CVE-2026-43211: Linux内核PCI锁错误处理漏洞

/* * PoC Concept for CVE-2026-43211 * This is a kernel module concept to trigger the pci_slot_trylock path. * Compile with: make -C /lib/modules/$(uname -r)/build M=$(pwd) modules */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/pci.h> static int __init poc_init(void) { struct pci_dev *dev = NULL; // Iterate through PCI devices to find one with a subordinate bus // to potentially trigger the specific code path in pci_slot_trylock. // Note: Triggering the exact race condition or failure path // requires specific hardware state or contention on the bus lock. // This snippet demonstrates the context where the vulnerability exists. printk(KERN_INFO "CVE-2026-43211 PoC: Attempting to trigger pci_slot_trylock logic\n"); // Hypothetical trigger logic: // In a real scenario, one would need to call pci_slot_trylock on a device // where dev->subordinate exists and pci_bus_trylock fails. return 0; } static void __exit poc_exit(void) { printk(KERN_INFO "CVE-2026-43211 PoC: Unloading module\n"); } module_init(poc_init); module_exit(poc_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("PoC for CVE-2026-43211");