FKIE_CVE-2025-38535

Vulnerability from fkie_nvd - Published: 2025-08-16 12:15 - Updated: 2026-01-07 18:56
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1bb85b5c2bd43b687c3d54eb6328917f90dd38fcPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5367cdeb75cb6c687ca468450bceb2602ab239d8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cdcb0ffd6448f6be898956913a42bd08e59fb2aePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ceb645ac6ce052609ee5c8f819a80e8881789b04Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cefc1caee9dd06c69e2d807edc5949b329f52b22Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eaa420339658615d26c1cc95cd6cf720b9aebfcaPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ec7f98ff05f0649af0adeb4808c7ba23d6111ef9Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlThird Party Advisory, Mailing List
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlThird Party Advisory, Mailing List
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.16
linux linux_kernel 6.16
linux linux_kernel 6.16
linux linux_kernel 6.16
linux linux_kernel 6.16
linux linux_kernel 6.16
debian debian_linux 11.0
To clipboard 

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  "descriptions": [
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      "lang": "en",
      "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\u0027s 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."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: phy: tegra: xusb: Corregir la desactivaci\u00f3n del regulador desequilibrado en el modo UTMI PHY Al realizar la transici\u00f3n de USB_ROLE_DEVICE a USB_ROLE_NONE, el c\u00f3digo asum\u00eda que el regulador deb\u00eda estar desactivado. Sin embargo, si el regulador est\u00e1 marcado como siempre activo, regulator_is_enabled() sigue devolviendo verdadero, lo que lleva a un intento incorrecto de desactivar un regulador que no est\u00e1 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 l\u00f3gica de control del regulador a la funci\u00f3n tegra186_xusb_padctl_id_override() ya que est\u00e1 directamente relacionada con el estado de anulaci\u00f3n de ID. El regulador ahora solo se desactiva cuando el rol cambia de USB_ROLE_HOST a USB_ROLE_NONE, mediante la comprobaci\u00f3n del registro VBUS_ID. Esto garantiza que las operaciones de activaci\u00f3n/desactivaci\u00f3n del regulador est\u00e9n correctamente equilibradas y solo se produzcan al cambiar al modo host o viceversa."
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  "id": "CVE-2025-38535",
  "lastModified": "2026-01-07T18:56:51.793",
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  "published": "2025-08-16T12:15:29.217",
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