CVE-2026-45657: CWE-416: Use After Free in Microsoft Windows 11 version 23H2
Use after free in Windows Kernel allows an unauthorized attacker to execute code over a network.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-45657) is a use-after-free condition in the Windows Kernel of Windows 11 version 23H2 (build 10.0.22631.0). It enables remote code execution by an unauthenticated attacker over the network, without requiring user interaction or privileges. The vulnerability is classified under CWE-416 (Use After Free). Microsoft has published an official fix to address this issue.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary code remotely on affected systems, leading to full compromise of confidentiality, integrity, and availability. The attacker does not need any privileges or user interaction, making this a highly critical security risk.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45657 to remediate this vulnerability.
CVE-2026-45657: CWE-416: Use After Free in Microsoft Windows 11 version 23H2
Description
Use after free in Windows Kernel allows an unauthorized attacker to execute code over a network.
CVSS v3.1
Score 9.8critical
Affected software
Microsoft
Windows 11 version 23H2
Microsoft
Windows 11 Version 23H2
Microsoft
Windows 11 Version 24H2
Microsoft
Windows 11 Version 25H2
Microsoft
Windows 11 version 26H1
Microsoft
Windows Server 2022
Microsoft
Windows Server 2025
Microsoft
Windows Server 2025 (Server Core installation)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-45657) is a use-after-free condition in the Windows Kernel of Windows 11 version 23H2 (build 10.0.22631.0). It enables remote code execution by an unauthenticated attacker over the network, without requiring user interaction or privileges. The vulnerability is classified under CWE-416 (Use After Free). Microsoft has published an official fix to address this issue.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary code remotely on affected systems, leading to full compromise of confidentiality, integrity, and availability. The attacker does not need any privileges or user interaction, making this a highly critical security risk.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45657 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-05-12T20:33:35.158Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45657","vendor":"Microsoft"}]
Threat ID: 6a284cec8dd33fbd85664fa2
Added to database: 06/09/2026, 17:27:08 UTC
Last enriched: 08/14/2026, 13:45:50 UTC
Last updated: 09/14/2026, 22:01:34 UTC
Views: 251
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