What’s Vulnerable › Vulnerabilities

CVE-2021-26340

• Severity: high (CVSS 8.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-12-10 · updated 2026-06-17

Description

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: all versions
• AMD Epyc 7232P Firmware: all versions
• AMD Epyc 7251 Firmware: all versions
• AMD Epyc 7252 Firmware: all versions
• AMD Epyc 7261 Firmware: all versions
• AMD Epyc 7262 Firmware: all versions
• AMD Epyc 7272 Firmware: all versions
• AMD Epyc 7281 Firmware: all versions
• AMD Epyc 7282 Firmware: all versions
• AMD Epyc 72F3 Firmware: all versions
• AMD Epyc 7301 Firmware: all versions
• AMD Epyc 7302 Firmware: all versions
• AMD Epyc 7302P Firmware: all versions
• AMD Epyc 7313 Firmware: all versions
• AMD Epyc 7313P Firmware: all versions
• AMD Epyc 7343 Firmware: all versions
• AMD Epyc 7351 Firmware: all versions
• AMD Epyc 7351P Firmware: all versions
• AMD Epyc 7352 Firmware: all versions
• AMD Epyc 7371 Firmware: all versions
• AMD Epyc 73F3 Firmware: all versions
• AMD Epyc 7401 Firmware: all versions
• AMD Epyc 7401P Firmware: all versions
• AMD Epyc 7402 Firmware: all versions
• AMD Epyc 7402P Firmware: all versions
• AMD Epyc 7413 Firmware: all versions
• AMD Epyc 7443 Firmware: all versions
• AMD Epyc 7443P Firmware: all versions
• AMD Epyc 7451 Firmware: all versions
• AMD Epyc 7452 Firmware: all versions

References

• https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1023
• https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1023

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