CRITICAL 9.8 Microsoft

CVE-2026-45657

Windows Kernel Remote Code Execution Vulnerability

Microsoft Security Update 2026-Jun: Windows Kernel Remote Code Execution Vulnerability

Affected Products

Windows Server 2022
Windows Server 2022 (Server Core installation)
Windows Server 2025 (Server Core installation)
Windows 11 Version 25H2 for ARM64-based Systems
Windows 11 Version 25H2 for x64-based Systems
Windows 11 Version 23H2 for ARM64-based Systems
Windows 11 Version 23H2 for x64-based Systems
Windows 11 Version 24H2 for ARM64-based Systems

References

Published: 2026-06-09 · Source: Microsoft · Feed updated: 2026-08-04

This critical severity vulnerability with a CVSS score of 9.8 was published on 2026-06-09 via Microsoft. EPSS score: 15.5% (top 4% of all CVEs by exploitation probability). Affected: Windows Server 2022, Windows Server 2022 (Server Core installation), Windows Server 2025 (Server Core installation) and 5 more.

Risk Timeline

CVE Disclosed2026-06-09 · 55 days ago

Remediation Resources

Official Advisory

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45657

NVD / MITRE

nvd.nist.gov/vuln/detail/CVE-2026-45657

Related Vulnerabilities

CVE	Title	Severity	CVSS
CVE-2026-57092	Microsoft Windows VMSwitch Elevation of Privilege Vulnerability	CRITICAL	9.9
CVE-2026-42990	SQL Server ODBC driver Elevation of Privilege Vulnerability	CRITICAL	9.8
CVE-2026-49172	Windows FTP Service Remote Code Execution Vulnerability	CRITICAL	9.8
CVE-2026-54990	Remote Desktop Client Remote Code Execution Vulnerability	CRITICAL	9.8
CVE-2026-50447	Windows Message Queuing Service (MSMQ) Remote Code Execution Vulnerability	CRITICAL	9.8
CVE-2026-50518	Windows DHCP Server Remote Code Execution Vulnerability	CRITICAL	9.8

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