CVE-2026-33840: CWE-416: Use After Free in Microsoft Windows 11 Version 24H2
Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability, identified as CVE-2026-33840 and classified under CWE-416 (Use After Free), affects the Windows Win32K ICOMP component in Windows 11 Version 24H2 (build 10.0.26100.0). An authorized attacker with local access can exploit this flaw to elevate their privileges on the affected system. The issue arises from improper handling of memory leading to use-after-free conditions. Microsoft has released an official fix addressing this vulnerability.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate privileges, potentially gaining higher-level access to the system. The vulnerability impacts confidentiality, integrity, and availability, all rated as high impact in the CVSS vector.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft as detailed in the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33840 to remediate this vulnerability.
CVE-2026-33840: CWE-416: Use After Free in Microsoft Windows 11 Version 24H2
Description
Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.
CVSS v3.1
Score 7.8high
Affected software
Microsoft
Windows 11 Version 24H2
Microsoft
Windows 11 Version 25H2
Microsoft
Windows 11 version 26H1
Microsoft
Windows Server 2025
Microsoft
Windows Server 2025 (Server Core installation)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, identified as CVE-2026-33840 and classified under CWE-416 (Use After Free), affects the Windows Win32K ICOMP component in Windows 11 Version 24H2 (build 10.0.26100.0). An authorized attacker with local access can exploit this flaw to elevate their privileges on the affected system. The issue arises from improper handling of memory leading to use-after-free conditions. Microsoft has released an official fix addressing this vulnerability.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate privileges, potentially gaining higher-level access to the system. The vulnerability impacts confidentiality, integrity, and availability, all rated as high impact in the CVSS vector.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft as detailed in the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33840 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-03-24T00:52:01.353Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33840","vendor":"Microsoft"}]
Threat ID: 6a03653ccbff5d861008c3d0
Added to database: 05/12/2026, 17:37:00 UTC
Last enriched: 08/11/2026, 16:34:59 UTC
Last updated: 09/12/2026, 22:01:33 UTC
Views: 106
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