{"affected":[{"defaultStatus":"affected","product":"AMD EPYC™ 9004 Series Processors","source":"CNA: AMD","vendor":"AMD","versions":[{"status":"unaffected","version":"GenoaPI_1.0.0.J"}]},{"defaultStatus":"affected","product":"AMD EPYC™ 7003 Series Processors","source":"CNA: AMD","vendor":"AMD","versions":[{"status":"unaffected","version":"MilanPI-SP3_1.0.0.K"}]},{"defaultStatus":"affected","product":"AMD EPYC™ 9005 Series Processors","source":"CNA: AMD","vendor":"AMD","versions":[{"status":"unaffected","version":"TurinPI_1.0.0.B"}]},{"defaultStatus":"affected","product":"AMD EPYC™ 8004 Series Processors","source":"CNA: AMD","vendor":"AMD","versions":[{"status":"unaffected","version":"GenoaPI_1.0.0.J"}]},{"defaultStatus":"affected","product":"AMD EPYC™ 8005 Series Processors","source":"CNA: AMD","vendor":"AMD","versions":[{"status":"unaffected","version":"TurinPI_1.0.0.B"}]},{"defaultStatus":"affected","product":"AMD EPYC™ Embedded 7003 Series Processors","source":"CNA: AMD","vendor":"AMD","versions":[{"status":"unaffected","version":"EmbMilanPI-SP3 1.0.0.E"}]},{"defaultStatus":"affected","product":"AMD EPYC™ Embedded 9004  Series Processors (formerly codenamed \"Genoa\")","source":"CNA: AMD","vendor":"AMD","versions":[{"status":"unaffected","version":"EmbeddedGenoaPI_1.0.0.E"}]},{"defaultStatus":"affected","product":"AMD EPYC™ Embedded 9004 Series Processors (formerly codenamed \"Bergamo\")","source":"CNA: AMD","vendor":"AMD","versions":[{"status":"unaffected","version":"EmbeddedGenoaPI_1.0.0.E"}]},{"defaultStatus":"affected","product":"AMD EPYC™ Embedded 8004 Series Processors","source":"CNA: AMD","vendor":"AMD","versions":[{"status":"unaffected","version":"EmbeddedGenoaPI_1.0.0.E"}]},{"defaultStatus":"affected","product":"AMD EPYC™ Embedded 9005 Series Processors","source":"CNA: AMD","vendor":"AMD","versions":[{"status":"unaffected","version":"EmbeddedTurinPI_SP5_1005"}]}],"cveId":"CVE-2026-40668","cwes":["CWE-290"],"description":"Authentication bypass by spoofing in AMD Secure Encrypted Virtualization (SEV) firmware could allow a malicious hypervisor to request attestation reports for VMPL 0.","epss":{"date":"2026-11-12","percentile":0.09712,"score":0.00198},"exploits":[],"kev":null,"metrics":[{"score":4.6,"severity":"medium","source":"CNA: AMD","vector":"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","version":"4.0"},{"score":4.6,"severity":"medium","source":"NVD: psirt@amd.com","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","version":"4.0"}],"modifiedAt":1794527786872,"publishedAt":1794348665184,"references":[{"source":"CNA: AMD","tags":[],"url":"https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-3038.html"},{"source":"psirt@amd.com","tags":[],"url":"https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-3038.html"}],"remediation":[],"revision":"4637b2ef2f8f117d0c7887b6b7e0f2c5c7e743d052f64fdd38fa3174ad9cd473","sources":[{"modifiedAt":1794527786872,"name":"CNA: AMD","retrievedAt":1794528571768,"url":"https://www.cve.org/CVERecord?id=CVE-2026-40668"},{"modifiedAt":1794502713260,"name":"NVD","retrievedAt":1794507448696,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40668"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794528587389,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-40668"}],"ssvc":{"assessedAt":1794527769461,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"CVE-2026-40668","updatedAt":1794528587389}