CVE-2026-23444 Linux内核mac80211内存释放漏洞

/* * Conceptual Proof of Concept for CVE-2026-23444 * This snippet demonstrates the logic flow that triggers the vulnerability. * It requires a system with a vulnerable wireless driver (e.g., ath9k, mt76). */ #include <linux/module.h> #include <net/mac80211.h> // Simulated trigger function to illustrate the TX_DROP path void simulate_tx_failure(struct ieee80211_hw *hw, struct sk_buff *skb) { struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); // The vulnerability occurs when ieee80211_tx_prepare_skb() fails // specifically at the first error path (TX_DROP) without freeing the skb. // In the vulnerable code: // if (ieee80211_tx_prepare(...)) // return TX_DROP; // skb is NOT freed here (Bug) // The caller (e.g., ath9k) would then attempt to free the skb: // if (ret != TX_SUCCESS) // kfree_skb(skb); // Double free if fixed in function, leak if not. printk(KERN_INFO "Attempting to trigger CVE-2026-23444 TX_DROP path\n"); // Actual exploitation requires specific hardware interaction to force // the TX_DROP state within the mac80211 subsystem. } int init_module(void) { printk(KERN_INFO "CVE-2026-23444 PoC module loaded\n"); return 0; } void cleanup_module(void) { printk(KERN_INFO "CVE-2026-23444 PoC module unloaded\n"); } MODULE_LICENSE("GPL");