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init_module(2) with a really minimal module, orkexec_load(2) your own kernel, or, if enabled in the kernel,mknod'ing /dev/mem and writing to it, or by opening/sys/bus/pci/devices/…/resource{N}of a DMA-capable device (NIC!) and making it do DMA operations on kernel memoryman kernel_lockdown), whose goal is to stop root from arbitrarily tampering with the kernel (when under UEFI secure boot). That'll stop root from loading arbitrary modules, unless they have access to an enrolled private key to sign them. And the DMA attacks will be stopped by the IOMMU on anything halfway modern (and properly configured).