CVE-2025-68781

Technical Description

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

usb: phy: fsl-usb: Fix use-after-free in delayed work during device removal

The delayed work item otg_event is initialized in fsl_otg_conf() and

scheduled under two conditions:

1. When a host controller binds to the OTG controller.

2. When the USB ID pin state changes (cable insertion/removal).

A race condition occurs when the device is removed via fsl_otg_remove():

the fsl_otg instance may be freed while the delayed work is still pending

or executing. This leads to use-after-free when the work function

fsl_otg_event() accesses the already freed memory.

The problematic scenario:

(detach thread) | (delayed work)

fsl_otg_remove() |

kfree(fsl_otg_dev) //FREE| fsl_otg_event()

| og = container_of(...) //USE

| og-> //USE

Fix this by calling disable_delayed_work_sync() in fsl_otg_remove()

before deallocating the fsl_otg structure. This ensu

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