CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's KVM virtualization when running on Hygon Family 18h CPUs, which can lead to unresponsive virtual CPUs due to a failure in handling inter-processor interrupts (IPIs). This can result in significant delays in guest execution and potential system instability. Organizations utilizing Hygon Family 18h processors in their virtualized environments should prioritize applying the necessary mitigations to prevent operational disruptions.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Disable AVIC IPI virtualization on Hygon Family 18h (erratum #1235) Hygon Family 18h CPUs are derived from AMD Family 17h (Zen1) silicon and share the same erratum #1235: hardware may read a stale IsRunning=1 bit during ICR write emulation and silently fail to generate an AVIC_IPI_FAILURE_TARGET_NOT_RUNNING VM-Exit on the sending vCPU. The absence of the VM-Exit causes KVM to miss the required wakeup of blocking target vCPUs, leading to hung vCPUs and unbounded delays in guest execution. Extend the existing AMD Family 17h erratum #1235 workaround to also cover Hygon Family 18h. With IPI virtualization disabled, KVM never sets IsRunning=1 in the Physical ID table, so every non-self IPI generates a VM-Exit and is correctly emulated.
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