Linux内核IOAM6越界访问漏洞 (CVE-2026-43083)

/* * PoC Concept for CVE-2026-43083 * This script attempts to trigger the OOB access by sending packets * with IOAM6 trace type bit6 set, targeting an interface setup * where RX queues > TX queues. */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/netdevice.h> #include <linux/skbuff.h> #include <net/sock.h> // Conceptual kernel module structure to trigger the condition // Actual exploitation requires specific network topology configuration void trigger_vuln(struct sk_buff *skb) { // Manipulate skb to simulate the condition: // 1. Ensure IOAM6 trace data is present with bit6 set // 2. Ensure is_input path is taken // 3. Set skb->queue_mapping to a high value (>= dev->num_tx_queues) // If the device has fewer TX queues than the RX queue index mapped here, // the kernel will panic or crash in __ioam6_fill_trace_data. printk(KERN_INFO "Attempting to trigger CVE-2026-43083\n"); } // Note: Full PoC would require crafting specific IOAM6 packets via raw sockets // and configuring the network interfaces with asymmetric queue counts.