CVE-2021-47179

low-risk
Published 2024-03-25

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.

Do I need to act?

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0.01% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.5/10 Medium
LOCAL / LOW complexity

Affected Products (1)

Affected Vendors

Linux

References (14)

Patch https://git.kernel.org/stable/c/39785761feadf261bc5101372b0b0bbaf6a94494
Patch https://git.kernel.org/stable/c/42637ca25c7d7b5a92804a679af5192e8c1a9f48
Patch https://git.kernel.org/stable/c/4e1ba532dbc1a0e19fc2458d74ab8d98680c4e42
Patch https://git.kernel.org/stable/c/a421d218603ffa822a0b8045055c03eae394a7eb
Patch https://git.kernel.org/stable/c/aba3c7795f51717ae316f3566442dee7cc3eeccb
Patch https://git.kernel.org/stable/c/b090d110e66636bca473fd8b98d5c97b555a965a
Patch https://git.kernel.org/stable/c/f9890652185b72b8de9ebeb4406037640b6e1b53
Patch https://git.kernel.org/stable/c/39785761feadf261bc5101372b0b0bbaf6a94494
Patch https://git.kernel.org/stable/c/42637ca25c7d7b5a92804a679af5192e8c1a9f48
Patch https://git.kernel.org/stable/c/4e1ba532dbc1a0e19fc2458d74ab8d98680c4e42
Patch https://git.kernel.org/stable/c/a421d218603ffa822a0b8045055c03eae394a7eb
Patch https://git.kernel.org/stable/c/aba3c7795f51717ae316f3566442dee7cc3eeccb
Patch https://git.kernel.org/stable/c/b090d110e66636bca473fd8b98d5c97b555a965a
Patch https://git.kernel.org/stable/c/f9890652185b72b8de9ebeb4406037640b6e1b53
23
/ 100
low-risk
Severity 18/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal