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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-04-14

Last Modified

2026-04-23

Generated

2026-07-06

AI Q&A

2026-04-14

EPSS Evaluated

2026-07-05

NVD

CVE-2026-27907

EUVD

EUVD-2026-22445

Affected Vendors & Products

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

KEV

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.

Attack-Flow Graph

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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