CVE-2026-20859

HIGH

Windows Kernel-Mode Drivers - Privilege Escalation

Title source: llm
STIX 2.1

Description

Use after free in Windows Kernel-Mode Drivers allows an authorized attacker to elevate privileges locally.

References (1)

Core 1
Core References

Scores

CVSS v3 7.8
EPSS 0.0005
EPSS Percentile 15.7%
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-416
Status published
Products (7)
Microsoft/Windows 11 Version 24H2 10.0.26100.0 - 10.0.26100.7623
Microsoft/Windows 11 Version 25H2 10.0.26200.0 - 10.0.26200.7623
Microsoft/Windows Server 2025 10.0.26100.0 - 10.0.26100.32230
Microsoft/Windows Server 2025 (Server Core installation) 10.0.26100.0 - 10.0.26100.32230
microsoft/windows_11_24h2 < 10.0.26100.7623
microsoft/windows_11_25h2 < 10.0.26200.7623
microsoft/windows_server_2025 < 10.0.26100.32230
Published Jan 13, 2026
Tracked Since Feb 18, 2026