CVE-2021-26318 Side-channels Related to the x86 PREFETCH Instruction
Attackers can exploit timing and power side channels in AMD CPUs to leak kernel address space information, requiring firmware or microcode updates.
- 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-2021-26318?
CVE-2021-26318 is a medium-severity vulnerability in AMD All supported processors, published on 13 Oct 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A timing and power-based side channel attack leveraging the x86 PREFETCH instructions on some AMD CPUs could potentially result in leaked kernel address space information.
Which versions are affected by CVE-2021-26318?
It affects 5 products.
Products include Amd Athlon Firmware, Amd Athlon Pro Firmware, Amd Epyc Firmware, Amd Ryzen Firmware, Amd Ryzen Pro Firmware.
How do I fix CVE-2021-26318?
Apply the vendor's patch.
Is CVE-2021-26318 being exploited?
There is no known exploitation of CVE-2021-26318 in the wild and no public exploit code.
Sources
Also known as GHSA-8rf7-vpj6-3967.