CVE-2026-21221: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in Microsoft Windows 11 Version 24H2
Concurrent execution using shared resource with improper synchronization ('race condition') in Capability Access Management Service (camsvc) allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability involves a race condition (CWE-362) in the Capability Access Management Service (camsvc) component of Windows 11 Version 24H2 (build 10.0.26100.0). Due to improper synchronization when accessing shared resources concurrently, an authorized local attacker can exploit this flaw to elevate their privileges on the affected system. The issue is recognized and addressed by Microsoft with an official patch.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate privileges, potentially gaining higher-level access and control over the affected Windows 11 system. This could lead to compromise of confidentiality, integrity, and availability of the system.
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-2026-21221 to remediate this vulnerability.
CVE-2026-21221: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in Microsoft Windows 11 Version 24H2
Description
Concurrent execution using shared resource with improper synchronization ('race condition') in Capability Access Management Service (camsvc) allows an authorized attacker to elevate privileges locally.
CVSS v3.1
Score 7.0high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a race condition (CWE-362) in the Capability Access Management Service (camsvc) component of Windows 11 Version 24H2 (build 10.0.26100.0). Due to improper synchronization when accessing shared resources concurrently, an authorized local attacker can exploit this flaw to elevate their privileges on the affected system. The issue is recognized and addressed by Microsoft with an official patch.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate privileges, potentially gaining higher-level access and control over the affected Windows 11 system. This could lead to compromise of confidentiality, integrity, and availability of the system.
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-2026-21221 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2025-12-11T21:02:05.731Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21221","vendor":"Microsoft"}]
Threat ID: 69668ae6a60475309f9ae277
Added to database: 01/13/2026, 18:11:50 UTC
Last enriched: 07/30/2026, 23:38:04 UTC
Last updated: 09/10/2026, 19:36:52 UTC
Views: 240
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