CVE-2025-40140

In the Linux kernel, the following vulnerability has been resolved:

net: usb: Remove disruptive netif_wake_queue in rtl8150_set_multicast

syzbot reported WARNING in rtl8150_start_xmit/usb_submit_urb.

This is the sequence of events that leads to the warning:

rtl8150_start_xmit() {

netif_stop_queue();

usb_submit_urb(dev->tx_urb);

}

rtl8150_set_multicast() {

netif_stop_queue();

netif_wake_queue(); <-- wakes up TX queue before URB is done

}

rtl8150_start_xmit() {

netif_stop_queue();

usb_submit_urb(dev->tx_urb); <-- double submission

}

rtl8150_set_multicast being the ndo_set_rx_mode callback should not be

calling netif_stop_queue and notif_start_queue as these handle

TX queue synchronization.

The net core function dev_set_rx_mode handles the synchronization

for rtl8150_set_multicast making it safe to remove these locks.