Vulnerability 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`).
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | - |
| Redhat | Enterprise Linux | 8.0 |
| Fedoraproject | Fedora | 37 |
Related Weaknesses (CWE)
References
- https://access.redhat.com/security/cve/CVE-2023-4155Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2213802Issue TrackingPatchThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2023-4155Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2213802Issue TrackingPatchThird Party Advisory
FAQ
What is CVE-2023-4155?
CVE-2023-4155 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 a...
How severe is CVE-2023-4155?
CVE-2023-4155 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-4155?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Redhat Enterprise Linux, Fedoraproject Fedora.