CVE-2026-40668
MEDIUMCVSS 4.6/10EPSS 0.20%
Last modified
CVE-2026-40668 is a medium-severity vulnerability rated 4.6/10 on the CVSS scale. Authentication bypass by spoofing in AMD Secure Encrypted Virtualization (SEV) firmware could allow a malicious hypervisor to request attestation reports for VMPL 0.. EPSS estimates a 0.20% chance of exploitation in the next 30 days.
Description
Authentication bypass by spoofing in AMD Secure Encrypted Virtualization (SEV) firmware could allow a malicious hypervisor to request attestation reports for VMPL 0.
Metrics
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| AMD | AMD EPYC™ 9004 Series Processors | All versions |
| AMD | AMD EPYC™ 7003 Series Processors | All versions |
| AMD | AMD EPYC™ 9005 Series Processors | All versions |
| AMD | AMD EPYC™ 8004 Series Processors | All versions |
| AMD | AMD EPYC™ 8005 Series Processors | All versions |
| AMD | AMD EPYC™ Embedded 7003 Series Processors | All versions |
| AMD | AMD EPYC™ Embedded 9004 Series Processors (formerly codenamed "Genoa") | All versions |
| AMD | AMD EPYC™ Embedded 9004 Series Processors (formerly codenamed "Bergamo") | All versions |
| AMD | AMD EPYC™ Embedded 8004 Series Processors | All versions |
| AMD | AMD EPYC™ Embedded 9005 Series Processors | All versions |
References
Timeline
- Published
- Last Modified
- Status
- Awaiting Analysis
Frequently Asked Questions
What is CVE-2026-40668?
Authentication bypass by spoofing in AMD Secure Encrypted Virtualization (SEV) firmware could allow a malicious hypervisor to request attestation reports for VMPL 0.
How severe is CVE-2026-40668?
CVE-2026-40668 has a CVSS score of 4.6/10 (MEDIUM severity). The EPSS model estimates a 0.20% probability of exploitation in the next 30 days.
How do I fix CVE-2026-40668?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
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Are you affected by CVE-2026-40668?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST