CVE-2026-20838

Windows Kernel Information Disclosure Vulnerability

State: Published
Severity: 5.5 Medium
Published: Jan 13, 2026
Updated: Jul 30, 2026
Reserved: Dec 3, 2025

Description

Generation of error message containing sensitive information in Windows Kernel allows an authorized attacker to disclose information locally.

Scores

CVSS	Score	Vector	Source
3.1	5.5 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-209 Generation of Error Message Containing Sensitive Information

Affected Products

Product	Versions
Windows 11 version 23H2Microsoft	10.0.22631.0 to before 10.0.22631.6491Affected
Windows 11 Version 23H2Microsoft	10.0.22631.0 to before 10.0.22631.6491Affected
Windows 11 Version 24H2Microsoft	10.0.26100.0 to before 10.0.26100.7623Affected
Windows 11 Version 25H2Microsoft	10.0.26200.0 to before 10.0.26200.7623Affected
Windows Server 2022Microsoft	10.0.20348.0 to before 10.0.20348.4648Affected
Windows Server 2022, 23H2 Edition (Server Core installation)Microsoft	10.0.25398.0 to before 10.0.25398.2092Affected
Windows Server 2025Microsoft	10.0.26100.0 to before 10.0.26100.32230Affected
Windows Server 2025 (Server Core installation)Microsoft	10.0.26100.0 to before 10.0.26100.32230Affected

References

Windows Kernel Information Disclosure Vulnerabilityvendor-advisorypatch

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