AMD Secure Encrypted Virtualization (SEV) Vulnerability
Summary
A malicious hypervisor may manipulate Memory Mapped I/O (MMIO) routing, potentially compromising SEV-SNP integrity in some AMD processors.
CVE Details
Refer to Glossary for explanation of terms
CVE |
CVE Description |
CVSS Base Score |
CVE-2026-0462 |
Insufficient Granularity of Access Control in AMD Secure Encrypted Virtualization (SEV) firmware could allow a malicious hypervisor to potentially redirect access to MMIO memory resulting in loss of guest memory integrity. |
5.9 CWE-1220: Insufficient Granularity of Access Control |
Specific CVSS scores may change subject to your implementation. We encourage you to calculate CVSS scores independently for your system.
Affected Products and Mitigation
AMD plans to release to the Original Equipment Manufacturers (OEM) the Platform Initialization (PI) firmware versions on the target dates listed below. Please contact your OEM for the BIOS update specific to your product(s).
*Note: Products believed to not be affected by the listed CVEs are not included.AMD EPYC™ Series Processors
AMD EPYC™ Series Processors
Product |
CVE ID |
Platform Initialization (PI) Mitigation |
PI Release Date |
SEV FW Mitigation |
SEV FW Release Date |
Mitigation Bit |
TCB Values for SNP Attestation |
AMD EPYC™ 7003 Series Processors |
CVE-2026-0462 |
MilanPI-SP3_1.0.0.L |
Target release planned for Dec'26 |
1.3A.03 |
2026-08-12 |
Mitigation Bit=8 |
TCB[SNP]=0x1F |
AMD EPYC™ 8004 Series Processors |
CVE-2026-0462 |
GenoaPI_1.0.0.K |
Target release planned for Dec'26 |
1.3A.4 |
2026-08-12 |
Mitigation Bit=6 |
TCB[SNP]=0x1E |
AMD EPYC™ 8005 Series Processors |
CVE-2026-0462 |
TurinPI_1.0.0.C |
Target release planned for Dec'26 |
1.3A.0A |
2026-08-12 |
Mitigation Bit=12 |
TCB[SNP]=0x8 |
AMD EPYC™ 9004 Series Processors |
CVE-2026-0462 |
GenoaPI_1.0.0.K |
Target release planned for Dec'26 |
1.3A.4 |
2026-08-12 |
Mitigation Bit=6 |
TCB[SNP]=0x1E |
AMD EPYC™ 9005 Series Processors |
CVE-2026-0462 |
TurinPI_1.0.0.C |
Target release planned for Dec'26 |
1.3A.0A |
2026-08-12 |
Mitigation Bit=12 |
TCB[SNP]=0x8 |
SEV Table
CVE ID |
SEV |
SEV-ES |
SEV-SNP |
CVE-2026-0462 |
N |
N |
Y |
AMD EPYC™ Embedded Series Processors
Product |
CVE ID |
Mitigation |
Mitigation Release Date |
AMD EPYC™ Embedded 7003 Series Processors |
CVE-2026-0462 |
Version TBD |
Target release planned for Feb'27 |
AMD EPYC™ Embedded 8004 Series Processors |
CVE-2026-0462 |
Version TBD |
Target release planned for Feb'27 |
AMD EPYC™ Embedded 9004 Series Processors |
CVE-2026-0462 |
Version TBD |
Target release planned for Feb'27 |
AMD EPYC™ Embedded 9004 Series Processors |
CVE-2026-0462 |
Version TBD |
Target release planned for Feb'27 |
AMD EPYC™ Embedded 9005 Series Processors |
CVE-2026-0462 |
Version TBD |
Target release planned for Feb'27 |
Acknowledgement
AMD thanks the following for reporting and engaging in coordinated vulnerability disclosure:
- External Researchers: Chris Wech, Philipp Giersfeld, Benedict Schlüter, and Shweta Shinde ETH Zurich: CVE-2026-0462
Revisions
| Revision Date | Description |
| 2026-11-10 | Initial version |
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