Use After Free Vulnerability in Windows Kernel by Microsoft
CVE-2026-45657

9.8CRITICAL

Key Information:

Vendor

Microsoft
Status
Windows 11 Version 23h2
Windows 11 Version 23h2
Windows 11 Version 24h2
Windows 11 Version 25h2
Vendor
CVE Published:
9 June 2026

What is CVE-2026-45657?

A use after free vulnerability in the Windows Kernel can allow attackers to execute arbitrary code remotely via a network connection. This could lead to unauthorized access and control over affected systems, emphasizing the urgent need for timely patches and security measures.

Affected Version(s)

Windows 11 version 23H2 ARM64-based Systems 10.0.22631.0 < 10.0.22631.7219

Windows 11 Version 23H2 x64-based Systems 10.0.22631.0 < 10.0.22631.7219

Windows 11 Version 24H2 ARM64-based Systems 10.0.26100.0 < 10.0.26100.8655

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

EPSS Score

15% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.