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CVE-2025-39861

7.8 · HIGH

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 fun…

Published Sep 19, 2025CWE-416EPSS 0.16%

Overview

CVE-2025-39861 is a high-severity vulnerability. It was published on September 19, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/1503756fffe76d5aea2371a4b8dee20c3577bcfdRefgit.kernel.org/stable/c/28010791193a4503f054e8d69a950ef815deb539Refgit.kernel.org/stable/c/7cc08f2f127b9a66f46ea918e34353811a7cb378Refgit.kernel.org/stable/c/bd75eba88e88d7b896b0c737b02a74a12afc235f

How CyberStrike helps

Frequently asked questions

What is CVE-2025-39861?

CVE-2025-39861 is a high-severity vulnerability. It was published on September 19, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-39861?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-39861?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-39861?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-39861 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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