CVE-2026-85921 - Vulnerability Details - OpenCVE

Double free in Windows Secure Kernel Mode allows an authorized attacker to elevate privileges locally.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required High

Scope Changed

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable no

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Microsoft

Windows 11 version 26H1

affected

Version	Status	Constraints
`10.0.28000.0`	affected	< 10.0.28000.2956

No data.

No data.

No data.

Project Subscriptions

Vendors	Products
Microsoft Subscribe	Windows 11 26h1 Subscribe

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References

Link	Providers
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85921

History

Mon, 14 Sep 2026 21:00:00 +0000

Type	Values Removed	Values Added
Description		Double free in Windows Secure Kernel Mode allows an authorized attacker to elevate privileges locally.
Title		Windows Secure Kernel Mode Elevation of Privilege Vulnerability
First Time appeared		Microsoft Microsoft windows 11 26h1
Weaknesses		CWE-415
CPEs		cpe:2.3:o:microsoft:windows_11_26H1:::::::x64:*
Vendors & Products		Microsoft Microsoft windows 11 26h1
References		https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85921
Metrics		cvssV3_1 `{'score': 8.2, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C'}` ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Projects

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MITRE

Status: PUBLISHED

Assigner: microsoft

Published: 2026-09-14T17:19:07.991Z

Updated: 2026-09-14T22:50:47.958Z

Reserved: 2026-09-04T18:24:41.250Z

Link: CVE-2026-85921

Vulnrichment

Updated: 2026-09-14T19:15:02.675Z

NVD

Status : Received

Published: 2026-09-14T18:20:20.047

Modified: 2026-09-14T20:17:00.207

Link: CVE-2026-85921

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

CWE-415

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