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.
References
Link Resource
https://bugs.chromium.org/p/project-zero/issues/detail?id=2222 Exploit Mailing List Patch Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2028584 Issue Tracking Patch Third Party Advisory
History

No history.

cve-icon MITRE Information

Status: PUBLISHED

Assigner: redhat

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

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

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


Link: CVE-2021-4093

JSON object: View

cve-icon NVD Information

Status : Modified

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

Modified: 2023-11-07T03:40:10.397


Link: CVE-2021-4093

JSON object: View

cve-icon Redhat Information

No data.