CVE-2021-46795 Race condition in Ryzen 3000 Series
A compromised BIOS can trigger a TOCTOU race condition in the TEE OS, leading to out-of-bounds memory reads and potential denial of service.
- 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-2021-46795?
CVE-2021-46795 is a medium-severity vulnerability in Ryzen 3000 Series , published on 10 Jan 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A TOCTOU (time-of-check to time-of-use) vulnerability exists where an attacker may use a compromised BIOS to cause the TEE OS to read memory out of bounds that could potentially result in a denial of service.
Weakness: CWE-367
Which versions are affected by CVE-2021-46795?
It affects 3 products.
Products include Amd Cezannepi-Fp6 Firmware, Amd Comboam4v2 Pi Firmware, Amd Renoirpi-Fp6 Firmware.
How do I fix CVE-2021-46795?
No fix has been published for CVE-2021-46795 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-46795 being exploited?
There is no known exploitation of CVE-2021-46795 in the wild and no public exploit code.
Sources
Also known as GHSA-wfj9-288h-5mpm.