PT-2026-40221 · Microsoft · Windows Kernel-Mode Driver+1

Published 2026-05-12 · Updated 2026-05-12 · CVE-2026-40408

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Windows Kernel-Mode Drivers (affected versions not specified)

Description A use-after-free issue in Windows Kernel-Mode Drivers allows an authorized attacker to elevate privileges locally. Use-after-free is a memory corruption flaw that occurs when an application continues to use a pointer after it has been freed.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

BDU:2026-07121

CVE-2026-40408

Affected Products

Windows

Windows Kernel-Mode Driver

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-40408 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-40408 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40408 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-07121 · Security Note
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-40408 · Vendor Advisory