CVE-2021-26336: AMD Epyc 7002 Firmware

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

Insufficient bounds checking in System Management Unit (SMU) may cause invalid memory accesses/updates that could result in SMU hang and subsequent failure to service any further requests from other components.

Affected products

• AMD Epyc 7002 Firmware: before romepi-sp3_1.0.0.c (fixed in romepi-sp3_1.0.0.c)
• AMD Epyc 7003 Firmware: before milanpi-sp3_1.0.0.4 (fixed in milanpi-sp3_1.0.0.4)
• 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)
• and 70 more

Published 2021-11-16. Last modified 2026-06-17.