Description
Insufficient Granularity of Access Control in SEV firmware could allow a privileged user with a malicious hypervisor to create a SEV-ES guest with an ASID in the range meant for SEV-SNP guests potentially resulting in a partial loss of confidentiality.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| AMD | AMD EPYC™ 9005 Series Processors | — | TurinPI 1.0.0.6 |
| AMD | AMD EPYC™ Embedded 9005 Series Processors | — | EmbTurinPI-SP5_1.0.0.1 |
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 | — |
Advisories 1
- WID-SEC-2026-0381 AMD EPYC, Athlon und Ryzen Prozessoren: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 28, 2026