CVE-2026-43180

Summary

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/443a830b1dc4f85c7560da59d4494b629feee215
• https://git.kernel.org/stable/c/586318c2730433184c6f1d21183e346ddf25e81d
• https://git.kernel.org/stable/c/a2cd4b4db315a845a5603d08c9d03b11ddfc799d
• https://git.kernel.org/stable/c/ef9b10a020503888eb6c8ed85a3d901a624ede4c
• https://git.kernel.org/stable/c/9c79b839a63980c7da7ec5db895198045e154112
• https://git.kernel.org/stable/c/fc393af769af845d9985e2845e49553d8f015a64
• https://git.kernel.org/stable/c/8367c0e90126426e60581e4c07e1ec4411a0f843
• https://git.kernel.org/stable/c/64868f5ecadeb359a49bc4485bfa7c497047f13a

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