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Permalink CVE-2023-4155
created 4 months, 3 weeks ago
Sev-es / sev-snp vmgexit double fetch vulnerability

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`).

Affected products

kernel
kernel-rt

Matching in nixpkgs

pkgs.linux-doc

Linux kernel html documentation

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GUI for trace-cmd which is an interface for the Linux kernel ftrace subsystem

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