CVE-2026-43084 Linux内核nfnetlink释放后重用漏洞

// Conceptual PoC skeleton for triggering race condition in nfnetlink_queue #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <pthread.h> #include <sys/socket.h> #include <linux/netlink.h> // This is a simulation structure to represent the logic // Real exploitation requires interacting with kernel netlink sockets void* trigger_race(void* arg) { // Simulate sending verdicts and modifying queue entries // In a real scenario, this interacts with nfnetlink_queue for(int i = 0; i < 1000; i++) { // Send netlink message to queue // Trigger kfree in one thread // Trigger access in another thread } return NULL; } int main() { pthread_t t1, t2; // Setup netlink socket (omitted for brevity/safety) pthread_create(&t1, NULL, trigger_race, NULL); pthread_create(&t2, NULL, trigger_race, NULL); pthread_join(t1, NULL); pthread_join(t2, NULL); return 0; }