Vulnerability-Lookup

GHSA-W5G2-4RXC-H7X8

Vulnerability from github – Published: 2024-03-25 12:30 – Updated: 2024-05-16 21:31

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.

Severity

5.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47179"
  ],
  "database_specific": {
    "cwe_ids": [
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    "severity": "MODERATE"
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  "id": "GHSA-w5g2-4rxc-h7x8",
  "modified": "2024-05-16T21:31:56Z",
  "published": "2024-03-25T12:30:52Z",
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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

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

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)

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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.

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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GHSA-W5G2-4RXC-H7X8

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

Tags

Sightings

Nomenclature

Related by attack behaviour