CVE-2026-43130: Linux内核IOMMU组件拒绝服务漏洞

#!/bin/bash # Conceptual PoC for CVE-2026-43130 # This script demonstrates the trigger condition for the DoS. # Prerequisites: A system with a vulnerable Linux kernel and a PCIe device susceptible to link-down. # Step 1: Set up a VM with direct device assignment (PCI passthrough) # (Implementation depends on Hypervisor, e.g., QEMU/KVM) echo "Starting VM with PCIe passthrough..." # virsh start vulnerable_vm # Step 2: Simulate or wait for a PCIe link fault # This might involve physically unplugging the device or triggering a firmware error. echo "Triggering PCIe link fault..." # Step 3: Execute the cleanup operation which triggers the invalidation path # The 'virsh destroy' command calls the release function leading to the crash. echo "Destroying VM to trigger resource release..." # virsh destroy vulnerable_vm # Result: The system attempts to flush IOTLB on the disconnected device. # Instead of skipping, it hangs, causing a hard lockup (kernel panic/hang).