CVE-2021-26339: AMD Epyc 72f3 Firmware

Medium severity, CVSS 5.5. EPSS: 0.3% chance of exploitation in the next 30 days.

A bug in AMD CPU’s core logic may allow for an attacker, using specific code from an unprivileged VM, to trigger a CPU core hang resulting in a potential denial of service. AMD believes the specific code includes a specific x86 instruction sequence that would not be generated by compilers.

Affected products

AMD Epyc 72f3 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
AMD Epyc 7313 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
AMD Epyc 7313p Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
AMD Epyc 7343 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
AMD Epyc 7373x Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
AMD Epyc 73f3 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
AMD Epyc 7413 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
AMD Epyc 7443 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
AMD Epyc 7443p Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
AMD Epyc 7453 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
AMD Epyc 7473x Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
AMD Epyc 74f3 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
AMD Epyc 7513 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
AMD Epyc 7543 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
AMD Epyc 7543p Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
AMD Epyc 7573x Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
AMD Epyc 75f3 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
AMD Epyc 7643 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
AMD Epyc 7663 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
AMD Epyc 7713 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
AMD Epyc 7713p Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
AMD Epyc 7763 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
AMD Epyc 7773x Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
AMD Ryzen 3 2200u Firmware: affected versions not specified
AMD Ryzen 3 2300u Firmware: affected versions not specified
and 59 more

Published 2022-05-11. Last modified 2026-06-17.