CVE-2026-23294 Linux内核竞态条件漏洞

/* * Conceptual PoC for CVE-2026-23294 Race Condition * This demonstrates the logic flow causing the race. */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/bpf.h> // Simulated structure based on vulnerability description struct xdp_dev_bulk_queue { void *q[16]; int count; }; static int __init poc_init(void) { // In a real exploit, this would involve triggering XDP redirects // on a PREEMPT_RT kernel to force preemption between: // Task A: cnt = bq->count; // Preemption happens here // Task B: bq_xmit_all(bq); // Frees frames // Task A: ndo_xdp_xmit(bq->q[]); // Use-after-free printk(KERN_INFO "CVE-2026-23294: Triggering race condition logic...\n"); // Logic simulation: // 1. Load BPF program with devmap redirect. // 2. Send packets to trigger redirect. // 3. Exploit CFS scheduler latency on RT kernel. return 0; } static void __exit poc_exit(void) { printk(KERN_INFO "CVE-2026-23294: Module unloaded.\n"); } module_init(poc_init); module_exit(poc_exit); MODULE_LICENSE("GPL");