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CVE-2026-40369

7.8 HIGH

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

Published: 2026-05-12 · Last updated: 2026-06-01

Severity and scoring

CVSS
7.8 HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-822

Affected products

VendorProduct
microsoftwindows_11_24h2, windows_11_25h2, windows_11_26h1

Description

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

Source: NVD

References

Related CVEs

Same vendor

  • CVE-2026-50507 Protection mechanism failure in Windows BitLocker allows an unauthorized attacker to bypass a security feature with a physical attack (6.8 MEDIUM)
  • CVE-2026-49160 Uncontrolled resource consumption in HTTP/2 allows an unauthorized attacker to deny service over a network (7.5 HIGH)
  • CVE-2026-48583 Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally (7.8 HIGH)
  • CVE-2026-48578 Protection mechanism failure in Windows Secure Boot allows an authorized attacker to bypass a security feature locally (7.9 HIGH)
  • CVE-2026-48576 Protection mechanism failure in Windows Secure Boot allows an authorized attacker to bypass a security feature locally (7.9 HIGH)

Same CWE

  • CVE-2026-45645 Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally (7.8 HIGH)
  • CVE-2026-45643 Untrusted pointer dereference in Microsoft Office Word allows an unauthorized attacker to execute code locally (7.8 HIGH)
  • CVE-2026-45471 Untrusted pointer dereference in Microsoft Office Word allows an unauthorized attacker to execute code locally (7.8 HIGH)
  • CVE-2026-44805 Use after free in Windows Network Controller (NC) Host Agent allows an authorized attacker to deny service locally (5.5 MEDIUM)
  • CVE-2026-8835 IBM HTTP Server 8.5, and 9.0 is vulnerable to invalid pointer dereference (7.3 HIGH)