CVE-2021-4090

HighCVSS 7.1/10Last modified Oct 14, 2026

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.

Metrics

CVSS 3.1 7.1/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-787

Affected software

Vendor	Product	Versions
Linux	kernel	>= 5.11, < 5.15.5
Siemens	SIMATIC S7-1500 TM MFP - GNU/Linux subsystem	< V1.1.1

References

https://bugzilla.redhat.com/show_bug.cgi?id=2025101Issue Tracking, Patch, Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c0019b7db1d7ac62c711cda6b357a659d46428fe
https://lore.kernel.org/linux-nfs/163692036074.16710.5678362976688977923.stgit%40klimt.1015granger.net/
https://security.netapp.com/advisory/ntap-20220318-0010/Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2025101Issue Tracking, Patch, Third Party Advisory
https://lore.kernel.org/linux-nfs/163692036074.16710.5678362976688977923.stgit%40klimt.1015granger.net/
https://security.netapp.com/advisory/ntap-20220318-0010/Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-265688.html

Timeline

Published: Feb 18, 2022
Last modified: Oct 14, 2026
NVD status: Modified

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