CVE-2021-26370 Memory corruption in 2nd Gen AMD EPYC™

High 7.1 Published 10 May 2022 Updated 16 Sep 2024

A malicious application can overwrite bootloader memory via improper validation, compromising integrity and availability of 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-2021-26370?

CVE-2021-26370 is a high-severity memory corruption vulnerability in Amd Epyc 7232p Firmware, published on 10 May 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Improper validation of destination address in SVC_LOAD_FW_IMAGE_BY_INSTANCE and SVC_LOAD_BINARY_BY_ATTRIB in a malicious UApp or ABL may allow an attacker to overwrite arbitrary bootloader memory with SPI ROM contents resulting in a loss of integrity and availability.

Weakness: CWE-20

Which versions are affected by CVE-2021-26370?

It affects 49 products.

Products include Amd Epyc 7002 Firmware, Amd Epyc 7232p Firmware, Amd Epyc 7252 Firmware, Amd Epyc 7262 Firmware, Amd Epyc 7272 Firmware, Amd Epyc 7282 Firmware and 43 more.

How do I fix CVE-2021-26370?

No fix has been published for CVE-2021-26370 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-2021-26370 being exploited?

There is no known exploitation of CVE-2021-26370 in the wild and no public exploit code.

All Amd Epyc 7232p Firmware vulnerabilities

Sources

Also known as GHSA-9hr4-cwvw-3xm2.