CVE-2026-31645 Linux内核lan966x驱动页面池泄漏漏洞

/* * Conceptual Proof of Concept for CVE-2026-31645 * This code demonstrates the logic flow that causes the leak. * Actual exploitation requires a system with the specific * Microchip LAN966x hardware and the vulnerable kernel driver. */ #include <linux/module.h> #include <linux/netdevice.h> // Hypothetical structure definitions based on the patch context struct page_pool *pool; void simulate_vulnerable_error_path(void) { // Step 1: Create page pool (Successful) pool = page_pool_create(...); if (!pool) return; // Step 2: Attempt DMA coherent allocation (Simulate Failure) if (fdma_alloc_coherent(...) != 0) { // VULNERABILITY: The code returns here without calling page_pool_destroy(pool). // This results in a memory leak of the page pool. pr_err("DMA allocation failed. Leaking page pool!\n"); return; } // Normal cleanup if successful page_pool_destroy(pool); } // Note: To test this, one would need to load the driver on affected hardware // and induce conditions where fdma_alloc_coherent fails repeatedly.