CVE-2025-38535
Full vulnerability record from the local CVENow database.
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.
Severity
HIGH
CVSS score
7.8
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-08-16 12:15:29.217000
Last modified
2026-11-05 22:17:17.143000
View original CVE JSON
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"published": "2025-08-16T12:15:29.217",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nphy: tegra: xusb: Fix unbalanced regulator disable in UTMI PHY mode\n\nWhen transitioning from USB_ROLE_DEVICE to USB_ROLE_NONE, the code\nassumed that the regulator should be disabled. However, if the regulator\nis marked as always-on, regulator_is_enabled() continues to return true,\nleading to an incorrect attempt to disable a regulator which is not\nenabled.\n\nThis can result in warnings such as:\n\n[ 250.155624] WARNING: CPU: 1 PID: 7326 at drivers/regulator/core.c:3004\n_regulator_disable+0xe4/0x1a0\n[ 250.155652] unbalanced disables for VIN_SYS_5V0\n\nTo fix this, we move the regulator control logic into\ntegra186_xusb_padctl_id_override() function since it's directly related\nto the ID override state. The regulator is now only disabled when the role\ntransitions from USB_ROLE_HOST to USB_ROLE_NONE, by checking the VBUS_ID\nregister. This ensures that regulator enable/disable operations are\nproperly balanced and only occur when actually transitioning to/from host\nmode."
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"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: phy: tegra: xusb: Corregir la desactivación del regulador desequilibrado en el modo UTMI PHY Al realizar la transición de USB_ROLE_DEVICE a USB_ROLE_NONE, el código asumía que el regulador debía estar desactivado. Sin embargo, si el regulador está marcado como siempre activo, regulator_is_enabled() sigue devolviendo verdadero, lo que lleva a un intento incorrecto de desactivar un regulador que no está activado. Esto puede generar advertencias como: [ 250.155624] ADVERTENCIA: CPU: 1 PID: 7326 en drivers/regulator/core.c:3004 _regulator_disable+0xe4/0x1a0 [ 250.155652] desactivaciones desequilibradas para VIN_SYS_5V0 Para solucionar esto, movemos la lógica de control del regulador a la función tegra186_xusb_padctl_id_override() ya que está directamente relacionada con el estado de anulación de ID. El regulador ahora solo se desactiva cuando el rol cambia de USB_ROLE_HOST a USB_ROLE_NONE, mediante la comprobación del registro VBUS_ID. Esto garantiza que las operaciones de activación/desactivación del regulador estén correctamente equilibradas y solo se produzcan al cambiar al modo host o viceversa."
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