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Unrated severityNVD Advisory· Published Sep 13, 2023· Updated Feb 27, 2025

Sev-es / sev-snp vmgexit double fetch vulnerability

CVE-2023-4155

Description

A flaw was found in KVM AMD Secure Encrypted Virtualization (SEV) in the Linux kernel. A KVM guest using SEV-ES or SEV-SNP with multiple vCPUs can trigger a double fetch race condition vulnerability and invoke the VMGEXIT handler recursively. If an attacker manages to call the handler multiple times, they can trigger a stack overflow and cause a denial of service or potentially guest-to-host escape in kernel configurations without stack guard pages (CONFIG_VMAP_STACK).

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Affected products

176

Patches

Vulnerability mechanics

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