CVE-2026-23080 can: mcba_usb: mcba_usb_read_bulk_callback(): fix URB memory leak
A memory leak in the Linux kernel's mcba_usb CAN driver allows attackers to cause a denial of service by exhausting system memory.
- 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-2026-23080?
CVE-2026-23080 is a medium-severity memory corruption 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: mcba_usb: mcba_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 mcba_usb_probe() -> mcba_usb_start(), the URBs for USB-in transfers are allocated, added to the priv->rx_submitted anchor and submitted. In the complete callback mcba_usb_read_bulk_callback(), the URBs are processed and resubmitted. In mcba_usb_close() -> mcba_urb_unlink() the URBs are freed by calling usb_kill_anchored_urbs(&priv->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 mcba_usb_read_bulk_callback()to the priv->rx_submitted anchor.
Weakness: CWE-401
Which versions are affected by CVE-2026-23080?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-23080?
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-2026-23080 being exploited?
There is no known exploitation of CVE-2026-23080 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-77205, BELL-CVE-2026-23080, DEBIAN-CVE-2026-23080, GHSA-cc38-6q22-j4rm, ROOT-OS-DEBIAN-11-CVE-2026-23080, ROOT-OS-DEBIAN-12-CVE-2026-23080 and 4 more.