CVE-2026-83939: CWE-822: Untrusted Pointer Dereference in Microsoft Windows 11 version 26H1
Description
Untrusted pointer dereference in Windows Secure Kernel Mode allows an authorized attacker to elevate privileges locally.
CVSS v3.1
Score 8.2high
Affected software
Microsoft
Windows 11 version 26H1
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-83939 is a vulnerability classified as CWE-822 (Untrusted Pointer Dereference) affecting Windows 11 version 26H1. The flaw exists in the Windows Secure Kernel Mode and permits an authorized local attacker to elevate privileges by exploiting improper handling of pointers. The vulnerability has a CVSS 3.1 base score of 8.2, indicating high severity, with impacts on confidentiality, integrity, and availability. Microsoft has published an official fix for this vulnerability.
Potential Impact
An authorized local attacker can exploit this vulnerability to elevate privileges, potentially gaining full control over the affected system. This can lead to complete compromise of confidentiality, integrity, and availability of the system.
Mitigation Recommendations
An official fix is available from Microsoft. It is recommended to apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83939 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-31T23:40:59.640Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83939","vendor":"Microsoft"}]
Threat ID: 6aa04575acd9273b49fbba68
Added to database: 09/08/2026, 17:27:17 UTC
Last enriched: 10/14/2026, 22:10:51 UTC
Last updated: 10/23/2026, 15:10:15 UTC
Views: 40
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