Security September 2026 Latest record Windows Secure Kernel Mode Elevation of Privilege Vulnerability Recorded 22 Oct 2026 at 17:33 UTC. This is what ChangeIntel recorded, including the title, summary, facts and links. It is not a statement of the source's current position.
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The historical field “Public exploit code” recorded Nuclei detection-template membership. It did not establish exploit availability. The original recorded fields remain below.
The historical “Publicly disclosed: No” field could represent a missing MSRC assessment. It does not establish that the vulnerability was undisclosed. The original recorded fields remain below.
CVE Microsoft Security Response Center
Windows Secure Kernel Mode Elevation of Privilege Vulnerability Double free in Windows Secure Kernel Mode allows an authorized attacker to elevate privileges locally.
CVE CVE-2026-85921
Severity Critical
CVSS base score 8.2
CVSS 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
Impact Elevation of Privilege
Exploitation detected Not reported by MSRC
Publicly disclosed No
Exploitability Exploitation Less Likely
Component Windows Secure Kernel Mode
Weakness CWE-415: Double Free
Issued by Microsoft
Customer action Required: apply the update
Affected products Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems
Updates that fix it KB5129194: Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems (restart required)
CISA KEV Not listed in the collected catalog
EPSS 0.3%; scored 22 Oct 2026
Public exploit code No Nuclei template listed
Published 14 Sep 2026 07:00 UTC
Last revised 27 Sep 2026 07:00 UTC
Revision note Acknowledgement Updated
Microsoft security releases Complete at observationRead 22 Oct 2026 at 17:32 UTC
CISA KEV Complete at observationRead 22 Oct 2026 at 17:32 UTC
FIRST EPSS Complete at observationRead 22 Oct 2026 at 17:32 UTC
Public detection templates (Nuclei) Complete at observationRead 22 Oct 2026 at 17:32 UTC Coverage describes the sources at this observation. A complete read then does not establish their current position.
Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.
Cite this version Field-level log (10)
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22 Oct 2026 · 17:33:15 UTC
EPSS 0.3%; scored 21 Oct 2026 → 0.3%; scored 22 Oct 2026 21 Oct 2026 · 21:47:24 UTC
EPSS 0.3%; scored 20 Oct 2026 → 0.3%; scored 21 Oct 2026 20 Oct 2026 · 20:53:31 UTC
EPSS 0.3%; scored 19 Oct 2026 → 0.3%; scored 20 Oct 2026 19 Oct 2026 · 15:12:40 UTC
EPSS 0.3%; scored 18 Oct 2026 → 0.3%; scored 19 Oct 2026 18 Oct 2026 · 14:54:30 UTC
EPSS 0.3%; scored 16 Oct 2026 → 0.3%; scored 18 Oct 2026 18 Oct 2026 · 14:54:30 UTC
Link: September 2026 /security?release=2026-Sep#cves 16 Oct 2026 · 16:13:25 UTC
EPSS 0.3%; scored 15 Oct 2026 → 0.3%; scored 16 Oct 2026 15 Oct 2026 · 21:30:54 UTC
EPSS 0.3%; scored 14 Oct 2026 → 0.3%; scored 15 Oct 2026 15 Oct 2026 · 01:07:54 UTC
EPSS 0.3%; scored 13 Oct 2026 → 0.3%; scored 14 Oct 2026 14 Oct 2026 · 11:22:42 UTC
Source coverage: msrc-cvrf Incomplete → Current