medium5.3
CVE-2023-4155
A flaw was found in KVM AMD Secure Encrypted Virtualization (SEV) in the Linux kernel.
Impact
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
| Vendor | Product | Affected versions |
|---|---|---|
| Linux | Linux Kernel | All versions |
| Redhat | Enterprise Linux | Versions 8.0, 9.0 |
| Fedoraproject | Fedora | Versions 37, 38 |