185b72b8d…
https://git.kernel.org/stable/c/b090d110e66636bca…
https://git.kernel.org/stable/c/a421d218603ffa822…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 80e34f4957ec3010c85f9bb0b568a8d46acdf535 , < 4e1ba532dbc1a0e19fc2458d74ab8d98680c4e42 (git) Affected: 7b7b9774643220e53eef58c15bb29bd4182fe053 , < 42637ca25c7d7b5a92804a679af5192e8c1a9f48 (git) Affected: 9ffa7967f9379a0a1b924e9ffeda709d72237da7 , < 39785761feadf261bc5101372b0b0bbaf6a94494 (git) Affected: 6be0e4b59314e4a836495f6ffdc5d2c5b079deeb , < aba3c7795f51717ae316f3566442dee7cc3eeccb (git) Affected: 2fafe7d5047f98791afd9a1d90d2afb70debc590 , < f9890652185b72b8de9ebeb4406037640b6e1b53 (git) Affected: 7e65ea887d0c0997f3053acd91a027af45e71c5b , < b090d110e66636bca473fd8b98d5c97b555a965a (git) Affected: de144ff4234f935bd2150108019b5d87a90a8a96 , < a421d218603ffa822a0b8045055c03eae394a7eb (git) Affected: 96260bde1ea8ae31a5402fe506abbb8951d5a42c (git) Affected: 5.11.20 , < 5.12 (semver)
Linux	Linux	Affected: 4.9.269 , < 4.9.271 (semver) Affected: 4.14.233 , < 4.14.235 (semver) Affected: 4.19.191 , < 4.19.193 (semver) Affected: 5.4.118 , < 5.4.124 (semver) Affected: 5.10.36 , < 5.10.42 (semver) Affected: 5.12.3 , < 5.12.9 (semver)

Show details on NVD website

JSON

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            {
              "lang": "en",
              "value": "AV:N - This is NFSv4/pNFS client code reached while handling layout return after interaction with a remote pNFS MDS/DS peer; a malicious or compromised server can drive the return path (e.g., block/scsi layout I/O errors with PNFS_LAYOUTRET_ON_ERROR, or ordinary layout lifecycle on an active mount).\nAC:L - The crash is a deterministic NULL dereference of the missing layout-range argument and was reported as consistently reproducible on NFSv4.1/4.2 pNFS workloads; the attacker can reliably force layout return once layouts exist.\nPR:N - The attacker can be the remote NFS/pNFS server and needs no privileges on the victim client; client-local credentials are not required for the server-driven trigger.\nUI:N - In a realistic deployment the client already has an active pNFS mount (fstab/automount/infrastructure storage), so exploitation does not require a separate victim action beyond normal use of that mount.\nS:U - Impact is limited to the client kernel/NFS client security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:N - The bug is a pure NULL pointer dereference of return_range with no out-of-bounds read or other information-disclosure primitive.\nI:N - There is no memory write, type confusion, or corruption path\u2014only a NULL dereference\u2014so integrity is unaffected.\nA:H - Dereferencing the NULL layout-range pointer causes a kernel oops/panic in pnfs_mark_matching_lsegs_return(), which is a high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:46:31.594Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4e1ba532dbc1a0e19fc2458d74ab8d98680c4e42"
        },
        {
          "url": "https://git.kernel.org/stable/c/42637ca25c7d7b5a92804a679af5192e8c1a9f48"
        },
        {
          "url": "https://git.kernel.org/stable/c/39785761feadf261bc5101372b0b0bbaf6a94494"
        },
        {
          "url": "https://git.kernel.org/stable/c/aba3c7795f51717ae316f3566442dee7cc3eeccb"
        },
        {
          "url": "https://git.kernel.org/stable/c/f9890652185b72b8de9ebeb4406037640b6e1b53"
        },
        {
          "url": "https://git.kernel.org/stable/c/b090d110e66636bca473fd8b98d5c97b555a965a"
        },
        {
          "url": "https://git.kernel.org/stable/c/a421d218603ffa822a0b8045055c03eae394a7eb"
        }
      ],
      "title": "NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47179",
    "datePublished": "2024-03-25T09:16:28.787Z",
    "dateReserved": "2024-03-25T09:12:14.112Z",
    "dateUpdated": "2026-08-05T08:46:31.594Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

GSD-2021-47179

CVE-2021-47179 (GCVE-0-2021-47179)

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Sightings

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