CVE-2026-43225 Linux内核内存泄漏漏洞

/* * PoC Concept for CVE-2026-43225 * Demonstrates the logic flaw in rtl8723bs driver leading to memory leak. * This code simulates the vulnerable path where 'buf' is not freed on error. */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/slab.h> // Simulated function representing the vulnerable driver logic int vulnerable_logic(void) { // Allocate buffer, simulating kmalloc in driver void *buf = kmalloc(1024, GFP_KERNEL); if (!buf) return -ENOMEM; // Simulate cfg80211_inform_bss_frame returning NULL (failure) // Real trigger involves specific wireless frame conditions void *inform_result = NULL; if (!inform_result) { // VULNERABILITY: 'buf' is leaked here as function returns early // In the real driver: return -EINVAL; printk(KERN_ALERT "Memory leaked: buf not freed before return!\n"); return -EINVAL; } // Correct path (not taken in PoC) kfree(buf); return 0; } // To reproduce: Load this module and call vulnerable_logic repeatedly // to observe increase in kernel memory usage (kmemleak can be used).