CVE-2025-38535 (GCVE-0-2025-38535)

Vulnerability from cvelistv5 – Published: 2025-08-16 11:12 – Updated: 2026-05-11 21:29
VLAI?
Title
phy: tegra: xusb: Fix unbalanced regulator disable in UTMI PHY mode
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 49d46e3c7e597e8b00c6fc16e6fd7a92044f4371 , < ceb645ac6ce052609ee5c8f819a80e8881789b04 (git)
Affected: 49d46e3c7e597e8b00c6fc16e6fd7a92044f4371 , < cdcb0ffd6448f6be898956913a42bd08e59fb2ae (git)
Affected: 49d46e3c7e597e8b00c6fc16e6fd7a92044f4371 , < 1bb85b5c2bd43b687c3d54eb6328917f90dd38fc (git)
Affected: 49d46e3c7e597e8b00c6fc16e6fd7a92044f4371 , < 5367cdeb75cb6c687ca468450bceb2602ab239d8 (git)
Affected: 49d46e3c7e597e8b00c6fc16e6fd7a92044f4371 , < ec7f98ff05f0649af0adeb4808c7ba23d6111ef9 (git)
Affected: 49d46e3c7e597e8b00c6fc16e6fd7a92044f4371 , < eaa420339658615d26c1cc95cd6cf720b9aebfca (git)
Affected: 49d46e3c7e597e8b00c6fc16e6fd7a92044f4371 , < cefc1caee9dd06c69e2d807edc5949b329f52b22 (git)
Create a notification for this product.
Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.147 , ≤ 6.1.* (semver)
Unaffected: 6.6.100 , ≤ 6.6.* (semver)
Unaffected: 6.12.40 , ≤ 6.12.* (semver)
Unaffected: 6.15.8 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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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\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."
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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. 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}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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