CVE-2026-23671
📋 TL;DR
A race condition vulnerability in Windows Bluetooth RFCOM Protocol Driver allows an authenticated attacker to execute code with elevated privileges on the local system. This affects Windows systems with Bluetooth functionality enabled. Attackers need local access to exploit this vulnerability.
💻 Affected Systems
- Windows Bluetooth RFCOM Protocol Driver
📦 What is this software?
Windows 10 1607 by Microsoft
Windows 10 1607 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 21h2 by Microsoft
Windows 10 21h2 by Microsoft
Windows 10 21h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 11 23h2 by Microsoft
Windows 11 23h2 by Microsoft
Windows 11 24h2 by Microsoft
Windows 11 24h2 by Microsoft
Windows 11 25h2 by Microsoft
Windows 11 25h2 by Microsoft
Windows 11 26h1 by Microsoft
Windows 11 26h1 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with SYSTEM-level privileges, allowing installation of malware, data theft, and persistence mechanisms.
Likely Case
Local privilege escalation from standard user to administrator/SYSTEM privileges, enabling lateral movement and further exploitation.
If Mitigated
Limited impact with proper access controls, monitoring, and patching in place.
🎯 Exploit Status
Requires race condition exploitation which can be challenging but feasible for skilled attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft Security Update Guide for specific KB numbers
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23671
Restart Required: Yes
Instructions:
1. Open Windows Update settings
2. Check for updates
3. Install all security updates
4. Restart system when prompted
🔧 Temporary Workarounds
Disable Bluetooth RFCOM Protocol
windowsDisable the vulnerable Bluetooth RFCOM protocol driver to prevent exploitation
sc config bthrfcom start= disabled
sc stop bthrfcom
Disable Bluetooth Service
windowsCompletely disable Bluetooth service if not required
sc config BluetoothUserService start= disabled
sc stop BluetoothUserService
🧯 If You Can't Patch
- Implement strict access controls to limit local user privileges
- Enable Windows Defender Exploit Guard and configure Attack Surface Reduction rules
🔍 How to Verify
Check if Vulnerable:
Check Windows version and installed updates against Microsoft advisoryCheck Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify security update KB number is installed via 'wmic qfe list' or Settings > Update & Security > View update history📡 Detection & Monitoring
Log Indicators:
- Unusual process creation from Bluetooth services
- Privilege escalation attempts
- Unexpected driver loading
Network Indicators:
- Local Bluetooth protocol anomalies
SIEM Query:
EventID=4688 AND (ProcessName LIKE '%rfcom%' OR ParentProcessName LIKE '%rfcom%') AND NewProcessName NOT LIKE '%system%'