5.5

CVE-2021-47179

NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return()

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 4.9.269 < 4.9.271
Linux ≫ Linux Kernel Version >= 4.14.233 < 4.14.235
Linux ≫ Linux Kernel Version >= 4.19.191 < 4.19.193
Linux ≫ Linux Kernel Version >= 5.4.118 < 5.4.124
Linux ≫ Linux Kernel Version >= 5.10.36 < 5.10.42
Linux ≫ Linux Kernel Version >= 5.12.3 < 5.12.9
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.23% 0.131
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

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