CVE-2024-35879: of: dynamic: Synchronize of_changeset_destroy() with the devlink removals

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-19 · updated 2026-08-04
Weakness: CWE-401

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.

Affected products

Debian Linux: 10.0
Linux kernel: from 5.10.42 before 5.10.215; from 5.12.9 before 5.13; from 5.13.1 before 5.15.154; from 5.16 before 6.1.85; from 6.2 before 6.6.26; from 6.7 before 6.8.5 — fixed in 5.10.215, 5.13, 5.15.154, 6.1.85, 6.6.26, 6.8.5

How to fix

Upgrade to a fixed version: Linux kernel 5.10.215, 5.13, 5.15.154, 6.1.85. Check the vendor advisory for mitigations.

References

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