CVE-2021-26348 Memory corruption in EPYC™ Processors

Medium 5.5 Published 11 May 2022 Updated 16 Sep 2024

An IOMMU TLB flush failure allows IO devices to write to unauthorized memory, compromising system integrity 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: Available

What is CVE-2021-26348?

CVE-2021-26348 is a medium-severity memory corruption vulnerability in Amd Epyc 72f3 Firmware, published on 11 May 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Failure to flush the Translation Lookaside Buffer (TLB) of the I/O memory management unit (IOMMU) may lead an IO device to write to memory it should not be able to access, resulting in a potential loss of integrity.

Which versions are affected by CVE-2021-26348?

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-2021-26348?

Apply the vendor's patch.

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

Is CVE-2021-26348 being exploited?

There is no known exploitation of CVE-2021-26348 in the wild and no public exploit code.

All Amd Epyc 72f3 Firmware vulnerabilities

Sources

Also known as GHSA-8563-gc3w-c38p.