CVE-2025-40107 can: hi311x: fix null pointer dereference when resuming from sleep before interface was enabled
A null pointer dereference in the Linux kernel hi311x CAN driver causes a denial of service when resuming from sleep before the interface is enabled.
- 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-2025-40107?
CVE-2025-40107 is a vulnerability in Linux, published on 3 Nov 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: hi311x: fix null pointer dereference when resuming from sleep before interface was enabled
This issue is similar to the vulnerability in the `mcp251x` driver, which was fixed in commit 03c427147b2d ("can: mcp251x: fix resume from sleep before interface was brought up").
In the `hi311x` driver, when the device resumes from sleep, the driver schedules `priv->restart_work`. However, if the network interface was not previously enabled, the `priv->wq` (workqueue) is not allocated and initialized, leading to a null pointer dereference.
To fix this, we move the allocation and initialization of the workqueue from the `hi3110_open` function to the `hi3110_can_probe` function. This ensures that the workqueue is properly initialized before it is used during device resume. And added logic to destroy the workqueue in the error handling paths of `hi3110_can_probe` and in the `hi3110_can_remove` function to prevent resource leaks.
Which versions are affected by CVE-2025-40107?
How do I fix CVE-2025-40107?
Apply the vendor's patch.
Is CVE-2025-40107 being exploited?
There is no known exploitation of CVE-2025-40107 in the wild and no public exploit code.
Sources
Also known as AZL-69586, BELL-CVE-2025-40107, DEBIAN-CVE-2025-40107, GHSA-394x-fq64-jqf6, ROOT-OS-DEBIAN-11-CVE-2025-40107, ROOT-OS-DEBIAN-12-CVE-2025-40107 and 4 more.