CVEs-PoC/2021/CVE-2021-4145.md

### [CVE-2021-4145](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4145)
![](https://img.shields.io/static/v1?label=Product&message=QEMU&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-476&color=brighgreen)

### Description

A NULL pointer dereference issue was found in the block mirror layer of QEMU in versions prior to 6.2.0. The `self` pointer is dereferenced in mirror_wait_on_conflicts() without ensuring that it's not NULL. A malicious unprivileged user within the guest could use this flaw to crash the QEMU process on the host when writing data reaches the threshold of mirroring node.

### POC

#### Reference
No PoCs from references.

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