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CVE-2026-40668

4.6 medium

Medium (4.6) in amd.

On this page
Authentication bypass by spoofing in AMD Secure Encrypted Virtualization (SEV) firmware could allow a malicious hypervisor to request attestation reports for VMPL 0.

Severity

CVSS 4.0

4.6 medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
CWE
CWE-290 Authentication Bypass by Spoofing
OWASP Top 10
A07:2025 Authentication Failures
Published
Assigned by
AMD (CNA)
NVD analysis
Awaiting analysis
Record from
the NVD, synced

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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

Attack patterns (CAPEC)

  • CAPEC-21 Exploitation of Trusted Identifiers Likelihood: High · Severity: High
  • CAPEC-22 Exploiting Trust in Client Likelihood: High · Severity: High
  • CAPEC-59 Session Credential Falsification through Prediction Likelihood: High · Severity: High
  • CAPEC-60 Reusing Session IDs (aka Session Replay) Likelihood: High · Severity: High
  • CAPEC-94 Adversary in the Middle (AiTM) Likelihood: High · Severity: Very High
  • CAPEC-459 Creating a Rogue Certification Authority Certificate Likelihood: Medium · Severity: Very High
  • CAPEC-461 Web Services API Signature Forgery Leveraging Hash Function Extension Weakness Severity: High
  • CAPEC-473 Signature Spoof
  • CAPEC-476 Signature Spoofing by Misrepresentation Likelihood: Low · Severity: High
  • CAPEC-667 Bluetooth Impersonation AttackS (BIAS) Likelihood: Medium · Severity: High

The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.

References

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