CVE-2026-23281 Linux内核libertas驱动UAF漏洞

/* * Conceptual PoC for CVE-2026-23281 * This demonstrates the race condition logic. * It is not a full exploit but illustrates the vulnerability. */ #include <linux/module.h> #include <linux/timer.h> struct mock_device { struct timer_list cleanup_timer; int data; }; // Simulate the timer callback accessing device data void device_timer_callback(struct timer_list *t) { struct mock_device *dev = from_timer(dev, t, cleanup_timer); // Vulnerability point: Accessing dev after potential free printk(KERN_INFO "Accessing device data: %d\n", dev->data); } // Simulate the vulnerable cleanup function void vulnerable_cleanup(struct mock_device *dev) { // VULNERABILITY: Using timer_delete (non-sync) // If the callback is running here, it continues. timer_delete(&dev->cleanup_timer); // Free the structure immediately // If callback is still running, it will use freed memory (UAF) kfree(dev); printk(KERN_INFO "Device freed (Race condition possible)\n"); } // Correct fix: Use timer_delete_sync void fixed_cleanup(struct mock_device *dev) { // FIX: Wait for callback to finish timer_delete_sync(&dev->cleanup_timer); kfree(dev); }