CVE-2026-85921

HIGH CVSS 3.1: 8.2 EPSS 0.35%
Updated Sep 29, 2026
Microsoft
Parameter Value
CVSS 8.2 (HIGH)
Affected Versions before 10.0.28000.2956
Fixed In 10.0.28000.2956
Type CWE-415 (Double Free)
Vendor Microsoft
Public PoC No

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

Attack Parameters

Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Privileges Required
High
Admin privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Weakness Type (CWE)

Vulnerable Products 2

Configuration From (including) Up to (excluding)
Microsoft Windows_11_26h1
cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*
— 10.0.28000.2956
Microsoft Windows_11_26h1
cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*
— 10.0.28000.2956