CVE-2021-26379 Memory corruption in 2nd Gen AMD EPYC™

Critical 9.8 Published 9 May 2023 Updated 28 Jan 2025

An attacker can corrupt SMRAM via insufficient input validation in the SMU, leading to privilege escalation and integrity loss on AMD EPYC systems.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-26379?

CVE-2021-26379 is a critical memory corruption vulnerability in Amd Epyc 7232p Firmware, published on 9 May 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Insufficient input validation of mailbox data in the SMU may allow an attacker to coerce the SMU to corrupt SMRAM, potentially leading to a loss of integrity and privilege escalation.

Which versions are affected by CVE-2021-26379?

It affects 48 products.

Products include Amd Epyc 7232p Firmware, Amd Epyc 7252 Firmware, Amd Epyc 7262 Firmware, Amd Epyc 7272 Firmware, Amd Epyc 7282 Firmware, Amd Epyc 72f3 Firmware and 42 more.

How do I fix CVE-2021-26379?

No fix has been published for CVE-2021-26379 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-2021-26379 being exploited?

There is no known exploitation of CVE-2021-26379 in the wild and no public exploit code.

All Amd Epyc 7232p Firmware vulnerabilities

Sources

Also known as GHSA-fqxf-xxpp-6pq8.