CVE-2026-27907
Received Received - Intake
Integer Underflow in Windows Storage Spaces Enables Local Privilege Escalation

Publication date: 2026-04-14

Last updated on: 2026-04-23

Assigner: Microsoft Corporation

Description
Integer underflow (wrap or wraparound) in Windows Storage Spaces Controller allows an authorized attacker to elevate privileges locally.
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Meta Information
Published
2026-04-14
Last Modified
2026-04-23
Generated
2026-06-16
AI Q&A
2026-04-14
EPSS Evaluated
2026-06-15
NVD
CVE-2026-27907
EUVD
EUVD-2026-22445
Affected Vendors & Products
Showing 10 associated CPEs
Vendor Product Version / Range
microsoft windows_11_23h2 to 10.0.22631.6936 (exc)
microsoft windows_11_23h2 to 10.0.22631.6936 (exc)
microsoft windows_11_24h2 to 10.0.26100.8246 (exc)
microsoft windows_11_24h2 to 10.0.26100.8246 (exc)
microsoft windows_11_25h2 to 10.0.26200.8246 (exc)
microsoft windows_11_25h2 to 10.0.26200.8246 (exc)
microsoft windows_11_26h1 to 10.0.28000.1836 (exc)
microsoft windows_11_26h1 to 10.0.28000.1836 (exc)
microsoft windows_server_2022_23h2 to 10.0.25398.2274 (exc)
microsoft windows_server_2025 to 10.0.26100.32690 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-191 The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.
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Executive Summary

This vulnerability is an integer underflow (also known as wrap or wraparound) in the Windows Storage Spaces Controller.

It allows an authorized attacker to elevate their privileges locally on the affected system.

Impact Analysis

The vulnerability can allow an attacker who already has some level of access to the system to increase their privileges.

This means the attacker could gain higher-level permissions, potentially leading to full control over the affected system.

Mitigation Strategies

This vulnerability allows an authorized attacker to elevate privileges locally via an integer underflow in the Windows Storage Spaces Controller.

To mitigate this vulnerability, it is recommended to apply the security updates provided by Microsoft as soon as they become available.

Ensure that only authorized users have local access to systems running Windows Storage Spaces Controller to reduce the risk of exploitation.

Compliance Impact

The provided information does not specify how this vulnerability affects compliance with common standards and regulations such as GDPR or HIPAA.

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