CVE-2026-40397: CWE-191: Integer Underflow (Wrap or Wraparound) in Microsoft Windows 10 Version 1607
Integer underflow (wrap or wraparound) in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability involves an integer underflow (wrap or wraparound) condition in the Windows Common Log File System Driver in Windows 10 Version 1607 (build 10.0.14393.0). An authorized attacker with local access can exploit this flaw to elevate their privileges, potentially gaining higher system rights. The vulnerability is tracked as CWE-191. Microsoft has published an official security update to remediate this issue.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate privileges, potentially leading to full system compromise or unauthorized actions requiring higher privileges. The confidentiality, integrity, and availability of the system can be fully impacted as indicated by the CVSS vector (C:H/I:H/A:H). No public exploits are currently known.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40397 to remediate this vulnerability. No additional mitigation steps are indicated by the vendor.
CVE-2026-40397: CWE-191: Integer Underflow (Wrap or Wraparound) in Microsoft Windows 10 Version 1607
Description
Integer underflow (wrap or wraparound) in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves an integer underflow (wrap or wraparound) condition in the Windows Common Log File System Driver in Windows 10 Version 1607 (build 10.0.14393.0). An authorized attacker with local access can exploit this flaw to elevate their privileges, potentially gaining higher system rights. The vulnerability is tracked as CWE-191. Microsoft has published an official security update to remediate this issue.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate privileges, potentially leading to full system compromise or unauthorized actions requiring higher privileges. The confidentiality, integrity, and availability of the system can be fully impacted as indicated by the CVSS vector (C:H/I:H/A:H). No public exploits are currently known.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40397 to remediate this vulnerability. No additional mitigation steps are indicated by the vendor.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-04-13T00:27:50.797Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40397","vendor":"Microsoft"}]
Threat ID: 6a036554cbff5d861008c968
Added to database: 5/12/2026, 5:37:24 PM
Last enriched: 5/12/2026, 6:51:51 PM
Last updated: 5/13/2026, 4:51:53 AM
Views: 2
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