CVE-2021-26320 Denial of service in 1st Gen AMD EPYC™
A local authenticated attacker can cause a denial of service on the AMD PSP by exploiting insufficient validation in the SEV Firmware.
- 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-2021-26320?
CVE-2021-26320 is a medium-severity denial of service 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
Insufficient validation of the AMD SEV Signing Key (ASK) in the SEND_START command in the SEV Firmware may allow a local authenticated attacker to perform a denial of service of the PSP
Weakness: CWE-295
Which versions are affected by CVE-2021-26320?
It affects 57 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 51 more.
How do I fix CVE-2021-26320?
No fix has been published for CVE-2021-26320 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-2021-26320 being exploited?
There is no known exploitation of CVE-2021-26320 in the wild and no public exploit code.
Other vulnerabilities in Amd Epyc 7232p Firmware
Sources
Also known as GHSA-v3rf-32hp-hfhf.