CVE-2023-4155 Sev-es / sev-snp vmgexit double fetch vulnerability

What is CVE-2023-4155?

CVE-2023-4155 is a medium-severity vulnerability in Fedoraproject Fedora, published on 13 Sep 2023. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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`).

Weakness: CWE-367

Which versions are affected by CVE-2023-4155?

It affects 3 products.

Products include Fedoraproject Fedora, Linux kernel, Redhat Enterprise Linux.

How do I fix CVE-2023-4155?

Apply the vendor's patch.

Is CVE-2023-4155 being exploited?

There is no known exploitation of CVE-2023-4155 in the wild and no public exploit code.

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All Fedoraproject Fedora vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-29700, DEBIAN-CVE-2023-4155, GHSA-7f5q-x8vx-pfrp, UBUNTU-CVE-2023-4155.