CVE-2021-26349 Security feature bypass in EPYC™ Processors
An attacker can trick an SEV-SNP guest VM into trusting a dishonest Migration Agent by exploiting a failure to assign new report IDs.
- 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-2021-26349?
CVE-2021-26349 is a medium-severity 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 assign a new report ID to an imported guest may potentially result in an SEV-SNP guest VM being tricked into trusting a dishonest Migration Agent (MA).
Which versions are affected by CVE-2021-26349?
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-2021-26349?
Apply the vendor's patch.
Is CVE-2021-26349 being exploited?
There is no known exploitation of CVE-2021-26349 in the wild and no public exploit code.
Other vulnerabilities in Amd Epyc 72f3 Firmware
Sources
Also known as GHSA-x34m-wh8g-2mpf.