CVE-2026-43180

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

net: usb: kaweth: remove TX queue manipulation in kaweth_set_rx_mode

kaweth_set_rx_mode(), the ndo_set_rx_mode callback, calls

netif_stop_queue() and netif_wake_queue(). These are TX queue flow

control functions unrelated to RX multicast configuration.

The premature netif_wake_queue() can re-enable TX while tx_urb is still

in-flight, leading to a double usb_submit_urb() on the same URB:

kaweth_start_xmit() {

netif_stop_queue();

usb_submit_urb(kaweth->tx_urb);

}

kaweth_set_rx_mode() {

netif_stop_queue();

netif_wake_queue(); // wakes TX queue before URB is done

}

kaweth_start_xmit() {

netif_stop_queue();

usb_submit_urb(kaweth->tx_urb); // URB submitted while active

}

This triggers the WARN in usb_submit_urb():

"URB submitted while active"

This is a similar class of bug fixed in rtl8150 by

- commit 958baf5eaee3 ("net: usb: Remove disruptive netif_wake_queue in rtl8150_set_multicast").

Also kaweth_set_rx_mode() is already functionally broken, the

real set_rx_mode action is performed by kaweth_async_set_rx_mode(),

which in turn is not a no-op only at ndo_open() time.