What’s Vulnerable › Vulnerabilities

CVE-2021-26316

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% 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-20

Description

Failure to validate the communication buffer and communication service in the BIOS may allow an attacker to tamper with the buffer resulting in potential SMM (System Management Mode) arbitrary code execution.

Affected products

• AMD Athlon 3050Ge Firmware: all versions
• AMD Athlon 3150G Firmware: all versions
• AMD Athlon 3150Ge Firmware: all versions
• AMD Athlon Gold 3150C Firmware: all versions
• AMD Athlon Gold 3150Ge Firmware: all versions
• AMD Athlon Gold 3150U Firmware: all versions
• AMD Athlon Gold Pro 3150G Firmware: all versions
• AMD Athlon Gold Pro 3150Ge Firmware: all versions
• AMD Athlon Pro 3045B Firmware: all versions
• AMD Athlon Pro 3145B Firmware: all versions
• AMD Athlon Silver 3050C Firmware: all versions
• AMD Athlon Silver 3050E Firmware: all versions
• AMD Athlon Silver 3050Ge Firmware: all versions
• AMD Athlon Silver 3050U Firmware: all versions
• AMD Athlon Silver Pro 3125Ge Firmware: all versions
• AMD Epyc 7002 Firmware: before romepi_1.0.0.d — fixed in romepi_1.0.0.d
• AMD Epyc 7003 Firmware: before milanpi-sp3_1.0.0.8 — fixed in milanpi-sp3_1.0.0.8
• AMD Epyc 7232P Firmware: before romepi_1.0.0.d — fixed in romepi_1.0.0.d
• AMD Epyc 7252 Firmware: before romepi_1.0.0.d — fixed in romepi_1.0.0.d
• AMD Epyc 7262 Firmware: before romepi_1.0.0.d — fixed in romepi_1.0.0.d
• AMD Epyc 7272 Firmware: before romepi_1.0.0.d — fixed in romepi_1.0.0.d
• AMD Epyc 7282 Firmware: before romepi_1.0.0.d — fixed in romepi_1.0.0.d
• AMD Epyc 72F3 Firmware: before milanpi-sp3_1.0.0.8 — fixed in milanpi-sp3_1.0.0.8
• AMD Epyc 7302 Firmware: before romepi_1.0.0.d — fixed in romepi_1.0.0.d
• AMD Epyc 7302P Firmware: before romepi_1.0.0.d — fixed in romepi_1.0.0.d
• AMD Epyc 7313 Firmware: before milanpi-sp3_1.0.0.8 — fixed in milanpi-sp3_1.0.0.8
• AMD Epyc 7313P Firmware: before milanpi-sp3_1.0.0.8 — fixed in milanpi-sp3_1.0.0.8
• AMD Epyc 7343 Firmware: before milanpi-sp3_1.0.0.8 — fixed in milanpi-sp3_1.0.0.8
• AMD Epyc 7352 Firmware: before romepi_1.0.0.d — fixed in romepi_1.0.0.d
• AMD Epyc 7373X Firmware: before milanpi-sp3_1.0.0.8 — fixed in milanpi-sp3_1.0.0.8

How to fix

Upgrade to a fixed version: AMD Epyc 7002 Firmware romepi_1.0.0.d; AMD Epyc 7003 Firmware milanpi-sp3_1.0.0.8; AMD Epyc 7232P Firmware romepi_1.0.0.d; AMD Epyc 7252 Firmware romepi_1.0.0.d; AMD Epyc 7262 Firmware romepi_1.0.0.d; AMD Epyc 7272 Firmware romepi_1.0.0.d; AMD Epyc 7282 Firmware romepi_1.0.0.d; AMD Epyc 72F3 Firmware milanpi-sp3_1.0.0.8; AMD Epyc 7302 Firmware romepi_1.0.0.d; AMD Epyc 7302P Firmware romepi_1.0.0.d; AMD Epyc 7313 Firmware milanpi-sp3_1.0.0.8; AMD Epyc 7313P Firmware milanpi-sp3_1.0.0.8. Check the vendor advisory for mitigations.

References

• https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-1031
• https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-1032
• https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-1031
• https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-1032

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