CVEs-PoC/2021/CVE-2021-4090.md

### [CVE-2021-4090](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4090)
![](https://img.shields.io/static/v1?label=Product&message=kernel&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=kernel%205.16%20rc2%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-787&color=brightgreen)

### 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.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/ARPSyndicate/cvemon