High severity · published Sep 8, 2026
CVE-2026-83939
Windows Secure Kernel Mode Elevation of Privilege Vulnerability
8.2
CVSS
0.3%
EPSS
No
On KEV
Description
Untrusted pointer dereference in Windows Secure Kernel Mode allows an authorized attacker to elevate privileges locally.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 28% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
W1
Windows 11 version 26H1 · Microsoft
10.0.28000.0 before 10.0.28000.2954 · source: vendor
W1
Windows 11 26h1 · Microsoft
before 10.0.28000.2954; before 10.0.28000.2954 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-83939
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-83939
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83939
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