CVE-2026-63940

Updated on 19 Jul 2026

Severity

9.3 Critical severity

Details

CVSS score
9.3

Overview

About vulnerability

In the Linux kernel, the following vulnerability has been resolved:

KVM: SEV: Ignore Port I/O requests of length ‘0’

Explicitly ignore Port I/O requests of length ‘0’ (or count ‘0’), so that setting up the software scratch area (and other code) doesn’t have to worry about underflowing the length, and to allow for WARNing on trying to configure the scratch area with len==0.

Details

KernelCare state

Live-patch status from KernelCare for each operating system.

Operating system Status Covered kernels
Debian 13 Planned