CVE-2025-39861

Full vulnerability record from the local CVENow database.
Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: vhci: Prevent use-after-free by removing debugfs files early Move the creation of debugfs files into a dedicated function, and ensure they are explicitly removed during vhci_release(), before associated data structures are freed. Previously, debugfs files such as "force_suspend", "force_wakeup", and others were created under hdev->debugfs but not removed in vhci_release(). Since vhci_release() frees the backing vhci_data structure, any access to these files after release would result in use-after-free errors. Although hdev->debugfs is later freed in hci_release_dev(), user can access files after vhci_data is freed but before hdev->debugfs is released.
Severity
HIGH
CVSS score
7.8 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-09-19 16:15:45.100000
Last modified
2026-10-19 21:10:00.160000
View original CVE JSON
{
  "id": "CVE-2025-39861",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-09-19T16:15:45.100",
  "lastModified": "2026-10-19T21:10:00.160",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: vhci: Prevent use-after-free by removing debugfs files early\n\nMove the creation of debugfs files into a dedicated function, and ensure\nthey are explicitly removed during vhci_release(), before associated\ndata structures are freed.\n\nPreviously, debugfs files such as \"force_suspend\", \"force_wakeup\", and\nothers were created under hdev->debugfs but not removed in\nvhci_release(). Since vhci_release() frees the backing vhci_data\nstructure, any access to these files after release would result in\nuse-after-free errors.\n\nAlthough hdev->debugfs is later freed in hci_release_dev(), user can\naccess files after vhci_data is freed but before hdev->debugfs is\nreleased."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nBluetooth: vhci: Prevenir uso después de liberación al eliminar los archivos debugfs tempranamente\n\nMover la creación de archivos debugfs a una función dedicada, y asegurar que sean eliminados explícitamente durante vhci_release(), antes de que se liberen las estructuras de datos asociadas.\n\nAnteriormente, los archivos debugfs como 'force_suspend', 'force_wakeup' y otros se creaban bajo hdev->debugfs pero no se eliminaban en vhci_release(). Dado que vhci_release() libera la estructura de datos subyacente vhci_data, cualquier acceso a estos archivos después de la liberación resultaría en errores de uso después de liberación.\n\nAunque hdev->debugfs se libera posteriormente en hci_release_dev(), el usuario puede acceder a los archivos después de que vhci_data sea liberado pero antes de que hdev->debugfs sea liberado."
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