CVE-2025-38535

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> phy: tegra: xusb: Fix unbalanced regulator disable in UTMI PHY mode<br /> <br /> When transitioning from USB_ROLE_DEVICE to USB_ROLE_NONE, the code<br /> assumed that the regulator should be disabled. However, if the regulator<br /> is marked as always-on, regulator_is_enabled() continues to return true,<br /> leading to an incorrect attempt to disable a regulator which is not<br /> enabled.<br /> <br /> This can result in warnings such as:<br /> <br /> [ 250.155624] WARNING: CPU: 1 PID: 7326 at drivers/regulator/core.c:3004<br /> _regulator_disable+0xe4/0x1a0<br /> [ 250.155652] unbalanced disables for VIN_SYS_5V0<br /> <br /> To fix this, we move the regulator control logic into<br /> tegra186_xusb_padctl_id_override() function since it&amp;#39;s directly related<br /> to the ID override state. The regulator is now only disabled when the role<br /> transitions from USB_ROLE_HOST to USB_ROLE_NONE, by checking the VBUS_ID<br /> register. This ensures that regulator enable/disable operations are<br /> properly balanced and only occur when actually transitioning to/from host<br /> mode.