CVE-2026-31628 x86/CPU: Fix FPDSS on Zen1
An attacker can leak partial hardware divider results from previous operations on Zen1 CPUs, potentially exposing sensitive data.
- 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-2026-31628?
CVE-2026-31628 is a medium-severity vulnerability in Linux kernel, published on 24 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
x86/CPU: Fix FPDSS on Zen1
Zen1's hardware divider can leave, under certain circumstances, partial results from previous operations. Those results can be leaked by another, attacker thread.
Fix that with a chicken bit.
Which versions are affected by CVE-2026-31628?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-31628?
Apply the vendor's patch.
Is CVE-2026-31628 being exploited?
There is no known exploitation of CVE-2026-31628 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-83831, BELL-CVE-2026-31628, DEBIAN-CVE-2026-31628, GHSA-9grw-fpvr-3468, ROOT-OS-DEBIAN-11-CVE-2026-31628, ROOT-OS-DEBIAN-12-CVE-2026-31628 and 4 more.