CVE-2026-43371 Linux内核macb驱动拒绝服务漏洞

/* * Conceptual PoC for CVE-2026-43371 * Simulates the logic error where tx_head and tx_tail are reset * without shuffling the ring, leading to a stuck queue. */ #include <stdio.h> #define TX_RING_SIZE 16 struct macb_queue { int tx_head; int tx_tail; int tx_buffer[TX_RING_SIZE]; // Simulating buffer descriptors }; void simulate_vulnerability(struct macb_queue *queue) { // Simulate state before suspend: head=10, tail=5 queue->tx_head = 10; queue->tx_tail = 5; printf("Before suspend: tx_head=%d, tx_tail=%d\n", queue->tx_head, queue->tx_tail); // System suspends... (Hardware resets pointer to base) // Resume: Vulnerable driver logic simply resets head/tail to 0 // without moving the pending packets to the front of the ring. queue->tx_head = 0; queue->tx_tail = 0; printf("After vulnerable resume: tx_head=%d, tx_tail=%d\n", queue->tx_head, queue->tx_tail); // The driver thinks the queue is empty (head == tail), // but the hardware might be stuck waiting for the descriptor at index 5. printf("Result: Driver assumes queue is empty, transmission stuck.\n"); } int main() { struct macb_queue q; simulate_vulnerability(&q); return 0; }