CVE-2026-31732

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

gpio: Fix resource leaks on errors in gpiochip_add_data_with_key()

Since commit aab5c6f20023 ("gpio: set device type for GPIO chips"),

`gdev->dev.release` is unset. As a result, the reference count to

`gdev->dev` isn't dropped on the error handling paths.

Drop the reference on errors.

Also reorder the instructions to make the error handling simpler.

Now gpiochip_add_data_with_key() roughly looks like:

>>> Some memory allocation. Go to ERR ZONE 1 on errors.

>>> device_initialize().

gpiodev_release() takes over the responsibility for freeing the

resources of `gdev->dev`. The subsequent error handling paths

shouldn't go through ERR ZONE 1 again which leads to double free.

>>> Some initialization mainly on `gdev`.

>>> The rest of initialization. Go to ERR ZONE 2 on errors.

>>> Chip registration success and exit.

>>> ERR ZONE 2. gpio_device_put() and exit.

>>> ERR ZONE 1.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References