High severity8.8NVD Advisory· Published Feb 18, 2022· Updated Jun 17, 2026
CVE-2021-4093
CVE-2021-4093
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.
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Affected products
2- KVM/KVMdescription
Patches
Vulnerability mechanics
References
2- bugzilla.redhat.com/show_bug.cginvdIssue TrackingPatchThird Party Advisory
- bugs.chromium.org/p/project-zero/issues/detailnvdExploitMailing ListPatchThird Party Advisory
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