Description
Insufficient Granularity of Access Control in SEV firmware can allow a privileged attacker to create a SEV-ES Guest to attack SNP guest, potentially resulting in a loss of confidentiality.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| AMD | AMD EPYC™ 9004 Series Processors | — | Genoa++_1.0.0.H |
| AMD | AMD EPYC™ 7003 Series Processors | — | MilanPI 1.0.0.H |
| AMD | AMD EPYC™ 9005 Series Processors | — | TurinPI 1.0.0.6 |
| AMD | AMD EPYC™ 8004 Series Processors | — | Genoa++_1.0.0.H |
| AMD | AMD EPYC™ Embedded 7003 Series Processors | — | EmbMilanPI-SP3 v9 1.0.0.C |
| AMD | AMD EPYC™ Embedded 9004 Series Processors (formerly codenamed "Genoa") | — | EmbGenoaPI-SP5 1.0.0.C |
| AMD | AMD EPYC™ Embedded 9005 Series Processors | — | EmbTurinPI-SP5_1.0.0.1 |
| AMD | AMD EPYC™ Embedded 9004 Series Processors (formerly codenamed "Bergamo") | — | EmbGenoaPI-SP5 1.0.0.C |
| AMD | AMD EPYC™ Embedded 8004 Series Processors | — | EmbGenoaPI-SP5 1.0.0.C |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | amd64-microcode | 3.20260923.1 | — |
| Debian 13 | amd64-microcode | No fix yet | — |
| Debian 12 | amd64-microcode | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | amd64-microcode | No fix yet | — |
| Ubuntu 26.04 LTS | amd64-microcode | No fix yet | — |
| Ubuntu 25.10 | amd64-microcode | No fix yet | — |
| Ubuntu 24.04 LTS | amd64-microcode | No fix yet | — |
| Ubuntu 22.04 LTS | amd64-microcode | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | amd64-microcode | No fix yet | — |
| Ubuntu 14.04 LTS | amd64-microcode | No fix yet | — |
| Ubuntu Pro 18.04 LTS | amd64-microcode | No fix yet | — |
| Ubuntu Pro 16.04 LTS | amd64-microcode | No fix yet | — |
Advisories 1
- WID-SEC-2026-0381 AMD EPYC, Athlon und Ryzen Prozessoren: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 28, 2026