What’s Vulnerable › Vulnerabilities

CVE-2021-26338

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-11-16 · updated 2026-06-17
• Weakness: CWE-284

Description

Improper access controls in System Management Unit (SMU) may allow for an attacker to override performance control tables located in DRAM resulting in a potential lack of system resources.

Affected products

• AMD Epyc 7232P Firmware: before romepi-sp3_1.0.0.c — fixed in romepi-sp3_1.0.0.c
• AMD Epyc 7252 Firmware: before romepi-sp3_1.0.0.c — fixed in romepi-sp3_1.0.0.c
• AMD Epyc 7262 Firmware: before romepi-sp3_1.0.0.c — fixed in romepi-sp3_1.0.0.c
• AMD Epyc 7272 Firmware: before romepi-sp3_1.0.0.c — fixed in romepi-sp3_1.0.0.c
• AMD Epyc 7282 Firmware: before romepi-sp3_1.0.0.c — fixed in romepi-sp3_1.0.0.c
• AMD Epyc 72F3 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
• AMD Epyc 7302 Firmware: before romepi-sp3_1.0.0.c — fixed in romepi-sp3_1.0.0.c
• AMD Epyc 7302P Firmware: before romepi-sp3_1.0.0.c — fixed in romepi-sp3_1.0.0.c
• AMD Epyc 7313 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
• AMD Epyc 7313P Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
• AMD Epyc 7343 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
• AMD Epyc 7352 Firmware: before romepi-sp3_1.0.0.c — fixed in romepi-sp3_1.0.0.c
• AMD Epyc 73F3 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
• AMD Epyc 7402 Firmware: before romepi-sp3_1.0.0.c — fixed in romepi-sp3_1.0.0.c
• AMD Epyc 7402P Firmware: before romepi-sp3_1.0.0.c — fixed in romepi-sp3_1.0.0.c
• AMD Epyc 7413 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
• AMD Epyc 7443 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
• AMD Epyc 7443P Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
• AMD Epyc 7452 Firmware: before romepi-sp3_1.0.0.c — fixed in romepi-sp3_1.0.0.c
• AMD Epyc 7453 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
• AMD Epyc 74F3 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
• AMD Epyc 7502 Firmware: before romepi-sp3_1.0.0.c — fixed in romepi-sp3_1.0.0.c
• AMD Epyc 7502P Firmware: before romepi-sp3_1.0.0.c — fixed in romepi-sp3_1.0.0.c
• AMD Epyc 7513 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
• AMD Epyc 7532 Firmware: before romepi-sp3_1.0.0.c — fixed in romepi-sp3_1.0.0.c
• AMD Epyc 7542 Firmware: before romepi-sp3_1.0.0.c — fixed in romepi-sp3_1.0.0.c
• AMD Epyc 7543 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
• AMD Epyc 7543P Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
• AMD Epyc 7552 Firmware: before romepi-sp3_1.0.0.c — fixed in romepi-sp3_1.0.0.c
• AMD Epyc 75F3 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4

How to fix

Upgrade to a fixed version: AMD Epyc 7232P Firmware romepi-sp3_1.0.0.c; AMD Epyc 7252 Firmware romepi-sp3_1.0.0.c; AMD Epyc 7262 Firmware romepi-sp3_1.0.0.c; AMD Epyc 7272 Firmware romepi-sp3_1.0.0.c; AMD Epyc 7282 Firmware romepi-sp3_1.0.0.c; AMD Epyc 72F3 Firmware milanpi-sp3_1.0.0.4; AMD Epyc 7302 Firmware romepi-sp3_1.0.0.c; AMD Epyc 7302P Firmware romepi-sp3_1.0.0.c; AMD Epyc 7313 Firmware milanpi-sp3_1.0.0.4; AMD Epyc 7313P Firmware milanpi-sp3_1.0.0.4; AMD Epyc 7343 Firmware milanpi-sp3_1.0.0.4; AMD Epyc 7352 Firmware romepi-sp3_1.0.0.c. Check the vendor advisory for mitigations.

References

• https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1021
• https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1021

Get alerted when CVE-2021-26338 or the next vulnerability affects your stack