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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
VLAI
Title
NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return()
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.
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
References
Impacted products
Vendor Product Version CPE status
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)
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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)
guessed Create a notification for this product.
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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 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T20:06:41+00:00",
      "cve": "CVE-2021-47179",
      "id": "CVE-2021-47179",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47179.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-02T02:19:28Z",
      "cve": "CVE-2021-47179",
      "id": "CVE-2021-47179",
      "initial_release_date": "2024-03-27T04:25:56Z",
      "product_status:known_affected": "388",
      "product_status:known_not_affected": "269",
      "product_status:recommended": "207",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47179",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47179.json",
      "version": "52"
    },
    "vulnrichment": {
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      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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

Author Source Type Date Other

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.


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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.