Linux Kernel 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.

The affected product is the Linux kernel, specifically the rtl8150 USB Ethernet driver (drivers/net/usb/rtl8150.c). No CPE strings or explicit version ranges were provided in the source data; the eight git.kernel.org stable commit references (e.g. 114e05344763, 1a08a37ac03d, 54f8ef1a970a, 6053e47bbf21, 6394bade9daa, 958baf5eaee3, 9d72df7f5eac, cce3c0e21cdd) indicate the fix was backported across multiple stable branches. Distribution exposure is confirmed for Ubuntu via advisories USN-8126-1 (https://ubuntu.com/security/notices/USN-8126-1) and USN-8125-1 (https://ubuntu.com/security/notices/USN-8125-1).