CVE-2026-27907
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
Description
CVSS Scores
EPSS Scores
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| Percentile: |
Meta Information
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 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
AI Powered Q&A
How can this vulnerability impact me? :
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.
What immediate steps should I take to mitigate this vulnerability?
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.
Can you explain this vulnerability to me?
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.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
The provided information does not specify how this vulnerability affects compliance with common standards and regulations such as GDPR or HIPAA.