DMA-based attacks are blocked by the IOMMU, which is present in all modern machines (and has been for a few years). Linux has preferential enablement of DMA suc

DMA-based attacks are blocked by the IOMMU, which is present in all modern machines (and has been for a few years). Linux has preferential enablement of DMA such that the IOMMU is initialised first, so even plugging in a device in early boot will not be able to exploit DMA.