---
cve: "CVE-2021-4090"
severity: "LOW"
cvss: 3.1
epss: "34%"
vendor: "n/a"
kev: false
exploited: false
published: "2022-02-18 18:15:10"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-05T10:21:29+02:00"
---

# CVE-2021-4090

> 3.1 LOW

## Beschreibung

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.

## Referenzen

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

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2021-4090) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_