CVE-2026-40369

high

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

Vendor / product: Microsoft — windows 11 24h2

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

CVSS

7.8

7.8 (CVSS v3.1)

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

Severity source: NVD CVSS v3.1 (secure@microsoft.com)

Timeline (UTC)

Published: 2026-05-12 18:17

Modified: 2026-11-03 23:17

NVD status: Modified

Last synced 1 day ago

Verified against the source API 2026-11-03 23:24 UTC

Exploitation

Not listed in CISA KEV (as of last catalog sync)

Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

microsoft / windows_11_24h2 <10.0.26100.8390

microsoft / windows_11_25h2 <10.0.26200.8390

microsoft / windows_11_26h1 <10.0.28000.2113

microsoft / windows_server_2025 <10.0.26100.32772

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

NVD CVE API 2.0 — fetched 2026-11-03 23:24 UTC · record ↗