CVE-2021-4090

Description

An out-of-bounds (OOB) memory write flaw was found in the NFSD in the Linux kernel. Missing sanity may lead to a write beyond bmval[bmlen-1] in nfsd4_decode_bitmap4 in fs/nfsd/nfs4xdr.c. In this flaw, a local attacker with user privilege may gain access to out-of-bounds memory, leading to a system integrity and confidentiality threat.

Category

7.1
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.04%
Third-Party Advisory redhat.com Third-Party Advisory netapp.com
Affected: n/a kernel
Published at:
Updated at:

References

Link Tags
https://bugzilla.redhat.com/show_bug.cgi?id=2025101 issue tracking third party advisory patch
https://lore.kernel.org/linux-nfs/163692036074.16710.5678362976688977923.stgit%40klimt.1015granger.net/
https://security.netapp.com/advisory/ntap-20220318-0010/ third party advisory

Frequently Asked Questions

What is the severity of CVE-2021-4090?
CVE-2021-4090 has been scored as a high severity vulnerability.
How to fix CVE-2021-4090?
To fix CVE-2021-4090, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-4090 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-4090 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-4090?
CVE-2021-4090 affects n/a kernel.
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