Floating Point Divider State Sampling on AMD CPUs
Summary
Researchers shared with AMD a report titled “TREVEX: A Black-Box Detection Framework For Data-Flow Transient Execution Vulnerabilities”. The authors reported Floating Point Divider State Sampling (FP-DSS), a transient execution vulnerability, affecting multiple generations of AMD CPUs. They noted this bug could enable a user-privileged attacker to leak sensitive data via floating-point divisor units.
Based on the researchers’ report, AMD assesses that the issue affects systems with SMT enabled as well as systems without SMT, and that the potential information-leakage risk in real-world deployments appears limited due to the constrained nature of the data involved and the relatively uncommon use of floating-point operations in privileged code.
CVE Details
Refer to Glossary for explanation of terms
| CVE | CVE Description | CVSS Score |
| CVE-2025-54505 | A transient execution vulnerability within AMD CPUs may allow a local, user-privileged attacker to leak data via the floating-point divisor unit, potentially resulting in a loss of confidentiality. | 2.0 (Low) CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N |
Affected Products and Mitigation
For affected Zen/Zen+ processors, the issue may be mitigated at the OS level by setting bit 9 of MSR C001_1028 to 1. AMD is working with upstream Linux maintainers to support integration of this mitigation. AMD recommends users should contact their OS vendor regarding available mitigations.
- AMD EPYC™ 7001 Series Processors
- AMD EPYC™ Embedded 3000 Series Processors
- AMD Athlon™ 3000 Series Processors with Radeon™ Graphics
- AMD Ryzen™ 3000 Series Processors with Radeon™ Graphics
- AMD Ryzen™ PRO 3000 Series Processors with Radeon™ Vega Graphics
Acknowledgement
AMD thanks Daniel Weber, Fabian Thomas, Leon Trampert, Ruiyi Zhang, Lukas Gerlach, and Michael Schwarz for reporting this issue and engaging in coordinated vulnerability disclosure.
Revisions
| Revision Date | Description |
| 2026-04-17 | Initial publication |
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