CVE-2021-26353 Memory corruption in 3rd Gen EPYC

High 7.8 Published 10 May 2022 Updated 3 Aug 2024

Attackers can exploit SMM input validation flaws in AMD EPYC firmware to corrupt memory and potentially execute code or escalate privileges.

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-2021-26353?

CVE-2021-26353 is a high-severity memory corruption vulnerability in Amd Epyc 72f3 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

Failure to validate inputs in SMM may allow an attacker to create a mishandled error leaving the DRTM UApp in a partially initialized state potentially resulting in loss of memory integrity.

Weakness: CWE-665

Which versions are affected by CVE-2021-26353?

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-2021-26353?

No fix has been published for CVE-2021-26353 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-2021-26353 being exploited?

There is no known exploitation of CVE-2021-26353 in the wild and no public exploit code.

All Amd Epyc 72f3 Firmware vulnerabilities

Sources

Also known as GHSA-3972-3jg9-99pp.