CVE-2024-35879

Technical Description

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

of: dynamic: Synchronize of_changeset_destroy() with the devlink removals

In the following sequence:

1) of_platform_depopulate()

2) of_overlay_remove()

During the step 1, devices are destroyed and devlinks are removed.

During the step 2, OF nodes are destroyed but

__of_changeset_entry_destroy() can raise warnings related to missing

of_node_put():

ERROR: memory leak, expected refcount 1 instead of 2 ...

Indeed, during the devlink removals performed at step 1, the removal

itself releasing the device (and the attached of_node) is done by a job

queued in a workqueue and so, it is done asynchronously with respect to

function calls.

When the warning is present, of_node_put() will be called but wrongly

too late from the workqueue job.

In order to be sure that any ongoing devlink removals are done before

the of_node destruction, synchronize the of_changeset_destroy() with the

devlink removals.

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