CVE-2026-58532

Analyzed Analyzed - Analysis Complete

Integer Overflow in Windows Kernel Leads to Privilege Escalation

Publication date: 2026-07-14

Last updated on: 2026-07-22

Assigner: Microsoft Corporation

Description

Integer overflow or wraparound in Windows Kernel allows an authorized attacker to elevate privileges locally.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-07-14

Last Modified

2026-07-22

Generated

2026-08-04

AI Q&A

2026-07-14

EPSS Evaluated

2026-08-02

NVD

CVE-2026-58532

EUVD

EUVD-2026-44293

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_server_2016	to 10.0.14393.9339 (exc)
microsoft	windows_server_2019	to 10.0.17763.9020 (exc)
microsoft	windows_server_2022	to 10.0.20348.5386 (exc)
microsoft	windows_server_2025	to 10.0.26100.33158 (exc)
microsoft	windows_10_1607	to 10.0.14393.9339 (exc)
microsoft	windows_10_1809	to 10.0.17763.9020 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7548 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7548 (exc)
microsoft	windows_11_24h2	to 10.0.26100.8875 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2525 (exc)
microsoft	windows_11_25h2	to 10.0.26200.8875 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-190	The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

Attack-Flow Graph

Executive Summary

CVE-2026-58532 is an integer overflow or wraparound vulnerability in the Windows Kernel. This flaw allows an authorized attacker with local access to exploit the vulnerability to elevate their privileges on the affected system.

An integer overflow occurs when a calculation results in a value that exceeds the storage capacity of the data type, leading to unexpected behavior or security issues. In this case, it can be leveraged to gain higher privileges than originally intended.

Detection Guidance

This vulnerability involves an integer overflow in the Windows Kernel. Detection typically requires analyzing system logs for unusual privilege escalation events or kernel-level anomalies. Microsoft recommends applying the latest security updates to mitigate this issue. No specific public commands are provided in the available resources for direct detection.

Impact Analysis

If exploited, this vulnerability can have serious consequences for affected systems and users.

An attacker with local access could elevate their privileges to gain full control over the system.
This could allow the attacker to execute arbitrary code, install malicious software, or access sensitive data.
The attacker could also disable security mechanisms, further compromising the system's integrity and confidentiality.

The CVSS score of 7.8 (High) indicates that the vulnerability poses a significant risk, particularly in environments where local access is possible.

Compliance Impact

This vulnerability can impact compliance with several common standards and regulations, depending on the context of the affected system.

GDPR: If the system processes personal data of EU citizens, a privilege escalation vulnerability could lead to unauthorized access to sensitive information, violating GDPR's requirements for data protection and confidentiality.
HIPAA: For systems handling protected health information (PHI), this vulnerability could result in unauthorized access or disclosure of PHI, violating HIPAA's security and privacy rules.
Other standards like ISO 27001 or NIST frameworks require organizations to maintain the integrity, confidentiality, and availability of systems. This vulnerability undermines those requirements by allowing unauthorized privilege escalation.

Organizations may need to report the incident if exploitation leads to a data breach, depending on the applicable regulations.

Mitigation Strategies

Apply the security update provided by Microsoft to address CVE-2026-58532. The update can be found on the Microsoft Update Guide for this vulnerability.

Ensure all Windows systems are updated to the latest patch level as soon as possible.
Restrict local access to systems to only authorized users to reduce the risk of exploitation.
Monitor Microsoft's security advisories for any additional guidance or updates related to this vulnerability.

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