What’s Vulnerable › Vulnerabilities

CVE-2021-26328

• Severity: medium (CVSS 4.4 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: 2023-01-11 · updated 2026-06-17
• Weakness: CWE-358

Description

Failure to verify the mode of CPU execution at the time of SNP_INIT may lead to a potential loss of memory integrity for SNP guests.

Affected products

• AMD Epyc 7003 Firmware: before milanpi_1.0.0.8 — fixed in milanpi_1.0.0.8
• AMD Epyc 72F3 Firmware: before milanpi_1.0.0.8 — fixed in milanpi_1.0.0.8
• AMD Epyc 7313 Firmware: before milanpi_1.0.0.8 — fixed in milanpi_1.0.0.8
• AMD Epyc 7313P Firmware: before milanpi_1.0.0.8 — fixed in milanpi_1.0.0.8
• AMD Epyc 7343 Firmware: before milanpi_1.0.0.8 — fixed in milanpi_1.0.0.8
• AMD Epyc 7373X Firmware: before milanpi_1.0.0.8 — fixed in milanpi_1.0.0.8
• AMD Epyc 73F3 Firmware: before milanpi_1.0.0.8 — fixed in milanpi_1.0.0.8
• AMD Epyc 7413 Firmware: before milanpi_1.0.0.8 — fixed in milanpi_1.0.0.8
• AMD Epyc 7443 Firmware: before milanpi_1.0.0.8 — fixed in milanpi_1.0.0.8
• AMD Epyc 7443P Firmware: before milanpi_1.0.0.8 — fixed in milanpi_1.0.0.8
• AMD Epyc 7453 Firmware: before milanpi_1.0.0.8 — fixed in milanpi_1.0.0.8
• AMD Epyc 74F3 Firmware: before milanpi_1.0.0.8 — fixed in milanpi_1.0.0.8
• AMD Epyc 7513 Firmware: before milanpi_1.0.0.8 — fixed in milanpi_1.0.0.8
• AMD Epyc 7543 Firmware: before milanpi_1.0.0.8 — fixed in milanpi_1.0.0.8
• AMD Epyc 7543P Firmware: before milanpi_1.0.0.8 — fixed in milanpi_1.0.0.8
• AMD Epyc 7573X Firmware: before milanpi_1.0.0.8 — fixed in milanpi_1.0.0.8
• AMD Epyc 75F3 Firmware: before milanpi_1.0.0.8 — fixed in milanpi_1.0.0.8
• AMD Epyc 7643 Firmware: before milanpi_1.0.0.8 — fixed in milanpi_1.0.0.8
• AMD Epyc 7663 Firmware: before milanpi_1.0.0.8 — fixed in milanpi_1.0.0.8
• AMD Epyc 7713 Firmware: before milanpi_1.0.0.8 — fixed in milanpi_1.0.0.8
• AMD Epyc 7713P Firmware: before milanpi_1.0.0.8 — fixed in milanpi_1.0.0.8
• AMD Epyc 7743 Firmware: before milanpi_1.0.0.8 — fixed in milanpi_1.0.0.8
• AMD Epyc 7763 Firmware: before milanpi_1.0.0.8 — fixed in milanpi_1.0.0.8
• AMD Epyc 7773X Firmware: before milanpi_1.0.0.8 — fixed in milanpi_1.0.0.8

How to fix

Upgrade to a fixed version: AMD Epyc 7003 Firmware milanpi_1.0.0.8; AMD Epyc 72F3 Firmware milanpi_1.0.0.8; AMD Epyc 7313 Firmware milanpi_1.0.0.8; AMD Epyc 7313P Firmware milanpi_1.0.0.8; AMD Epyc 7343 Firmware milanpi_1.0.0.8; AMD Epyc 7373X Firmware milanpi_1.0.0.8; AMD Epyc 73F3 Firmware milanpi_1.0.0.8; AMD Epyc 7413 Firmware milanpi_1.0.0.8; AMD Epyc 7443 Firmware milanpi_1.0.0.8; AMD Epyc 7443P Firmware milanpi_1.0.0.8; AMD Epyc 7453 Firmware milanpi_1.0.0.8; AMD Epyc 74F3 Firmware milanpi_1.0.0.8. Check the vendor advisory for mitigations.

References

• https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-1032
• https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-1032

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