CVE-2025-38535 Information

Aug 17, 2025 cve

Description

In the Linux kernel the following vulnerability has been resolved:

phy: tegra: xusb: Fix unbalanced regulator disable in UTMI PHY mode

When transitioning from USB_ROLE_DEVICE to USB_ROLE_NONE the code assumed that the regulator should be disabled. However if the regulator is marked as always-on regulator_is_enabled() continues to return true leading to an incorrect attempt to disable a regulator which is not enabled.

This can result in warnings such as:

[ 250.155624] WARNING: CPU: 1 PID: 7326 at drivers/regulator/core.c:3004 _regulator_disable+0xe4/0x1a0 [ 250.155652] unbalanced disables for VIN_SYS_5V0

To fix this we move the regulator control logic into tegra186_xusb_padctl_id_override() function since it’s directly related to the ID override state. The regulator is now only disabled when the role transitions from USB_ROLE_HOST to USB_ROLE_NONE by checking the VBUS_ID register. This ensures that regulator enable/disable operations are properly balanced and only occur when actually transitioning to/from host mode.

Reference

https://git.kernel.org/stable/c/1bb85b5c2bd43b687c3d54eb6328917f90dd38fc https://git.kernel.org/stable/c/5367cdeb75cb6c687ca468450bceb2602ab239d8 https://git.kernel.org/stable/c/cefc1caee9dd06c69e2d807edc5949b329f52b22 https://git.kernel.org/stable/c/eaa420339658615d26c1cc95cd6cf720b9aebfca https://git.kernel.org/stable/c/ec7f98ff05f0649af0adeb4808c7ba23d6111ef9

CNNVD-202508-1954 (Published: 2025-08-16)

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