CVE-2025-40283

kernel: Bluetooth: btusb: reorder cleanup in btusb_disconnect to avoid UAF

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · December 6, 2025

Updated · July 30, 2026

Description

A use-after-free was found in the btusb Bluetooth driver in the Linux kernel. In btusb_disconnect(), calling usb_driver_release_interface() frees the btusb data structure, but the code subsequently accesses fields from this freed structure, causing a use-after-free condition.

Statement

This occurs during Bluetooth USB adapter disconnect. Physical access to unplug the device or control over USB subsystem is needed. The UAF happens in disconnect path, limiting attack surface.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-825 · Expired Pointer Dereference