CVE-2026-43034: Linux内核bnxt_en驱动程序越界访问漏洞

/* * PoC Concept for CVE-2026-43034 * This is a conceptual demonstration. Triggering this requires specific hardware * (Broadcom NetXtreme-C/E) and interaction with the bnxt_en driver. * The vulnerability is triggered during the backing store query capabilities phase. */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/netdevice.h> // Conceptual trigger function void trigger_vulnerability(struct net_device *dev) { // In a real scenario, this would involve sending specific HWRM commands // or causing the driver to re-initialize/query backing store types // where the firmware response (resp->type) does not match the expected loop index. printk(KERN_INFO "Attempting to trigger bnxt_en backing store query logic...\n"); // The actual trigger happens inside bnxt_hwrm_func_backing_store_qcaps_v2 // when processing the response from firmware. // If an attacker can influence the firmware response or force a specific state, // they might cause ctxm->type to be used as an invalid array index. } int init_module(void) { printk(KERN_INFO "CVE-2026-43034 PoC Loaded\n"); return 0; } void cleanup_module(void) { printk(KERN_INFO "CVE-2026-43034 PoC Unloaded\n"); } MODULE_LICENSE("GPL");