CVE-2026-40369

Windows Kernel Elevation of Privilege Vulnerability

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

Affected

Microsoft · Windows 11 Version 24H2 · Windows 11 Version 25H2 · Windows 11 version 26H1 · Windows Server 2025 · Windows Server 2025 (Server Core installation)

CVSS v3.1 MICROSOFT

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

EPSS

0.33% chance of exploitation in the next 30 days, 25th percentile

Published

2026-05-12

Updated

2026-08-10

Proof-of-concept exploits (8)

• orinimron123/CVE-2026-40369-EXPLOIT263★ · 2026-05-18
• Joe1sn/CVE_2026_403696★ · 2026-07-23
• piffd0s/ntoskrnl-metadata4★ · 2026-05-22
• 0xBlackash/CVE-2026-403692★ · 2026-06-18
• CCELEND/CVE-2026-403690★ · 2026-06-23
• ercihan/CVE-2026-403690★ · 2026-05-22
• dbgbgtf1/cve-2026-40369-exploit0★ · 2026-09-08
• ZeroDayEvil/CVE-2026-40369-EXPLOIT

Security advisories

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40369

References

• CVE Record
• NVD entry

Related

• CVE-2022-22965
• CVE-2023-21768
• CVE-2026-33825
• CVE-2021-3310
• CVE-2026-31431
• CVE-2026-34621