What is CVE-2026-40397?

CVE-2026-40397 is a security advisory published by Microsoft Security Response Center (MSRC) with Elevation of Privilege severity. Windows Common Log File System Driver Elevation of Privilege Vulnerability

Which CVE IDs does CVE-2026-40397 cover?

CVE-2026-40397 covers the following CVE IDs: CVE-2026-40397. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-40397?

CVE-2026-40397 has a CVSS v3 base score of 7.8, published by Microsoft Security Response Center (MSRC).

CVE-2026-40397Elevation of PrivilegeCVSS 7.8

Windows Common Log File System Driver Elevation of Privilege Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

May 22, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-40397 →

📋 Description

<p>Integer underflow (wrap or wraparound) in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.</p>