The Promontory chipset, as used in AMD Ryzen and Ryzen Pro platforms, has a backdoor in firmware, aka CHIMERA-FW.
Priority MEDIUM 42Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA.
Summary
The Promontory chipset, as used in AMD Ryzen and Ryzen Pro platforms, has a backdoor in firmware, aka CHIMERA-FW.
Why it matters now
EPSS 0.0175 77th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:amd:ryzen_pro_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | AMD |
| cpe:2.3:h:amd:ryzen_pro:-:*:*:*:*:*:*:* | not specified by NVD | Running on | AMD |
| cpe:2.3:o:amd:ryzen_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | AMD |
| cpe:2.3:h:amd:ryzen:-:*:*:*:*:*:*:* | not specified by NVD | Running on | AMD |
- cpe:2.3:o:amd:ryzen_pro_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·AMD
- cpe:2.3:h:amd:ryzen_pro:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·AMD
- cpe:2.3:o:amd:ryzen_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·AMD
- cpe:2.3:h:amd:ryzen:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·AMD
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2018-8934
- 2026-10-03 Alias added: GHSA-jf6h-g8vv-jx4q
References
More AMD Ryzen Firmware vulnerabilities
- TI-2018-06474 The AMD EPYC Server, Ryzen, Ryzen Pro, and Ryzen Mobile processor chips allow Platform… CVSS 3.0CRITICAL 9.0
- TI-2018-06473 The Promontory chipset, as used in AMD Ryzen and Ryzen Pro platforms, has a backdoor in the ASIC, aka CHIMERA-HW. CVSS 3.0CRITICAL 9.0
- TI-2018-06470 The AMD Ryzen and Ryzen Pro processor chips have insufficient access control for the… CVSS 3.0CRITICAL 9.0
- TI-2018-06469 The AMD Ryzen, Ryzen Pro, and Ryzen Mobile processor chips have insufficient access… CVSS 3.0CRITICAL 9.0
- TI-2018-06468 The AMD EPYC Server, Ryzen, Ryzen Pro, and Ryzen Mobile processor chips have insufficient… CVSS 3.0CRITICAL 9.0
- TI-2021-08146 Side-channels Related to the x86 PREFETCH Instruction CVSS 3.1MEDIUM 4.7
Sources
- CVE-2018-8934 · CVE Program
- CVE-2018-8934 · NVD
- FIRST EPSS
- GHSA-jf6h-g8vv-jx4q · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences