Local privilege escalation via untrusted pointer dereference
Published Sep 8, 2026 · Updated Sep 9, 2026
Untrusted pointer dereference in Microsoft Windows Secure Kernel Mode before build 10.0.28000.2954 allows local users to elevate privileges. Secure Kernel Mode dereferences an attacker-influenced pointer, but Microsoft has not disclosed the affected function or pointer-validation failure. Exploitation requires an authorized local user with high privileges and no user interaction, and successful exploitation crosses a security boundary with confidentiality, integrity, and availability impact.
Summary
What happened
Untrusted pointer dereference in Microsoft Windows Secure Kernel Mode before build 10.0.28000.2954 allows local users to elevate privileges. Secure Kernel Mode dereferences an attacker-influenced pointer, but Microsoft has not disclosed the affected function or pointer-validation failure. Exploitation requires an authorized local user with high privileges and no user interaction, and successful exploitation crosses a security boundary with confidentiality, integrity, and availability impact.
The record
- CVE
- CVE-2026-83939
- Published
- Sep 8, 2026
- Updated
- Sep 9, 2026
- Vendor
- Microsoft
- Product
- Windows 11, version 26H1
- Classifications
- CWE-822, T1068
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.28000.0 <10.0.28000.2954
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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