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.
Published: 2022-02-18
Score: 8.8 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
EUVD EUVD EUVD-2021-33979 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.
Ubuntu USN Ubuntu USN USN-5265-1 Linux kernel vulnerabilities
History

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Subscriptions

Canonical Ubuntu Linux
Fedoraproject Fedora
Linux Linux Kernel
Redhat Enterprise Linux
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

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

Reserved: 2021-12-10T00:00:00.000Z

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

cve-icon OpenCVE Enrichment

No data.

Weaknesses