KVM Vulnerability in AmpereOne Affecting Linux Kernel

CVE-2026-80699

What is CVE-2026-80699?

A vulnerability in the Linux Kernel affects the KVM related to the handling of IRQ deactivation in a nested state on AmpereOne processors. In this context, if a physical interrupt is deactivated through specific control registers when it is not active, it may lead to a loss of the interrupt pending state, preventing future interrupts from being delivered. This bug stems from the improper handling of the IRQ deactivation process, which could result in unintended behavior and system instability.

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