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

{
  "id": "7039e573fc14468df155998222caec543c24b2453ccd7d0941331705277635fe",
  "url": "https://osv.dev/vulnerability/CVE-2025-38535",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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.",
    "evidence": "osv:CVE-2025-38535",
    "products": [
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    "severity": "unknown",
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      "aliases": [
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      "modified": "2026-10-28T02:30:26.113831478Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1bb85b5c2bd43b687c3d54eb6328917f90dd38fc",
        "https://git.kernel.org/stable/c/5367cdeb75cb6c687ca468450bceb2602ab239d8",
        "https://git.kernel.org/stable/c/cdcb0ffd6448f6be898956913a42bd08e59fb2ae",
        "https://git.kernel.org/stable/c/ceb645ac6ce052609ee5c8f819a80e8881789b04",
        "https://git.kernel.org/stable/c/cefc1caee9dd06c69e2d807edc5949b329f52b22",
        "https://git.kernel.org/stable/c/eaa420339658615d26c1cc95cd6cf720b9aebfca",
        "https://git.kernel.org/stable/c/ec7f98ff05f0649af0adeb4808c7ba23d6111ef9",
        "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html",
        "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38535.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-38535",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
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    "security_relevant": true,
    "severity_evidence": null
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  "source_id": "core-osv",
  "document_id": 492749,
  "published_at": "2025-08-16T11:12:27.873+00:00"
}