CVE-2026-43218: Linux内核tw9903驱动内存泄漏漏洞

/* * PoC Concept for CVE-2026-43218 * This snippet demonstrates the logic flaw where allocated memory is not freed on error. */ #include <linux/module.h> #include <media/v4l2-ctrls.h> // Simulating the vulnerable driver logic static int vulnerable_probe_logic(void) { struct v4l2_ctrl_handler *handler; int ret; // Step 1: Initialize control handler (Allocates memory) handler = kzalloc(sizeof(*handler), GFP_KERNEL); if (!handler) return -ENOMEM; v4l2_ctrl_handler_init(handler, 4); // Step 2: Add standard controls (Allocates more memory) v4l2_ctrl_new_std(handler, NULL, V4L2_CID_BRIGHTNESS, 0, 255, 1, 128); // Step 3: Simulate a failure condition (e.g., hardware check fails) if (1) { // Forced failure for demonstration // VULNERABILITY: v4l2_ctrl_handler_free(handler) is missing here. // The function returns error, leaking the memory allocated above. pr_err("Probe failed, leaking memory.\n"); return -ENODEV; } // Normal path v4l2_ctrl_handler_free(handler); return 0; }