CVE-2021-47179

NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return()

EPSS 0.2%

Vexday Risk Score

3Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS —EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

25 Mar 2024Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

Affected products

Linux · Linux

References

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