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Windows USB Driver: Heap-based buffer overflow enables local privilege escalation

CVE-2026-83638High 7.8

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Summary

A heap-based buffer overflow (CWE-122) in the Windows USB driver affects many Windows 10, Windows 11 and Windows Server versions, including Windows 10 Version 1607 and Windows Server 2016. An attacker with a low-privileged local account can exploit it to gain higher privileges, up to SYSTEM. Remote exploitation is not possible; the attacker needs prior local access, for example after phishing or malware infection.

Affected

  • Windows 10 Version 1607 (before 10.0.14393.9612)
  • Windows 10 Version 1809 (before 10.0.17763.9376)
  • Windows 10 Version 21H2 (before 10.0.19044.7807)
  • Windows 10 Version 22H2 (before 10.0.19045.7807)
  • Windows 11 Version 23H2 (before 10.0.22631.7652)
  • Windows 11 Version 24H2 (before 10.0.26100.9711)
  • Windows 11 Version 25H2 (before 10.0.26200.9711)
  • Windows 11 Version 26H1 (before 10.0.28000.3231)
  • Windows 11 Version 26H2 (before 10.0.26300.9711)
  • Windows Server 2012 and 2012 R2 (before 6.2.9200.26434 and 6.3.9600.23470)
  • Windows Server 2016 (before 10.0.14393.9612)

Fixed in

  • Windows 10 Version 1607 and Windows Server 2016: 10.0.14393.9612
  • Windows 10 Version 1809: 10.0.17763.9376
  • Windows 10 Version 21H2: 10.0.19044.7807
  • Windows 10 Version 22H2: 10.0.19045.7807
  • Windows 11 Version 23H2: 10.0.22631.7652
  • Windows 11 Version 24H2 and 25H2, Version 26H2: 10.0.26100.9711 and 10.0.26200.9711 and 10.0.26300.9711
  • Windows 11 Version 26H1: 10.0.28000.3231
  • Windows Server 2012 and 2012 R2: see the MSRC advisory for the fixed builds

Workaround

Unknown.

  • No vendor-published workaround found in the sources reviewed.
  • Check the MSRC advisory for an official mitigation.

Exploitation

  • Not listed in the CISA KEV catalog; no known exploitation in the wild.
  • EPSS score below 1 percent (very low).
  • CISA SSVC: exploitation none, not automatable, total technical impact.
  • No public proof of concept found in the searches performed.

Our recommendation

  • Inventory all Windows 10 Version 1607 and Windows Server 2016 systems; these may be out of support, so plan upgrades or extended security coverage where available.
  • Install the October 2026 cumulative updates on all supported systems; verify the build numbers against the MSRC advisory.
  • Restrict local logon and USB device use on affected hosts until patched.
  • Monitor for exploit publications and changes in the KEV catalog.

Information from Microsoft (Patch Tuesday October 2026)

Severity (Microsoft)
Important
Impact
Elevation of privilege – Windows USB Driver
Status on Patch Tuesday
Neither exploited nor publicly disclosed
Exploitability assessment
Exploitation unlikely
Product family
Windows, Windows ESU (Extended Security Updates)
Updates (KB)
KB5127648, KB5126651, KB5126655, KB5126657, KB5126646, KB5126653

Entry in the Microsoft Security Update Guide

Public exploits

PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.

Research sources

Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 2 Nov 2026, 03:27.

Original description (NVD)

Heap-based buffer overflow in Windows USB Driver allows an authorized attacker to elevate privileges locally.

NVD references (1)

Sources

The tracker combines official, freely usable data sources – updated continuously:

This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.

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