CVEs-PoC/2021/CVE-2021-3929.md

### [CVE-2021-3929](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3929)
![](https://img.shields.io/static/v1?label=Product&message=QEMU&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=Fixed%20in%20qemu-kvm%207.0.0-rc0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-416%20-%20Use%20After%20Free&color=brightgreen)

### Description

A DMA reentrancy issue was found in the NVM Express Controller (NVME) emulation in QEMU. This CVE is similar to CVE-2021-3750 and, just like it, when the reentrancy write triggers the reset function nvme_ctrl_reset(), data structs will be freed leading to a use-after-free issue. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition or, potentially, executing arbitrary code within the context of the QEMU process on the host.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/NaInSec/CVE-PoC-in-GitHub
- https://github.com/QiuhaoLi/CVE-2021-3929-3947
- https://github.com/SYRTI/POC_to_review
- https://github.com/Technetium1/stars
- https://github.com/WhooAmii/POC_to_review
- https://github.com/k0mi-tg/CVE-POC
- https://github.com/lemon-mint/stars
- https://github.com/manas3c/CVE-POC
- https://github.com/nomi-sec/PoC-in-GitHub
- https://github.com/trhacknon/Pocingit
- https://github.com/whoforget/CVE-POC
- https://github.com/youwizard/CVE-POC
- https://github.com/zecool/cve