CVE-2026-45657: CWE-416: Use After Free in Microsoft Windows 11 version 23H2
CVE-2026-45657 is a critical use-after-free vulnerability in the Windows Kernel of Microsoft Windows 11 version 23H2 (build 10. 0. 22631. 0). This flaw allows an unauthorized attacker to execute arbitrary code remotely over a network without user interaction or privileges. A patch is available from Microsoft to address this issue.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-45657) involves a use-after-free condition in the Windows Kernel of Windows 11 version 23H2 (build 10.0.22631.0). Exploitation enables remote code execution by an unauthenticated attacker over a network, with high impact on confidentiality, integrity, and availability. The CVSS v3.1 base score is 9.8, reflecting critical severity. Microsoft has released an official fix for this vulnerability, as documented in their security update guide.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary code remotely on an affected system without requiring privileges or user interaction. This can lead to full system compromise, including complete control over the affected Windows 11 device, impacting confidentiality, integrity, and availability.
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 promptly to remediate this vulnerability.
CVE-2026-45657: CWE-416: Use After Free in Microsoft Windows 11 version 23H2
Description
CVE-2026-45657 is a critical use-after-free vulnerability in the Windows Kernel of Microsoft Windows 11 version 23H2 (build 10. 0. 22631. 0). This flaw allows an unauthorized attacker to execute arbitrary code remotely over a network without user interaction or privileges. A patch is available from Microsoft to address this issue.
CVSS v3.1
Score 9.8critical
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 of Windows 11 version 23H2 (build 10.0.22631.0). Exploitation enables remote code execution by an unauthenticated attacker over a network, with high impact on confidentiality, integrity, and availability. The CVSS v3.1 base score is 9.8, reflecting critical severity. Microsoft has released an official fix for this vulnerability, as documented in their security update guide.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary code remotely on an affected system without requiring privileges or user interaction. This can lead to full system compromise, including complete control over the affected Windows 11 device, impacting confidentiality, integrity, and availability.
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 promptly 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: 6/9/2026, 5:27:08 PM
Last enriched: 6/9/2026, 6:25:48 PM
Last updated: 6/9/2026, 9:27:41 PM
Views: 4
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