CVE-2026-40668 (GCVE-0-2026-40668)
Vulnerability from cvelistv5 – Published: 2026-11-10 22:11 – Updated: 2026-11-10 22:11
VLAI
EPSS
VEX
Summary
Authentication bypass by spoofing in AMD Secure Encrypted Virtualization (SEV) firmware could allow a malicious hypervisor to request attestation reports for VMPL 0.
Severity
CWE
- CWE-290 - Authentication Bypass by Spoofing
Assigner
AMD
CNA
References
1 reference
Impacted products
10 products
| Vendor | Product | Version | |
|---|---|---|---|
| AMD | AMD EPYC™ 9004 Series Processors |
Unaffected:
GenoaPI_1.0.0.J
|
|
| AMD | AMD EPYC™ 7003 Series Processors |
Unaffected:
MilanPI-SP3_1.0.0.K
|
|
| AMD | AMD EPYC™ 9005 Series Processors |
Unaffected:
TurinPI_1.0.0.B
|
|
| AMD | AMD EPYC™ 8004 Series Processors |
Unaffected:
GenoaPI_1.0.0.J
|
|
| AMD | AMD EPYC™ 8005 Series Processors |
Unaffected:
TurinPI_1.0.0.B
|
|
| AMD | AMD EPYC™ Embedded 7003 Series Processors |
Unaffected:
EmbMilanPI-SP3 1.0.0.E
|
|
| AMD | AMD EPYC™ Embedded 9004 Series Processors (formerly codenamed "Genoa") |
Unaffected:
EmbeddedGenoaPI_1.0.0.E
|
|
| AMD | AMD EPYC™ Embedded 9004 Series Processors (formerly codenamed "Bergamo") |
Unaffected:
EmbeddedGenoaPI_1.0.0.E
|
|
| AMD | AMD EPYC™ Embedded 8004 Series Processors |
Unaffected:
EmbeddedGenoaPI_1.0.0.E
|
|
| AMD | AMD EPYC™ Embedded 9005 Series Processors |
Unaffected:
EmbeddedTurinPI_SP5_1005
|
Date Public
2026-11-10 22:08
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "affected",
"product": "AMD EPYC\u2122 9004 Series Processors",
"vendor": "AMD",
"versions": [
{
"status": "unaffected",
"version": "GenoaPI_1.0.0.J"
}
]
},
{
"defaultStatus": "affected",
"product": "AMD EPYC\u2122 7003 Series Processors",
"vendor": "AMD",
"versions": [
{
"status": "unaffected",
"version": "MilanPI-SP3_1.0.0.K"
}
]
},
{
"defaultStatus": "affected",
"product": "AMD EPYC\u2122 9005 Series Processors",
"vendor": "AMD",
"versions": [
{
"status": "unaffected",
"version": "TurinPI_1.0.0.B"
}
]
},
{
"defaultStatus": "affected",
"product": "AMD EPYC\u2122 8004 Series Processors",
"vendor": "AMD",
"versions": [
{
"status": "unaffected",
"version": "GenoaPI_1.0.0.J"
}
]
},
{
"defaultStatus": "affected",
"product": "AMD EPYC\u2122 8005 Series Processors",
"vendor": "AMD",
"versions": [
{
"status": "unaffected",
"version": "TurinPI_1.0.0.B"
}
]
},
{
"defaultStatus": "affected",
"product": "AMD EPYC\u2122 Embedded 7003 Series Processors",
"vendor": "AMD",
"versions": [
{
"status": "unaffected",
"version": "EmbMilanPI-SP3 1.0.0.E"
}
]
},
{
"defaultStatus": "affected",
"product": "AMD EPYC\u2122 Embedded 9004 Series Processors (formerly codenamed \"Genoa\")",
"vendor": "AMD",
"versions": [
{
"status": "unaffected",
"version": "EmbeddedGenoaPI_1.0.0.E"
}
]
},
{
"defaultStatus": "affected",
"product": "AMD EPYC\u2122 Embedded 9004 Series Processors (formerly codenamed \"Bergamo\")",
"vendor": "AMD",
"versions": [
{
"status": "unaffected",
"version": "EmbeddedGenoaPI_1.0.0.E"
}
]
},
{
"defaultStatus": "affected",
"product": "AMD EPYC\u2122 Embedded 8004 Series Processors",
"vendor": "AMD",
"versions": [
{
"status": "unaffected",
"version": "EmbeddedGenoaPI_1.0.0.E"
}
]
},
{
"defaultStatus": "affected",
"product": "AMD EPYC\u2122 Embedded 9005 Series Processors",
"vendor": "AMD",
"versions": [
{
"status": "unaffected",
"version": "EmbeddedTurinPI_SP5_1005"
}
]
}
],
"datePublic": "2026-11-10T22:08:20.708Z",
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "Authentication bypass by spoofing in AMD Secure Encrypted Virtualization (SEV) firmware could allow a malicious hypervisor to request attestation reports for VMPL 0.\u003cbr\u003e"
}
],
"value": "Authentication bypass by spoofing in AMD Secure Encrypted Virtualization (SEV) firmware could allow a malicious hypervisor to request attestation reports for VMPL 0."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "LOCAL",
"baseScore": 4.6,
"baseSeverity": "MEDIUM",
"privilegesRequired": "HIGH",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "LOW",
"userInteraction": "NONE",
"vectorString": "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",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-290",
"description": "CWE-290 Authentication Bypass by Spoofing",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-11-10T22:11:05.184Z",
"orgId": "b58fc414-a1e4-4f92-9d70-1add41838648",
"shortName": "AMD"
},
"references": [
{
"url": "https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-3038.html"
}
],
"source": {
"discovery": "UNKNOWN"
},
"x_generator": {
"engine": "AMD PSIRT Automation 1.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "b58fc414-a1e4-4f92-9d70-1add41838648",
"assignerShortName": "AMD",
"cveId": "CVE-2026-40668",
"datePublished": "2026-11-10T22:11:05.184Z",
"dateReserved": "2026-04-14T17:04:40.591Z",
"dateUpdated": "2026-11-10T22:11:05.184Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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