CVE-2021-26323 Memory corruption in 3rd Gen AMD EPYC™

High 7.8 Published 16 Nov 2021 Updated 16 Sep 2024

Attackers can compromise memory integrity by sending invalid SEV commands while Secure Nested Paging is active on AMD EPYC processors.

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-2021-26323?

CVE-2021-26323 is a high-severity memory corruption vulnerability in Amd Epyc 7232p Firmware, published on 16 Nov 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Failure to validate SEV Commands while SNP is active may result in a potential impact to memory integrity.

Weakness: CWE-20

Which versions are affected by CVE-2021-26323?

It affects 20 products.

Products include Amd Epyc 7232p Firmware, Amd Epyc 72f3 Firmware, Amd Epyc 7313 Firmware, Amd Epyc 7313p Firmware, Amd Epyc 7343 Firmware, Amd Epyc 73f3 Firmware and 14 more.

How do I fix CVE-2021-26323?

No fix has been published for CVE-2021-26323 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-2021-26323 being exploited?

There is no known exploitation of CVE-2021-26323 in the wild and no public exploit code.

All Amd Epyc 7232p Firmware vulnerabilities

Sources

Also known as GHSA-vvf9-v6jp-95g2.