CVE-2026-43264 Linux内核fbdev引用计数泄露漏洞

/* * PoC Concept for CVE-2026-43264 * This module demonstrates the logic to trigger the refcount leak. * Requires a system with the vulnerable kernel and appropriate hardware/DTB. */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/of.h> static int __init poc_init(void) { struct device_node *np; printk(KERN_INFO "CVE-2026-43264 PoC: Initializing...\n"); // In a real scenario, we would trigger the fbdev driver initialization // with a malformed device tree that forces the error path. // e.g., calling of_get_display_timings with a node that has // partial display-timing data causing a jump to 'entryfail'. // Since the function is static/internal, we rely on hardware trigger. // This logs the intent to monitor kmemleak. printk(KERN_INFO "Check dmesg for 'unreferenced object' warnings if kmemleak is enabled.\n"); return 0; } static void __exit poc_exit(void) { printk(KERN_INFO "CVE-2026-43264 PoC: Exiting...\n"); } module_init(poc_init); module_exit(poc_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("PoC for CVE-2026-43264 Refcount Leak");