CVEs-PoC/2021/CVE-2021-4203.md

### [CVE-2021-4203](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4203)
![](https://img.shields.io/static/v1?label=Product&message=kernel&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-362-%3ECWE-416&color=brighgreen)

### Description

A use-after-free read flaw was found in sock_getsockopt() in net/core/sock.c due to SO_PEERCRED and SO_PEERGROUPS race with listen() (and connect()) in the Linux kernel. In this flaw, an attacker with a user privileges may crash the system or leak internal kernel information.

### POC

#### Reference
- https://www.oracle.com/security-alerts/cpujul2022.html

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/sam8k/Dynamic-and-Static-Analysis-of-SOUPs