CVE-2021-26318
MEDIUMCVSS 4.7/10EPSS 0.32%
Last modified
CVE-2021-26318 is a medium-severity vulnerability rated 4.7/10 on the CVSS scale. A timing and power-based side channel attack leveraging the x86 PREFETCH instructions on some AMD CPUs could potentially result in leaked kernel address space information.. EPSS estimates a 0.32% chance of exploitation in the next 30 days.
Description
A timing and power-based side channel attack leveraging the x86 PREFETCH instructions on some AMD CPUs could potentially result in leaked kernel address space information.
Metrics
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Amd | Athlon Firmware | All versions |
| Amd | Athlon Pro Firmware | All versions |
| Amd | Epyc Firmware | All versions |
| Amd | Ryzen Firmware | All versions |
| Amd | Ryzen Pro Firmware | All versions |
References
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-26318?
A timing and power-based side channel attack leveraging the x86 PREFETCH instructions on some AMD CPUs could potentially result in leaked kernel address space information.
How severe is CVE-2021-26318?
CVE-2021-26318 has a CVSS score of 4.7/10 (MEDIUM severity). The EPSS model estimates a 0.32% probability of exploitation in the next 30 days.
How do I fix CVE-2021-26318?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-26318?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST