HIGH 8.8 Microsoft

CVE-2021-4093

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.

Microsoft Security Update 2022-Feb: 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.

Affected Products

References

Published: 2022-02-08 · Source: Microsoft · Feed updated: 2026-09-07
This high severity vulnerability with a CVSS score of 8.8 was published on 2022-02-08 via Microsoft. Affected: cm1 kernel 5.10.102.1-1 on CBL Mariner 1.0.
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