Description
Improper enforcement of the LFENCE serialization property may allow an attacker to bypass speculation barriers and potentially disclose sensitive information, potentially resulting in loss of confidentiality.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| AMD | AMD EPYC™ Series 9004 Processors | — | GenoaPI_1.0.0.E |
| AMD | AMD EPYC™Series 4004 Processors | — | ComboAM5PI_1.0.0.a/ ComboAM5PI_1.1.0.3c/ ComboAM5PI_1.2.0.3 |
| AMD | AMD EPYC™ 8004 Series Processors | — | GenoaPI_1.0.0.E |
| AMD | AMD Instinct™ MI300A Series Processors | — | MI300PI 1.0.0.7 |
| AMD | AMD Ryzen™ Z1 Series Processors | — | ComboAM5PI_1.2.0.3 |
| AMD | AMD Ryzen™ 7040 Series Mobile Processors with Radeon™ Graphics | — | PhoenixPI-FP8-FP7_1.2.0.0 |
| AMD | AMD Ryzen™ 7045 Series Mobile Processors with Radeon™ Graphics | — | DragonRangeFL1_1.0.0.3g |
| AMD | AMD Ryzen™ 9000 Series Desktop Processors | — | ComboAM5PI_1.2.0.3 |
| AMD | AMD Ryzen™ 7000 Series Desktop Processors | — | ComboAM5PI_1.0.0.a |
| AMD | AMD Ryzen™ 8000 Series Desktop Processors | — | ComboAM5PI_1.1.0.3c |
| AMD | AMD Ryzen™ 7000 Series Desktop Processors (formerly codenamed "Raphael") | — | ComboAM5PI_1.3.0.0 |
| AMD | AMD Ryzen™ 8000 Series Desktop Processors (formerly codenamed "Phoenix") | — | ComboAM5PI_1.3.0.0 |
| AMD | AMD EPYC™ Embedded 9004 Series Processors (formerly codenamed "Genoa") | — | EmbGenoaPI-SP5 1.0.0.D |
| AMD | AMD EPYC™ Embedded 8004 Series Processors | — | EmbGenoaPI-SP5 1.0.0.D |
| AMD | AMD EPYC™ Embedded 9004 Series Processors (formerly codenamed "Bergamo") | — | EmbGenoaPI-SP5 1.0.0.D |
| AMD | AMD Ryzen™ Embedded 8000 Series Processors | — | EmbeddedPhoenixPI-FP7r2_1.0.0.3 |
| AMD | AMD Ryzen™ Embedded 7000 Series Processors | — | EmbeddedAM5PI 1.0.0.5 |
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 26.04 LTS | amd64-microcode | 3.20251202.1ubuntu1 | — |
| Ubuntu 25.10 | amd64-microcode | 3.20251202.1ubuntu0.25.10.1 | — |
| Ubuntu 24.04 LTS | amd64-microcode | 3.20251202.1ubuntu0.24.04.1 | — |
| Ubuntu 22.04 LTS | amd64-microcode | No fix yet | — |
| Ubuntu 20.04 LTS | amd64-microcode | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| 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-2026-1482 AMD Prozessor: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 9, 2026