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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.9.269, < 4.9.271 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/39785761feadf261bc5101372b0b0bbaf6a94494Patch
- https://git.kernel.org/stable/c/42637ca25c7d7b5a92804a679af5192e8c1a9f48Patch
- https://git.kernel.org/stable/c/4e1ba532dbc1a0e19fc2458d74ab8d98680c4e42Patch
- https://git.kernel.org/stable/c/a421d218603ffa822a0b8045055c03eae394a7ebPatch
- https://git.kernel.org/stable/c/aba3c7795f51717ae316f3566442dee7cc3eeccbPatch
- https://git.kernel.org/stable/c/b090d110e66636bca473fd8b98d5c97b555a965aPatch
- https://git.kernel.org/stable/c/f9890652185b72b8de9ebeb4406037640b6e1b53Patch
- https://git.kernel.org/stable/c/39785761feadf261bc5101372b0b0bbaf6a94494Patch
- https://git.kernel.org/stable/c/42637ca25c7d7b5a92804a679af5192e8c1a9f48Patch
- https://git.kernel.org/stable/c/4e1ba532dbc1a0e19fc2458d74ab8d98680c4e42Patch
- https://git.kernel.org/stable/c/a421d218603ffa822a0b8045055c03eae394a7ebPatch
- https://git.kernel.org/stable/c/aba3c7795f51717ae316f3566442dee7cc3eeccbPatch
- https://git.kernel.org/stable/c/b090d110e66636bca473fd8b98d5c97b555a965aPatch
- https://git.kernel.org/stable/c/f9890652185b72b8de9ebeb4406037640b6e1b53Patch
FAQ
What is CVE-2021-47179?
CVE-2021-47179 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 ca...
How severe is CVE-2021-47179?
CVE-2021-47179 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-47179?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.