← back
CVE-2021-47179high

NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return()

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.5epss 0.7%
exploitation probability
0.7%top 51% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Linux · Linux
References
https://git.kernel.org/stable/c/39785761feadf261bc5101372b0b0bbaf6a94494https://git.kernel.org/stable/c/42637ca25c7d7b5a92804a679af5192e8c1a9f48https://git.kernel.org/stable/c/4e1ba532dbc1a0e19fc2458d74ab8d98680c4e42https://git.kernel.org/stable/c/a421d218603ffa822a0b8045055c03eae394a7ebhttps://git.kernel.org/stable/c/aba3c7795f51717ae316f3566442dee7cc3eeccbhttps://git.kernel.org/stable/c/b090d110e66636bca473fd8b98d5c97b555a965ahttps://git.kernel.org/stable/c/f9890652185b72b8de9ebeb4406037640b6e1b53