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) involves a use-after-free condition in the Windows Kernel on Windows 11 version 23H2 (build 10.0.22631.0). Exploitation allows remote code execution by an unauthenticated attacker over the network, impacting confidentiality, integrity, and availability with a CVSS 3.1 base score of 9.8 (critical). Microsoft has released an official fix to remediate this vulnerability as documented in their security update guide.
Potential Impact
Successful exploitation enables an attacker to execute arbitrary code remotely on affected Windows 11 systems without requiring privileges or user interaction, potentially leading to full system compromise including complete control over the affected device.
Mitigation Recommendations
An official security update from Microsoft is available and should be applied immediately to remediate this vulnerability. Refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45657 for the patch and update instructions.
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
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-45657) involves a use-after-free condition in the Windows Kernel on Windows 11 version 23H2 (build 10.0.22631.0). Exploitation allows remote code execution by an unauthenticated attacker over the network, impacting confidentiality, integrity, and availability with a CVSS 3.1 base score of 9.8 (critical). Microsoft has released an official fix to remediate this vulnerability as documented in their security update guide.
Potential Impact
Successful exploitation enables an attacker to execute arbitrary code remotely on affected Windows 11 systems without requiring privileges or user interaction, potentially leading to full system compromise including complete control over the affected device.
Mitigation Recommendations
An official security update from Microsoft is available and should be applied immediately to remediate this vulnerability. Refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45657 for the patch and update instructions.
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: 07/29/2026, 22:03:32 UTC
Last updated: 07/31/2026, 19:30:14 UTC
Views: 218
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