CVE-2021-47179
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…
Does this matter?
Lower severity and a low EPSS score (0.67%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.67% probability · 50th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.