CVE-2021-4093

 

Published at: - 18-02-2022 07:15

Last modified: - 19-01-2023 04:53

Total changes: - 6

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

 

Verification logic

 

Reference

• https://bugs.chromium.org/p/project-zero/issues/detail?id=2222
• https://bugzilla.redhat.com/show_bug.cgi?id=2028584

 

Keywords

NVD

 

CVE-2021-4093

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures