Time-of-check time-of-use race condition in AMD Ryzen 5000 Series
Priority LOW 21CWE-367Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.
Summary
A TOCTOU (time-of-check to time-of-use) vulnerability exists where an attacker may use a compromised BIOS to cause the TEE OS to read memory out of bounds that could potentially result in a denial of service.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00141 3rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| AMD | Ryzen 5000 Series | various and later | — | No fix listed | CNA |
| AMD | Ryzen 3000 Series | various | — | No fix listed | CNA |
- Ryzen 5000 Series VendorAMD Affected various and later Fixed in — No fix listed CNA
- Ryzen 3000 Series VendorAMD Affected various Fixed in — No fix listed CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:amd:comboam4v2_pi_firmware:*:*:*:*:*:*:*:* | before 1.2.0.5 | Vulnerable | AMD |
| cpe:2.3:h:amd:comboam4v2_pi:-:*:*:*:*:*:*:* | not specified by NVD | Running on | AMD |
| cpe:2.3:o:amd:renoirpi-fp6_firmware:*:*:*:*:*:*:*:* | before 1.0.0.7 | Vulnerable | AMD |
| cpe:2.3:o:amd:cezannepi-fp6_firmware:*:*:*:*:*:*:*:* | before 1.0.0.6 | Vulnerable | AMD |
| cpe:2.3:h:amd:cezannepi-fp6:-:*:*:*:*:*:*:* | not specified by NVD | Running on | AMD |
- cpe:2.3:o:amd:comboam4v2_pi_firmware:*:*:*:*:*:*:*:* Versions before 1.2.0.5 Vulnerable ·AMD
- cpe:2.3:h:amd:comboam4v2_pi:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·AMD
- cpe:2.3:o:amd:renoirpi-fp6_firmware:*:*:*:*:*:*:*:* Versions before 1.0.0.7 Vulnerable ·AMD
- cpe:2.3:o:amd:cezannepi-fp6_firmware:*:*:*:*:*:*:*:* Versions before 1.0.0.6 Vulnerable ·AMD
- cpe:2.3:h:amd:cezannepi-fp6:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·AMD
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
Not affected: 4 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2021-46795
- 2026-10-03 Alias added: GHSA-wfj9-288h-5mpm
References
Sources
- CVE-2021-46795 · CVE Program
- CVE-2021-46795 · NVD
- FIRST EPSS
- GHSA-wfj9-288h-5mpm · GitHub Advisory Database · CC BY 4.0
- CVE-2021-46795 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences