CVE-2026-40369

Windows 11 24h2 vulnerability

CVSS

7.8

EPSS

4.7%

EPSS pct

91th

Exploited

No known

Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.

Affected vendor

Microsoft

Affected product

Windows 11 24h2

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness type (CWE)

CWE-822 — Untrusted Pointer Dereference

Published

2026-05-12

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable with local access, low attack complexity, requiring low privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 4.7% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 91% of all scored CVEs.

Check your external exposure to CVE-2026-40369

Confirm whether Microsoft Windows 11 24h2 is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2026-40369.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2026-40369

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