CVE-2026-43282 Linux内核RDMA空指针解引用漏洞

/** * PoC Simulation for CVE-2026-43282 * This snippet demonstrates the vulnerable logic in ionic_query_port. * Compile as a kernel module to test (requires specific environment). */ #include <linux/module.h> #include <linux/netdevice.h> // Mocking the vulnerable function structure struct ib_device; struct net_device *ib_device_get_netdev(struct ib_device *device, u8 port) { // Simulate a condition where netdev is not found return NULL; } int vulnerable_ionic_query_port(struct ib_device *ibdev, u8 port) { struct net_device *ndev; ndev = ib_device_get_netdev(ibdev, port); // VULNERABILITY: Missing check for NULL pointer // if (!ndev) // return -ENODEV; // This line will cause a Kernel Oops (NULL pointer dereference) printk(KERN_INFO "Netdev name: %s\n", ndev->name); return 0; } // Fixed version for reference int fixed_ionic_query_port(struct ib_device *ibdev, u8 port) { struct net_device *ndev; ndev = ib_device_get_netdev(ibdev, port); if (!ndev) return -ENODEV; printk(KERN_INFO "Netdev name: %s\n", ndev->name); return 0; }