cve/2021/CVE-2021-4028.md

### [CVE-2021-4028](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4028)
![](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-416%20-%20Use%20After%20Free&color=brighgreen)

### Description

A flaw in the Linux kernel's implementation of RDMA communications manager listener code allowed an attacker with local access to setup a socket to listen on a high port allowing for a list element to be used after free. Given the ability to execute code, a local attacker could leverage this use-after-free to crash the system or possibly escalate privileges on the system.

### POC

#### Reference
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bc0bdc5afaa74

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/EGI-Federation/SVG-advisories