Improper Condition Check in AMD Secure Encrypted Virtualization Affecting Integrity
CVE-2026-40670

5.9MEDIUM

Key Information:

Vendor

Amd
Status
Amd Epyc™ 9004 Series Processors
Amd Epyc™ 7003 Series Processors
Amd Epyc™ 9005 Series Processors
Amd Epyc™ 8004 Series Processors
Vendor
CVE Published:
10 November 2026

What is CVE-2026-40670?

A vulnerability exists in AMD Secure Encrypted Virtualization, specifically within the Secure Nested Paging (SEV-SNP) implementation. This flaw arises from an improper check for unusual or exceptional conditions, potentially allowing a privileged attacker to interfere with memory management. By overlapping Memory-Mapped I/O (MMIO) regions with Dynamic Random-Access Memory (DRAM) regions, it could result in integrity loss. Organizations utilizing AMD SEV-SNP should be aware of this issue and take measures to mitigate the risks associated with it.

Affected Version(s)

AMD EPYC™ 7003 Series Processors MilanPI-SP3_1.0.0.K

AMD EPYC™ 8004 Series Processors GenoaPI_1.0.0.J

AMD EPYC™ 8005 Series Processors TurinPI_1.0.0.B

References

https://www.amd.com/en/resources/product-security/bulleti...

CVSS V4

Score:
5.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.