CVE-2021-26397 Memory corruption in 3rd Gen AMD EPYC™

High 7.1 Published 9 May 2023 Updated 28 Jan 2025

An attacker with compromised firmware can corrupt sensitive memory, causing integrity loss or denial of service on AMD EPYC systems.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-26397?

CVE-2021-26397 is a high-severity memory corruption vulnerability in Amd Epyc 72f3 Firmware, published on 9 May 2023. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Insufficient address validation, may allow an attacker with a compromised ABL and UApp to corrupt sensitive memory locations potentially resulting in a loss of integrity or availability.

Which versions are affected by CVE-2021-26397?

It affects 23 products.

Products include Amd Epyc 72f3 Firmware, Amd Epyc 7313 Firmware, Amd Epyc 7313p Firmware, Amd Epyc 7343 Firmware, Amd Epyc 7373x Firmware, Amd Epyc 73f3 Firmware and 17 more.

How do I fix CVE-2021-26397?

No fix has been published for CVE-2021-26397 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-26397 being exploited?

There is no known exploitation of CVE-2021-26397 in the wild and no public exploit code.

All Amd Epyc 72f3 Firmware vulnerabilities

Sources

Also known as GHSA-9xw2-mpxf-37x2.