CVE-2026-83838

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Integer Underflow in Windows Bluetooth A2DP Driver

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description

Integer underflow (wrap or wraparound) in Windows Bluetooth A2DP driver allows an authorized attacker to elevate privileges over an adjacent network.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-10-13

Last Modified

2026-10-16

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-83838

EUVD

EUVD-2026-99379

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	Windows	10 Version 1607 10.0.14393.0
Microsoft	Windows	10 Version 1809 10.0.17763.0
Microsoft	Windows	10 Version 21H2 10.0.19044.0
Microsoft	Windows	10 Version 22H2 10.0.19045.0
Microsoft	Windows	11 version 23H2 10.0.22631.0
Microsoft	Windows	11 Version 23H2 10.0.22631.0
Microsoft	Windows	11 Version 24H2 10.0.26100.0
Microsoft	Windows	11 Version 25H2 10.0.26200.0
Microsoft	Windows	11 version 26H1 10.0.28000.0
Microsoft	Windows	11 Version 26H2 10.0.26300.0
Microsoft	Windows	Server 2016 10.0.14393.0
Microsoft	Windows	Server 2016 (Server Core installation) 10.0.14393.0
Microsoft	Windows	Server 2019 10.0.17763.0
Microsoft	Windows	Server 2019 (Server Core installation) 10.0.17763.0
Microsoft	Windows	Server 2022 10.0.20348.0
Microsoft	Windows	Server 2025 10.0.26100.0
Microsoft	Windows	Server 2025 (Server Core installation) 10.0.26100.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-191	The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.

Attack-Flow Graph

Executive Summary

This is an integer underflow vulnerability in the Windows Bluetooth A2DP driver. It allows an authorized attacker to escalate their privileges by exploiting a wrap-around effect in integer calculations. The flaw exists in the Bluetooth driver component of Windows operating systems.

Detection Guidance

Detection requires checking for vulnerable Windows Bluetooth A2DP driver versions. Use PowerShell commands like Get-WindowsDriver -Online -All to list installed drivers and verify versions against Microsoft's update guidance.

Impact Analysis

An attacker within adjacent network range could exploit this to gain elevated privileges on your system. This could allow them to install programs, view or delete data, or create new accounts with full user rights. Systems running affected Windows versions are at risk.

Compliance Impact

This vulnerability allows privilege escalation over an adjacent network, which could lead to unauthorized access to sensitive data. For GDPR, this may result in unauthorized processing or disclosure of personal data, violating principles of data protection and security. For HIPAA, it could enable unauthorized access to protected health information, compromising confidentiality and integrity requirements.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows Bluetooth A2DP driver. Monitor Microsoft's update guide for the specific patch release.

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