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CVE-2026-85921CriticalRevised 25 Sep

Windows Secure Kernel Mode Elevation of Privilege Vulnerability

MSRC advisory NVD CVE.org

Assessment

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

Severity
Critical
CVSS base score
8.2CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
Impact
Elevation of Privilege
EPSS, next 30 days
0.4%Higher than 26.8% of scored CVEs · FIRST model run 26 Sep 2026 · about EPSS
Exploitability
Exploitation Less Likely
Publicly disclosed
No
Customer action
Required: apply the update
Component
Windows Secure Kernel Mode
Weakness
CWE-415: Double Free
Issued by
Microsoft
Published
14 Sep 2026 · September 2026
Last revised
25 Sep 2026Updated an acknowledgement. This is an informational change only.

Updates that fix it

1 KB
KBTypeRestartApplies toOther CVEs
KB5129194 Security Update Required Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems All CVEs in KB5129194

Affected products

Windows
2 affected products
  • Windows 11 Version 26H1 for ARM64-based Systems
  • Windows 11 version 26H1 for x64-based Systems
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