CVE-2025-55328: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in Microsoft Windows 11 Version 25H2
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Hyper-V allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
CVE-2025-55328 is a race condition vulnerability classified under CWE-362, affecting Microsoft Windows 11 Version 25H2 (build 10.0.26200.0), specifically within the Hyper-V virtualization component. The vulnerability stems from improper synchronization when multiple threads or processes concurrently access shared resources, leading to a race condition. This flaw allows an attacker with local, limited privileges to exploit the timing issue to elevate their privileges to higher levels, potentially SYSTEM or administrative rights. The attack does not require user interaction, making it easier to exploit once local access is obtained. The vulnerability impacts confidentiality, integrity, and availability by enabling unauthorized access and control over the system. Although no exploits are currently known in the wild, the vulnerability's presence in a widely deployed OS version and its high CVSS score (7.8) indicate a significant security risk. The absence of a patch at the time of disclosure necessitates immediate risk mitigation strategies. Hyper-V is commonly used in enterprise environments for virtualization, making this vulnerability particularly critical for organizations relying on virtual machines for critical workloads. The race condition could be exploited to bypass security boundaries within virtualized environments, potentially compromising multiple virtual machines or the host system. The vulnerability was reserved in August 2025 and published in October 2025, indicating recent discovery and disclosure.
Potential Impact
For European organizations, the impact of CVE-2025-55328 is substantial, especially for enterprises and service providers utilizing Windows 11 25H2 with Hyper-V virtualization. Successful exploitation enables local attackers to gain elevated privileges, potentially leading to full system compromise, unauthorized access to sensitive data, and disruption of critical services. This could affect data confidentiality, integrity, and availability, undermining trust and compliance with regulations such as GDPR. Organizations running virtualized workloads on Hyper-V may face risks of cross-VM attacks or host compromise, impacting cloud services, development environments, and production systems. The vulnerability could also facilitate lateral movement within networks if attackers escalate privileges on one machine and pivot to others. Given the high adoption of Windows 11 in corporate environments across Europe, the threat could affect sectors including finance, healthcare, government, and critical infrastructure. The lack of known exploits currently provides a window for proactive defense, but the vulnerability’s nature suggests that skilled attackers could develop exploits rapidly once patches are released or if details leak.
Mitigation Recommendations
1. Apply official patches from Microsoft immediately once available to address the race condition in Hyper-V. 2. Until patches are released, restrict local access to Windows 11 25H2 systems running Hyper-V by enforcing strict access controls and limiting administrative privileges. 3. Monitor logs and system behavior for unusual privilege escalation attempts or suspicious Hyper-V activity using endpoint detection and response (EDR) tools. 4. Employ application whitelisting and privilege management to reduce the attack surface for local users. 5. Isolate critical virtual machines and hosts to minimize the impact of potential compromises. 6. Conduct regular security audits and vulnerability assessments focusing on virtualization infrastructure. 7. Educate system administrators and users about the risks of local privilege escalation and the importance of applying updates promptly. 8. Consider temporarily disabling Hyper-V on systems where it is not essential to reduce exposure. 9. Implement network segmentation to limit lateral movement if a host is compromised. 10. Maintain an incident response plan tailored to virtualization-related threats.
Affected Countries
Germany, France, United Kingdom, Netherlands, Italy, Spain, Sweden
CVE-2025-55328: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in Microsoft Windows 11 Version 25H2
Description
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Hyper-V allows an authorized attacker to elevate privileges locally.
AI-Powered Analysis
Technical Analysis
CVE-2025-55328 is a race condition vulnerability classified under CWE-362, affecting Microsoft Windows 11 Version 25H2 (build 10.0.26200.0), specifically within the Hyper-V virtualization component. The vulnerability stems from improper synchronization when multiple threads or processes concurrently access shared resources, leading to a race condition. This flaw allows an attacker with local, limited privileges to exploit the timing issue to elevate their privileges to higher levels, potentially SYSTEM or administrative rights. The attack does not require user interaction, making it easier to exploit once local access is obtained. The vulnerability impacts confidentiality, integrity, and availability by enabling unauthorized access and control over the system. Although no exploits are currently known in the wild, the vulnerability's presence in a widely deployed OS version and its high CVSS score (7.8) indicate a significant security risk. The absence of a patch at the time of disclosure necessitates immediate risk mitigation strategies. Hyper-V is commonly used in enterprise environments for virtualization, making this vulnerability particularly critical for organizations relying on virtual machines for critical workloads. The race condition could be exploited to bypass security boundaries within virtualized environments, potentially compromising multiple virtual machines or the host system. The vulnerability was reserved in August 2025 and published in October 2025, indicating recent discovery and disclosure.
Potential Impact
For European organizations, the impact of CVE-2025-55328 is substantial, especially for enterprises and service providers utilizing Windows 11 25H2 with Hyper-V virtualization. Successful exploitation enables local attackers to gain elevated privileges, potentially leading to full system compromise, unauthorized access to sensitive data, and disruption of critical services. This could affect data confidentiality, integrity, and availability, undermining trust and compliance with regulations such as GDPR. Organizations running virtualized workloads on Hyper-V may face risks of cross-VM attacks or host compromise, impacting cloud services, development environments, and production systems. The vulnerability could also facilitate lateral movement within networks if attackers escalate privileges on one machine and pivot to others. Given the high adoption of Windows 11 in corporate environments across Europe, the threat could affect sectors including finance, healthcare, government, and critical infrastructure. The lack of known exploits currently provides a window for proactive defense, but the vulnerability’s nature suggests that skilled attackers could develop exploits rapidly once patches are released or if details leak.
Mitigation Recommendations
1. Apply official patches from Microsoft immediately once available to address the race condition in Hyper-V. 2. Until patches are released, restrict local access to Windows 11 25H2 systems running Hyper-V by enforcing strict access controls and limiting administrative privileges. 3. Monitor logs and system behavior for unusual privilege escalation attempts or suspicious Hyper-V activity using endpoint detection and response (EDR) tools. 4. Employ application whitelisting and privilege management to reduce the attack surface for local users. 5. Isolate critical virtual machines and hosts to minimize the impact of potential compromises. 6. Conduct regular security audits and vulnerability assessments focusing on virtualization infrastructure. 7. Educate system administrators and users about the risks of local privilege escalation and the importance of applying updates promptly. 8. Consider temporarily disabling Hyper-V on systems where it is not essential to reduce exposure. 9. Implement network segmentation to limit lateral movement if a host is compromised. 10. Maintain an incident response plan tailored to virtualization-related threats.
Affected Countries
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Technical Details
- Data Version
- 5.1
- Assigner Short Name
- microsoft
- Date Reserved
- 2025-08-12T20:19:59.424Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 68ee85843dd1bfb0b7e3ed00
Added to database: 10/14/2025, 5:16:52 PM
Last enriched: 10/14/2025, 5:32:21 PM
Last updated: 10/16/2025, 2:41:50 PM
Views: 1
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