CVE-2021-47179

NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return()

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.

Category

5.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.01%
Affected: Linux Linux
Affected: Linux Linux
Published at:
Updated at:

References

Link Tags
https://git.kernel.org/stable/c/4e1ba532dbc1a0e19fc2458d74ab8d98680c4e42 patch
https://git.kernel.org/stable/c/42637ca25c7d7b5a92804a679af5192e8c1a9f48 patch
https://git.kernel.org/stable/c/39785761feadf261bc5101372b0b0bbaf6a94494 patch
https://git.kernel.org/stable/c/aba3c7795f51717ae316f3566442dee7cc3eeccb patch
https://git.kernel.org/stable/c/f9890652185b72b8de9ebeb4406037640b6e1b53 patch
https://git.kernel.org/stable/c/b090d110e66636bca473fd8b98d5c97b555a965a patch
https://git.kernel.org/stable/c/a421d218603ffa822a0b8045055c03eae394a7eb patch

Frequently Asked Questions

What is the severity of CVE-2021-47179?
CVE-2021-47179 has been scored as a medium severity vulnerability.
How to fix CVE-2021-47179?
To fix CVE-2021-47179, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-47179 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-47179 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-47179?
CVE-2021-47179 affects Linux Linux, Linux Linux.
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