CVE-2026-31720 Linux内核USB栈溢出漏洞

/* * Conceptual PoC for CVE-2026-31720 * This snippet demonstrates the vulnerable logic in f_audio_complete(). */ #include <stdio.h> #include <string.h> #include <stdint.h> // Simulated vulnerable function void vulnerable_f_audio_complete(size_t req_length, void *req_buf) { u32 data = 0; printf("[+] Calling memcpy with length: %zu\n", req_length); // VULNERABILITY: req_length is controlled by attacker and can be > 4 memcpy(&data, req_buf, req_length); printf("[+] Copy completed.\n"); } int main() { // Malicious buffer larger than 4 bytes char malicious_payload[100]; memset(malicious_payload, 0x41, sizeof(malicious_payload)); printf("[*] Triggering CVE-2026-31720 Stack Overflow...\n"); // Simulate sending a USB request with req->length = 100 vulnerable_f_audio_complete(100, malicious_payload); return 0; }