CVE-2026-23347 Linux内核F81604驱动资源泄露漏洞

/* * PoC Concept: Logic flaw in f81604 read bulk callback * This snippet illustrates the missing anchor before submit. */ // Vulnerable Logic Flow (Conceptual) void f81604_read_bulk_callback(struct urb *urb) { // ... processing ... // Resubmit URB // BUG: URB is submitted BEFORE being anchored int ret = usb_submit_urb(urb, GFP_ATOMIC); // If usb_kill_anchored_urbs is called here, 'urb' is leaked // because it is not yet anchored to the list. usb_anchor_urb(urb, &priv->anchor); // Too late or missing in original code // ... } // Correct Logic (Fix) void f81604_read_bulk_callback_fixed(struct urb *urb) { // ... processing ... // Anchor the URB BEFORE submitting usb_anchor_urb(urb, &priv->anchor); int ret = usb_submit_urb(urb, GFP_ATOMIC); if (ret) { usb_unanchor_urb(urb); // Handle error properly } }