CVE-2025-40301
Description
A flaw was found in the Linux kernel's Bluetooth component. A local attacker with low privileges could exploit a vulnerability in the Host Controller Interface (HCI) event processing. This issue arises from improper handling of command complete events with unknown opcodes, which can lead to the system attempting to read from uninitialized memory. Successful exploitation could result in the disclosure of sensitive information or cause the system to become unavailable (a denial of service).
Mitigation
To mitigate this issue, disable the Bluetooth kernel module if Bluetooth functionality is not required. This can be achieved by blacklisting the `bluetooth` module. Create a file named `/etc/modprobe.d/disable-bluetooth.conf` with the following content: `blacklist bluetooth`. A system reboot is required for this change to take effect. Disabling Bluetooth may impact functionality that relies on Bluetooth connectivity.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.1 | N/A | 7.6 |
| Attack Vector | Local | N/A | Adjacent Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | Low |
| Integrity Impact | None | N/A | Low |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
cve.org: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
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