CVE-2025-40140 net: usb: Remove disruptive netif_wake_queue in rtl8150_set_multicast
A race condition in the rtl8150 USB network driver allows double URB submission, potentially causing a kernel warning and denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-40140?
CVE-2025-40140 is a high-severity vulnerability in Linux, published on 12 Nov 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2025-40140?
How do I fix CVE-2025-40140?
Apply the vendor's patch.
Is CVE-2025-40140 being exploited?
There is no known exploitation of CVE-2025-40140 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2025-40140, DEBIAN-CVE-2025-40140, GHSA-9f54-r6pv-hv3h, ROOT-OS-DEBIAN-11-CVE-2025-40140, ROOT-OS-DEBIAN-13-CVE-2025-40140, ROOT-OS-UBUNTU-2404-CVE-2025-40140 and 1 more.