CVE-2021-26318: AMD Athlon Firmware

Medium severity, CVSS 4.7. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• AMD Athlon Firmware: affected versions not specified
• AMD Athlon Pro Firmware: affected versions not specified
• AMD Epyc Firmware: affected versions not specified
• AMD Ryzen Firmware: affected versions not specified
• AMD Ryzen Pro Firmware: affected versions not specified

Published 2021-10-13. Last modified 2026-06-17.