### [CVE-2021-4093](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4093)
![](https://img.shields.io/static/v1?label=Product&message=kernel&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=kernel%205.15%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=(CWE-125%7CCWE-787)&color=brightgreen)

### Description

A flaw was found in the KVM's AMD code for supporting the Secure Encrypted Virtualization-Encrypted State (SEV-ES). A KVM guest using SEV-ES can trigger out-of-bounds reads and writes in the host kernel via a malicious VMGEXIT for a string I/O instruction (for example, outs or ins) using the exit reason SVM_EXIT_IOIO. This issue results in a crash of the entire system or a potential guest-to-host escape scenario.

### POC

#### Reference
No PoCs from references.

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