CVE-2025-68307 can: gs_usb: gs_usb_xmit_callback(): fix handling of failed transmitted URBs
A resource leak in the Linux kernel gs_usb driver causes transmission stoppage, leading to denial of service for CAN bus communications.
- 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-2025-68307?
CVE-2025-68307 is a denial of service vulnerability in Linux, published on 16 Dec 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:
can: gs_usb: gs_usb_xmit_callback(): fix handling of failed transmitted URBs
The driver lacks the cleanup of failed transfers of URBs. This reduces the number of available URBs per error by 1. This leads to reduced performance and ultimately to a complete stop of the transmission.
If the sending of a bulk URB fails do proper cleanup: - increase netdev stats - mark the echo_sbk as free - free the driver's context and do accounting - wake the send queue
Which versions are affected by CVE-2025-68307?
How do I fix CVE-2025-68307?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-68307 being exploited?
There is no known exploitation of CVE-2025-68307 in the wild and no public exploit code.
Sources
Also known as AZL-72619, BELL-CVE-2025-68307, DEBIAN-CVE-2025-68307, GHSA-3c7h-926p-7f94, ROOT-OS-DEBIAN-11-CVE-2025-68307, ROOT-OS-DEBIAN-12-CVE-2025-68307 and 4 more.