CVE-2026-31628: x86/CPU: Fix FPDSS on Zen1
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.6.137.1-1 - Upgrade
Upgrade
debian/linuxto a version that resolves this vulnerability.Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.113-1Fixed in 7.2.12-1Fixed in 7.2.13-1
Event History
Frequently Asked Questions
What is the severity of CVE-2026-31628?
CVE-2026-31628 has not been assigned a specific severity rating yet, but it involves potential information leakage due to partial results from the hardware divider.
How do I fix CVE-2026-31628?
Fix CVE-2026-31628 by updating your Linux kernel to a version that has the patched changes addressing this vulnerability.
Which versions of the Linux kernel are affected by CVE-2026-31628?
CVE-2026-31628 affects various versions of the Linux kernel, including those from 3.16.58 up to 6.19.
What type of systems are impacted by CVE-2026-31628?
CVE-2026-31628 impacts systems using Zen1 architecture within the Linux kernel that utilize the affected hardware divider.
Is it safe to use an unpatched kernel regarding CVE-2026-31628?
Using an unpatched kernel with CVE-2026-31628 poses a security risk as it may allow attackers to leak sensitive information.