CVE-2021-26406 Denial of service in 1st Gen AMD EPYC™ Processors
Insufficient validation in AMD SEV certificate parsing allows attackers to crash the host, causing denial of service on affected AMD processors.
- 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-2021-26406?
CVE-2021-26406 is a high-severity denial of service 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 validation in parsing Owner's Certificate Authority (OCA) certificates in SEV (AMD Secure Encrypted Virtualization) and SEV-ES user application can lead to a host crash potentially resulting in denial of service.
Which versions are affected by CVE-2021-26406?
It affects 40 products.
Products include Amd Epyc 7232p Firmware, Amd Epyc 7251 Firmware, Amd Epyc 7252 Firmware, Amd Epyc 7261 Firmware, Amd Epyc 7262 Firmware, Amd Epyc 7272 Firmware and 34 more.
How do I fix CVE-2021-26406?
No fix has been published for CVE-2021-26406 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-26406 being exploited?
There is no known exploitation of CVE-2021-26406 in the wild and no public exploit code.
Other vulnerabilities in Amd Epyc 7232p Firmware
Sources
Also known as GHSA-r2pm-cwg9-cpwh.