Ubuntu: (Multiple Advisories) (CVE-2023-4155): Linux kernel (OEM) vulnerabilities
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`).
Solution(s)
- ubuntu-upgrade-linux-image-6-1-0-1021-oem
- ubuntu-upgrade-linux-image-oem-22-04c
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