CVE-2026-23347 can: usb: f81604: correctly anchor the urb in the read bulk callback
A missing URB anchor in the Linux kernel CAN driver can lead to memory leaks and potential denial of service when USB devices are disconnected.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-23347?
CVE-2026-23347 is a medium-severity memory corruption vulnerability in Linux kernel, published on 25 Mar 2026. 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: usb: f81604: correctly anchor the urb in the read bulk callback
When submitting an urb, that is using the anchor pattern, it needs to be anchored before submitting it otherwise it could be leaked if usb_kill_anchored_urbs() is called. This logic is correctly done elsewhere in the driver, except in the read bulk callback so do that here also.
Which versions are affected by CVE-2026-23347?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-23347?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-23347 being exploited?
There is no known exploitation of CVE-2026-23347 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-23347, DEBIAN-CVE-2026-23347, GHSA-75xj-x496-vm4v, ROOT-OS-DEBIAN-13-CVE-2026-23347, ROOT-OS-UBUNTU-2204-CVE-2026-23347, ROOT-OS-UBUNTU-2404-CVE-2026-23347 and 1 more.