CVE-2026-23061 can: kvaser_usb: kvaser_usb_read_bulk_callback(): fix URB memory leak
A memory leak in the Kvaser USB CAN driver allows attackers to exhaust kernel memory, potentially causing a denial of service.
- 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-2026-23061?
CVE-2026-23061 is a medium-severity denial of service vulnerability in Linux kernel, published on 4 Feb 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: kvaser_usb: kvaser_usb_read_bulk_callback(): fix URB memory leak
Fix similar memory leak as in commit 7352e1d5932a ("can: gs_usb: gs_usb_receive_bulk_callback(): fix URB memory leak").
In kvaser_usb_set_{,data_}bittiming() -> kvaser_usb_setup_rx_urbs(), the URBs for USB-in transfers are allocated, added to the dev->rx_submitted anchor and submitted. In the complete callback kvaser_usb_read_bulk_callback(), the URBs are processed and resubmitted. In kvaser_usb_remove_interfaces() the URBs are freed by calling usb_kill_anchored_urbs(&dev->rx_submitted).
However, this does not take into account that the USB framework unanchors the URB before the complete function is called. This means that once an in-URB has been completed, it is no longer anchored and is ultimately not released in usb_kill_anchored_urbs().
Fix the memory leak by anchoring the URB in the kvaser_usb_read_bulk_callback() to the dev->rx_submitted anchor.
Weakness: CWE-401
Which versions are affected by CVE-2026-23061?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-23061?
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-2026-23061 being exploited?
There is no known exploitation of CVE-2026-23061 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-77124, BELL-CVE-2026-23061, DEBIAN-CVE-2026-23061, GHSA-84c2-7hw8-q83c, ROOT-OS-DEBIAN-11-CVE-2026-23061, ROOT-OS-DEBIAN-12-CVE-2026-23061 and 4 more.