SCSI Vulnerability in Hyper-V: Scheduling while Atomic Issue

CVE-2026-43475

What is CVE-2026-43475?

A vulnerability in the SCSI subsystem of the Linux kernel has been identified, which could lead to a scheduling issue when the PREEMPT_RT option is enabled on Virtual Machines running on Hyper-V. This flaw could result in system lock-ups and errors, particularly evident when stress-testing the system using tools like stress-ng. The issue originates from improper handling of scheduling states in the storvsc device driver, resulting in a 'scheduling while atomic' bug. The recent updates provide a fix that enhances stability and performance for environments utilizing Hyper-V.

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