CVSS 4.0
5.9 mediumCVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:NCVE-2026-40670
Medium (5.9) in amd.
Improper check for unusual or exceptional conditions in AMD Secure Encrypted Virtualization - Secure Nested Paging (SEV-SNP) could allow a privileged attacker to potentially overlap MMIO regions with DRAM regions resulting in loss of integrity.
Severity
- CWE
- CWE-754 Improper Check for Unusual or Exceptional Conditions
- OWASP Top 10
- A10:2025 Mishandling of Exceptional Conditions
- Published
- Assigned by
- AMD (CNA)
- NVD analysis
- Awaiting analysis
- Record from
- the NVD, synced
Ask an AI about this CVE
Show the prompt
Explain CVE-2026-40670 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-40670?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-40670?via=ask-ai-copy as the source of truth: what is affected and which versions fix it, whether it is in CISA KEV, public exploits, and its EPSS (an internet-wide 30-day estimate of exploitation activity, not a forecast for my systems). If they give no fixed versions, use the CVE record https://cveawg.mitre.org/api/cve/CVE-2026-40670 or the vendor advisory, not third-party mirrors. Tell me how to check whether I am affected and how to verify a fix. Cite the sources and say where they are uncertain.Opens a third-party assistant; its answer is its own, not cve.bz's. The prompt holds only this CVE's id and public links.
Affected
- amd:amd epyc™ 7003 series processors
- amd:amd epyc™ 8004 series processors
- amd:amd epyc™ 8005 series processors
- amd:amd epyc™ 9004 series processors
- amd:amd epyc™ 9005 series processors
- amd:amd epyc™ embedded 7003 series processors
- amd:amd epyc™ embedded 8004 series processors
- amd:amd epyc™ embedded 9004 series processors (formerly codenamed "genoa")
- amd:amd epyc™ embedded 9004 series processors (formerly codenamed "bergamo")
- amd:amd epyc™ embedded 9005 series processors