KVM: arm64: vgic: Take a refcount on IRQs referenced by last_lr_irq

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In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: vgic: Take a refcount on IRQs referenced by last_lr_irq Referencing the last interrupt inserted in an LR is rather fragile, as this interrupt can vanish if a concurrently unmapped LPI. Solve this by bumping up the refcount on the interrupt when populating last_lr_irq, and drop it at vgic_prune_ap_list() time, when LPIs are being reclaimed.

Source published

18 Oct 2026 15:46:44 UTC

Source modified

19 Oct 2026 09:24:23 UTC

Observed here

23 Oct 2026 15:48:27 UTC

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