{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38535",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-38535"
  ],
  "published": "2025-08-16T11:14:15Z",
  "summary": "phy: tegra: xusb: Fix unbalanced regulator disable in UTMI PHY mode",
  "details": "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.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.147",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38535"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ceb645ac6ce052609ee5c8f819a80e8881789b04"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cdcb0ffd6448f6be898956913a42bd08e59fb2ae"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1bb85b5c2bd43b687c3d54eb6328917f90dd38fc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5367cdeb75cb6c687ca468450bceb2602ab239d8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ec7f98ff05f0649af0adeb4808c7ba23d6111ef9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/eaa420339658615d26c1cc95cd6cf720b9aebfca"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cefc1caee9dd06c69e2d807edc5949b329f52b22"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}