CVE-2025-38136

/// Technical description

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

usb: renesas_usbhs: Reorder clock handling and power management in probe

Reorder the initialization sequence in `usbhs_probe()` to enable runtime

PM before accessing registers, preventing potential crashes due to

uninitialized clocks.

Currently, in the probe path, registers are accessed before enabling the

clocks, leading to a synchronous external abort on the RZ/V2H SoC.

The problematic call flow is as follows:

usbhs_probe()

usbhs_sys_clock_ctrl()

usbhs_bset()

usbhs_write()

iowrite16() <-- Register access before enabling clocks

Since `iowrite16()` is performed without ensuring the required clocks are

enabled, this can lead to access errors. To fix this, enable PM runtime

early in the probe function and ensure clocks are acquired before register

access, preventing crashes like the following on RZ/V2H:

[13.272640] Internal error: synchronous external abo

/// 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