CVE-2021-47179 - CVE House
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Status published Medium CVE-2021-47179

NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return()

Vulnerability Description

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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Affected Vendor

Affected Software

Linux
Vulnerable Versions:
80e34f4957ec3010c85f9bb0b568a8d46acdf535, 7b7b9774643220e53eef58c15bb29bd4182fe053, 9ffa7967f9379a0a1b924e9ffeda709d72237da7, 6be0e4b59314e4a836495f6ffdc5d2c5b079deeb, 2fafe7d5047f98791afd9a1d90d2afb70debc590, 7e65ea887d0c0997f3053acd91a027af45e71c5b, de144ff4234f935bd2150108019b5d87a90a8a96, 96260bde1ea8ae31a5402fe506abbb8951d5a42c, 5.11.20, 4.9.269, 4.14.233, 4.19.191, 5.4.118, 5.10.36, 5.12.3

Timeline

Official Publish: March 25th, 2024
Last Modified: May 23rd, 2026
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.