CVE-2026-40409: CWE-197: Numeric Truncation Error in Microsoft Windows 10 Version 1607
Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability
AI Analysis
Technical Summary
This vulnerability (CVE-2026-40409) involves a numeric truncation error (CWE-197) in the Windows Universal Disk Format File System Driver on Windows 10 Version 1607 (build 10.0.14393.0). The flaw could be exploited to elevate privileges on the affected system. Microsoft has published an official fix to remediate the vulnerability. The CVSS 3.1 vector indicates it requires local access with low complexity and privileges, no user interaction, and impacts confidentiality, integrity, and availability with high severity.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker with limited privileges on a Windows 10 Version 1607 system to elevate their privileges to a higher level, potentially gaining full control over the affected system. This could lead to complete compromise of confidentiality, integrity, and availability of the system.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft for Windows 10 Version 1607 as detailed in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40409. Applying this update will remediate the vulnerability.
CVE-2026-40409: CWE-197: Numeric Truncation Error in Microsoft Windows 10 Version 1607
Description
Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability
CVSS v3.1
Score 7.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-40409) involves a numeric truncation error (CWE-197) in the Windows Universal Disk Format File System Driver on Windows 10 Version 1607 (build 10.0.14393.0). The flaw could be exploited to elevate privileges on the affected system. Microsoft has published an official fix to remediate the vulnerability. The CVSS 3.1 vector indicates it requires local access with low complexity and privileges, no user interaction, and impacts confidentiality, integrity, and availability with high severity.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker with limited privileges on a Windows 10 Version 1607 system to elevate their privileges to a higher level, potentially gaining full control over the affected system. This could lead to complete compromise of confidentiality, integrity, and availability of the system.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft for Windows 10 Version 1607 as detailed in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40409. Applying this update will remediate the vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-04-13T00:27:50.798Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40409","vendor":"Microsoft"}]
Threat ID: 6a284cbb8dd33fbd8566452d
Added to database: 06/09/2026, 17:26:19 UTC
Last enriched: 07/29/2026, 21:45:38 UTC
Last updated: 07/31/2026, 19:30:13 UTC
Views: 68
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