CVE-2026-21245

HIGH

Microsoft Windows Kernel Heap-based Buffer Overflow - Privilege Escalation

Title source: llm
STIX 2.1

Description

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

References (1)

Core 1
Core References

Scores

CVSS v3 7.8
EPSS 0.0042
EPSS Percentile 33.1%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-122 CWE-787
Status published
Products (9)
Microsoft/Windows 11 Version 24H2 10.0.26100.0 - 10.0.26100.7840
Microsoft/Windows 11 Version 25H2 10.0.26200.0 - 10.0.26200.7840
Microsoft/Windows 11 version 26H1 10.0.28000.0 - 10.0.28000.1575
Microsoft/Windows 11 Version 26H1 10.0.28000.0 - 10.0.28000.1575
Microsoft/Windows Server 2025 10.0.26100.0 - 10.0.26100.32370
Microsoft/Windows Server 2025 (Server Core installation) 10.0.26100.0 - 10.0.26100.32370
microsoft/windows_11_24h2 < 10.0.26100.7781 (2 CPE variants)
microsoft/windows_11_25h2 < 10.0.26200.7781 (2 CPE variants)
microsoft/windows_server_2025 < 10.0.26100.32313
Published Feb 10, 2026
Tracked Since Feb 18, 2026