CVE-2026-42991: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in Microsoft Windows 10 Version 1809
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Push Notifications allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-42991) involves a race condition (CWE-362) in the Windows Push Notifications component of Microsoft Windows 10 Version 1809 (build 10.0.17763.0). The flaw arises from improper synchronization during concurrent execution using shared resources, which can be exploited by an authorized local attacker to elevate privileges. Microsoft has published an official fix to address this issue.
Potential Impact
An authorized local attacker could exploit this race condition to gain elevated privileges on the affected system. This could lead to full compromise of confidentiality, integrity, and availability of the system as indicated by the CVSS vector (C:H/I:H/A:H). There are no known exploits in the wild at the time of publication.
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-2026-42991 to remediate this vulnerability.
CVE-2026-42991: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in Microsoft Windows 10 Version 1809
Description
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Push Notifications allows an authorized attacker to elevate privileges locally.
CVSS v3.1
Score 7.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-42991) involves a race condition (CWE-362) in the Windows Push Notifications component of Microsoft Windows 10 Version 1809 (build 10.0.17763.0). The flaw arises from improper synchronization during concurrent execution using shared resources, which can be exploited by an authorized local attacker to elevate privileges. Microsoft has published an official fix to address this issue.
Potential Impact
An authorized local attacker could exploit this race condition to gain elevated privileges on the affected system. This could lead to full compromise of confidentiality, integrity, and availability of the system as indicated by the CVSS vector (C:H/I:H/A:H). There are no known exploits in the wild at the time of publication.
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-2026-42991 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-04-30T23:43:50.746Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42991","vendor":"Microsoft"}]
Threat ID: 6a284ccb8dd33fbd85664960
Added to database: 06/09/2026, 17:26:35 UTC
Last enriched: 07/29/2026, 21:50:45 UTC
Last updated: 07/31/2026, 21:26:44 UTC
Views: 53
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