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Windows Partition Management Driver: Out-of-bounds read enables code execution

CVE-2026-83797High 8.8

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Summary

The Windows Partition Management Driver, a kernel component for disk partition management, contains an out-of-bounds read (CWE-125). According to the CVE record, an unauthorized attacker can execute code over a network. Exploitation requires user interaction (CVSS 8.8, NVD). Microsoft's CNA record lists affected Windows 10, Windows 11 and Windows Server builds.

Affected

  • Windows 10 Version 1809: 10.0.17763.0 to below 10.0.17763.9376
  • Windows 10 Version 21H2: 10.0.19044.0 to below 10.0.19044.7807
  • Windows 10 Version 22H2: 10.0.19045.0 to below 10.0.19045.7807
  • Windows 11 Version 23H2: 10.0.22631.0 to below 10.0.22631.7652
  • Windows 11 Version 24H2: 10.0.26100.0 to below 10.0.26100.9711
  • Windows 11 Version 25H2: 10.0.26200.0 to below 10.0.26200.9711
  • Windows 11 Version 26H1: 10.0.28000.0 to below 10.0.28000.3231
  • Windows 11 Version 26H2: 10.0.26300.0 to below 10.0.26300.9711
  • Windows Server 2019 (including Server Core): 10.0.17763.0 to below 10.0.17763.9376
  • Windows Server 2022: 10.0.20348.0 to below 10.0.20348.5761
  • Windows Server 2025 (including Server Core): 10.0.26100.0 to below 10.0.26100.33650

Fixed in

  • Build numbers as listed in the CVE record: 10.0.17763.9376, 10.0.19044.7807, 10.0.19045.7807, 10.0.22631.7652, 10.0.26100.9711, 10.0.26200.9711, 10.0.28000.3231, 10.0.26300.9711, 10.0.20348.5761, 10.0.26100.33650 (Server 2025)
  • Fixes are provided in Microsoft's October 2026 security updates. Verify the exact build numbers against the MSRC advisory before rollout, as third-party sources differ for some builds.

Workaround

Unknown.

Exploitation

  • CISA SSVC in the CVE record: Exploitation none, Automatable no, Technical Impact total.
  • Not listed in the CISA KEV catalog. EPSS is below 1 percent.
  • No public proof-of-concept found in searches. This does not prove that none exists.
  • A broker market interest is reported by VulDB, which indicates interest but not active exploitation.

Our recommendation

  • Patch affected hosts with the October 2026 Windows security updates as a high priority.
  • Inventory all Windows 10, Windows 11 and Windows Server systems and check their build numbers against the table above.
  • Check whether legacy systems such as Windows 10 1809 and Server 2019 still receive security updates in your environment.
  • Do not assume the systems are not internet-facing. The triggering network service is not documented in the sources, so monitor for unusual activity on affected hosts.
  • Review the MSRC advisory for any interim guidance.

Information from Microsoft (Patch Tuesday October 2026)

Severity (Microsoft)
Important
Impact
Remote code execution – Windows Partition Management Driver
Status on Patch Tuesday
Neither exploited nor publicly disclosed
Exploitability assessment
Exploitation less likely
Product family
Windows, Windows ESU (Extended Security Updates)
Updates (KB)
KB5126651, KB5126655, KB5126657, KB5126646, KB5127648, 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 31 Oct 2026, 18:30.

Original description (NVD)

Out-of-bounds read in Windows Partition Management Driver allows an unauthorized attacker to execute code over a network.

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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