Description
Double free in Microsoft Failover Cluster Virtual Driver allows an unauthorized attacker to execute code over a network.
Published: 2026-10-13
Score: 9.8 Critical
EPSS: < 1% Very Low
KEV: No
Impact: Remote Code Execution
Action: Immediate Patch
AI Analysis

Impact

This vulnerability is a double free in the Microsoft Failover Cluster Virtual Driver that can be triggered by an attacker with network access. It permits the attacker to execute arbitrary code with the privileges of the cluster driver, potentially compromising the entire system and allowing lateral movement to other systems in the network.

Affected Systems

Affected Microsoft products include Windows 10 versions 1607 and 1809, Windows Server 2012 and Server 2012 (Server Core), Windows Server 2012 R2 and Server 2012 R2 (Server Core), Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025. All enumerated versions are impacted as listed in the CNA vendor/product inventory.

Risk and Exploitability

The CVSS base score of 9.8 marks this as a critical vulnerability with remote code execution potential. The EPSS score is not available, and the vulnerability is not yet listed in CISA's KEV catalog. Attackers can exploit this weakness over a network by interacting with the cluster driver, so the likelihood of exploitation is high on any exposed instance until patched.

Generated by OpenCVE AI on October 14, 2026 at 11:32 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the Microsoft security update that fixes the double free in the Failover Cluster Virtual Driver to all affected Windows Server 2012 through 2025 and Windows 10 1607/1809 installations.
  • Immediately isolate vulnerable servers from untrusted networks or implement strict firewall rules that block inbound communication to the cluster driver ports until the patch is applied.
  • Configure log monitoring for cluster driver activity to detect any unauthorized attempts after patching.

Generated by OpenCVE AI on October 14, 2026 at 11:32 UTC.

Tracking

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Advisories

No advisories yet.

History

Wed, 28 Oct 2026 17:00:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:x64:*

Sat, 24 Oct 2026 20:00:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft windows Server 2012 (server Core Installation)
Microsoft windows Server 2012 R2
Microsoft windows Server 2012 R2 (server Core Installation)
Microsoft windows Server 2016 (server Core Installation)
Microsoft windows Server 2019 (server Core Installation)
Microsoft windows Server 2025 (server Core Installation)
Vendors & Products Microsoft windows Server 2012 (server Core Installation)
Microsoft windows Server 2012 R2
Microsoft windows Server 2012 R2 (server Core Installation)
Microsoft windows Server 2016 (server Core Installation)
Microsoft windows Server 2019 (server Core Installation)
Microsoft windows Server 2025 (server Core Installation)

Wed, 14 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Tue, 13 Oct 2026 19:15:00 +0000

Type Values Removed Values Added
Description Double free in Microsoft Failover Cluster Virtual Driver allows an unauthorized attacker to execute code over a network.
Title Microsoft Failover Cluster Virtual Driver Remote Code Execution Vulnerability
First Time appeared Microsoft
Microsoft windows 10 1607
Microsoft windows 10 1809
Microsoft windows Server 2012
Microsoft windows Server 2012 R2
Microsoft windows Server 2016
Microsoft windows Server 2019
Microsoft windows Server 2022
Microsoft windows Server 2025
Weaknesses CWE-415
CPEs cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_server_2012:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2012_R2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft windows 10 1607
Microsoft windows 10 1809
Microsoft windows Server 2012
Microsoft windows Server 2012 R2
Microsoft windows Server 2016
Microsoft windows Server 2019
Microsoft windows Server 2022
Microsoft windows Server 2025
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'}

Subscriptions

Microsoft Windows 10 1607 Windows 10 1809 Windows Server 2012 Windows Server 2012 (server Core Installation) Windows Server 2012 R2 Windows Server 2012 R2 Windows Server 2012 R2 (server Core Installation) Windows Server 2016 Windows Server 2016 (server Core Installation) Windows Server 2019 Windows Server 2019 (server Core Installation) Windows Server 2022 Windows Server 2025 Windows Server 2025 (server Core Installation)
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-10-31T18:07:09.063Z

Reserved: 2026-09-23T18:05:21.201Z

Link: CVE-2026-96864

cve-icon Vulnrichment

Updated: 2026-10-13T19:41:44.632Z

cve-icon NVD

Status : Analyzed

Published: 2026-10-13T19:22:00.717

Modified: 2026-10-28T16:51:08.480

Link: CVE-2026-96864

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-24T19:45:17Z

Weaknesses