Description
A time-of-check to time-of-use (TOCTOU) race condition in the AMD SEV Secure Encrypted Virtualization (SEV) firmware could allow an attacker with administrative privileges to bypass security checks on scatter lists, potentially resulting in loss of guest integrity.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| AMD | AMD EPYC™ 9005 Series Processors | — | TurinPI_1.0.0.A |
| AMD | AMD EPYC™ Embedded 9005 Series Processors | — | EmbeddedTurinPI_SP5_1004 |
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.
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 24.04 LTS | amd64-microcode | No fix yet | — |
Advisories 1
- WID-SEC-2026-4471 AMD Prozessor: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 10, 2026