CVE-2026-23037 can: etas_es58x: allow partial RX URB allocation to succeed
A memory leak in the Linux kernel CAN driver allows attackers to cause denial of service by triggering partial URB allocation failures.
- 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-2026-23037?
CVE-2026-23037 is a memory corruption vulnerability in Linux, published on 31 Jan 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: etas_es58x: allow partial RX URB allocation to succeed
When es58x_alloc_rx_urbs() fails to allocate the requested number of URBs but succeeds in allocating some, it returns an error code. This causes es58x_open() to return early, skipping the cleanup label 'free_urbs', which leads to the anchored URBs being leaked.
As pointed out by maintainer Vincent Mailhol, the driver is designed to handle partial URB allocation gracefully. Therefore, partial allocation should not be treated as a fatal error.
Modify es58x_alloc_rx_urbs() to return 0 if at least one URB has been allocated, restoring the intended behavior and preventing the leak in es58x_open().
Which versions are affected by CVE-2026-23037?
How do I fix CVE-2026-23037?
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-2026-23037 being exploited?
There is no known exploitation of CVE-2026-23037 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-23037, DEBIAN-CVE-2026-23037, GHSA-35c8-wvgc-32mg, ROOT-OS-DEBIAN-12-CVE-2026-23037, ROOT-OS-DEBIAN-13-CVE-2026-23037, ROOT-OS-UBUNTU-2204-CVE-2026-23037 and 2 more.