CVE-2023-53596

Technical Description

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

drivers: base: Free devm resources when unregistering a device

In the current code, devres_release_all() only gets called if the device

has a bus and has been probed.

This leads to issues when using bus-less or driver-less devices where

the device might never get freed if a managed resource holds a reference

to the device. This is happening in the DRM framework for example.

We should thus call devres_release_all() in the device_del() function to

make sure that the device-managed actions are properly executed when the

device is unregistered, even if it has neither a bus nor a driver.

This is effectively the same change than commit 2f8d16a996da ("devres:

release resources on device_del()") that got reverted by commit

a525a3ddeaca ("driver core: free devres in device_release") over

memory leaks concerns.

This patch effectively combines the two commits mentioned above to

release the resources both on device_del() and

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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.

Affected Products

References