CVE-2021-26340: AMD Epyc 7001 Firmware

High severity, CVSS 8.4. EPSS: 0.2% chance of exploitation in the next 30 days.

A malicious hypervisor in conjunction with an unprivileged attacker process inside an SEV/SEV-ES guest VM may fail to flush the Translation Lookaside Buffer (TLB) resulting in unexpected behavior inside the virtual machine (VM).

Affected products

• AMD Epyc 7001 Firmware: affected versions not specified
• AMD Epyc 7232p Firmware: affected versions not specified
• AMD Epyc 7251 Firmware: affected versions not specified
• AMD Epyc 7252 Firmware: affected versions not specified
• AMD Epyc 7261 Firmware: affected versions not specified
• AMD Epyc 7262 Firmware: affected versions not specified
• AMD Epyc 7272 Firmware: affected versions not specified
• AMD Epyc 7281 Firmware: affected versions not specified
• AMD Epyc 7282 Firmware: affected versions not specified
• AMD Epyc 72f3 Firmware: affected versions not specified
• AMD Epyc 7301 Firmware: affected versions not specified
• AMD Epyc 7302 Firmware: affected versions not specified
• AMD Epyc 7302p Firmware: affected versions not specified
• AMD Epyc 7313 Firmware: affected versions not specified
• AMD Epyc 7313p Firmware: affected versions not specified
• AMD Epyc 7343 Firmware: affected versions not specified
• AMD Epyc 7351 Firmware: affected versions not specified
• AMD Epyc 7351p Firmware: affected versions not specified
• AMD Epyc 7352 Firmware: affected versions not specified
• AMD Epyc 7371 Firmware: affected versions not specified
• AMD Epyc 73f3 Firmware: affected versions not specified
• AMD Epyc 7401 Firmware: affected versions not specified
• AMD Epyc 7401p Firmware: affected versions not specified
• AMD Epyc 7402 Firmware: affected versions not specified
• AMD Epyc 7402p Firmware: affected versions not specified
• and 80 more

Published 2021-12-10. Last modified 2026-06-17.