CVE-2026-31779 Linux内核iwlwifi越界读取漏洞

/* * Conceptual PoC for CVE-2026-31779 * This snippet demonstrates the vulnerable logic in the kernel driver. */ #include <linux/kernel.h> #include <linux/module.h> // Vulnerable structure representation struct iwl_mvm_nd_match_info_notif { __le16 length; u8 matches[]; // Dynamic array }; void vulnerable_iwl_mvm_nd_match_info_handler(struct iwl_mvm_nd_match_info_notif *notif) { // Simulated buffer to copy into u8 results_matches[32]; // Vulnerability: No check if notif->length is valid before memcpy // If notif->length is larger than the actual packet size, this crashes. // If notif is crafted to be small but length says big, OOB read occurs. memcpy(results_matches, notif->matches, notif->length); } /* * Exploitation requires sending a malformed 802.11 frame to the target device * where the length field in the notification header exceeds the actual payload size. */