CVE-2026-23342: Linux内核cpumap竞态条件漏洞

// Conceptual PoC for CVE-2026-23342 // Triggering the race condition in Linux Kernel BPF cpumap on PREEMPT_RT // Note: Actual reproduction requires a specific kernel config and syzkaller-like setup. #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <pthread.h> // Simulate the operations that lead to the race void* task_a(void* arg) { // Simulates __cpu_map_flush -> bq_flush_to_queue // The critical section where bq->count is reset printf("Task A: Starting flush...\n"); usleep(100); // Simulate delay to force preemption window printf("Task A: Attempting list delete (potential crash)\n"); return NULL; } void* task_b(void* arg) { // Simulates bq_enqueue -> bq_flush_to_queue // Runs concurrently on the same CPU due to PREEMPT_RT printf("Task B: Enqueuing packets...\n"); printf("Task B: Triggering flush and list delete\n"); return NULL; } int main() { pthread_t t1, t2; printf("Starting PoC for CVE-2026-23342 (Race Condition)\n"); pthread_create(&t1, NULL, task_a, NULL); pthread_create(&t2, NULL, task_b, NULL); pthread_join(t1, NULL); pthread_join(t2, NULL); return 0; }