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.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published: 2022-02-18T17:50:37

Updated: 2024-08-03T17:16:03.525Z

Reserved: 2021-12-10T00:00:00

Link: CVE-2021-4093

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2022-02-18T18:15:10.363

Modified: 2024-11-21T06:36:53.303

Link: CVE-2021-4093

cve-icon Redhat

Severity : Moderate

Publid Date: 2021-11-22T00:00:00Z

Links: CVE-2021-4093 - Bugzilla