What is the CVSS score of CVE-2026-45640?

CVE-2026-45640 has a contested CVSS base score of 7.0 from a third party (e.g. CISA-ADP), while the vendor rates it High. vuln.today uses the vendor rating as authoritative.

Which versions of Windows Bluetooth Driver are affected by CVE-2026-45640?

CVE-2026-45640 is a local privilege escalation vulnerability in the Windows Bluetooth Port Driver that allows low-privileged users with system access to gain administrative privileges.. A patch is available.

How to fix or mitigate CVE-2026-45640?

Within 24 hours: Identify and inventory Windows systems with Bluetooth drivers active and low-privileged user accounts. Within 7 days: Disable Bluetooth on systems where not operationally required, implement access controls to restrict low-privileged users' interaction with driver resources, and enable monitoring for privilege escalation attempts. Within 30 days: Establish regular monitoring of Microsoft Security Response Center advisories for patch availability and evaluate EDR solutions capable of detecting kernel-mode driver exploits.

Windows Bluetooth Driver CVE-2026-45640

EUVD-2026-35684 HIGH

Use After Free (CWE-416)

2026-06-09 secure@microsoft.com

GHSA-p23p-88jv-fvg5

Microsoft Use After Free Memory Corruption Denial Of Service Windows 10 21h2 Windows 10 22h2 Windows 11 23h2 Windows 11 24h2 Windows 11 25h2 Windows 11 26h1 Windows Server 2022 Windows Server 2025

High

Disputed · 7.0 Vendor: microsoft

Temporal: 6.1

Severity by source

Sources disagree (Medium–Critical)

Vendor (microsoft) PRIMARY

7.0 HIGH

AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

ENISA EUVD

CRITICAL

qualitative

CIRCL (temporal)

6.1 MEDIUM

cvss

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: microsoft

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

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Patch available

Jun 09, 2026 - 19:03 EUVD

Analysis Generated

Jun 09, 2026 - 18:05 vuln.today

CVE Published

Jun 09, 2026 - 17:17 nvd

HIGH 7.0

DescriptionCVE.org

Use after free in Windows Bluetooth Port Driver allows an authorized attacker to elevate privileges locally.

AnalysisAI

Local privilege escalation in the Windows Bluetooth Port Driver allows an authorized low-privileged attacker to elevate to higher privileges by triggering a use-after-free condition in the kernel-mode driver. The flaw is reported by Microsoft Security Response Center and carries a CVSS 7.0 (high) rating with high attack complexity, and no public exploit identified at time of analysis. EPSS data and CISA KEV status were not provided in the input, so widespread exploitation is not confirmed.

Technical ContextAI

The vulnerability resides in the Windows Bluetooth Port Driver, a kernel-mode component (typically BthPort.sys) that mediates communication between the Bluetooth stack and underlying transport drivers. The root cause is CWE-416 (Use After Free), where memory is referenced after it has been freed - commonly triggered by race conditions between IRP (I/O Request Packet) handling, device arrival/removal events, or concurrent IOCTL invocations against the driver. Successful exploitation of a UAF in a kernel driver typically yields kernel-mode code execution, enabling full SYSTEM-level compromise of the host. No CPE strings were provided in the input, so the specific affected Windows builds must be retrieved from Microsoft's update guide.

RemediationAI

Patch available per vendor advisory - apply the Microsoft security update referenced at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45640 via Windows Update or WSUS as soon as it appears in your patch cycle, selecting the KB matching each affected Windows build. Where patching must be deferred, the most effective compensating control is to disable the Bluetooth service (bthserv) and unload/disable the Bluetooth radio in Device Manager on systems that do not require wireless peripherals, which fully removes the attack surface but breaks Bluetooth keyboards, mice, headsets, and proximity-unlock features. On managed fleets, you can additionally restrict local logon to trusted accounts (since PR:L is required) via Group Policy 'Deny log on locally' to limit who can stage the local trigger. Standard kernel-mode mitigations such as Hypervisor-protected Code Integrity (HVCI) and Virtualization-Based Security (VBS) raise the bar for converting the UAF into reliable SYSTEM execution but do not eliminate the bug.