CVE-2015-6175: Microsoft Windows Kernel Privilege Escalation Vulnerability

CVE-2015-6175 is a privilege-escalation vulnerability in the Microsoft Windows kernel. A local user who can run a crafted application may be able to obtain higher privileges on the affected system. For IT and security teams this matters because successful local elevation often turns a limited foothold into full system control, enabling persistence, credential access, or further lateral movement. Specifics of affected builds and exact conditions must be confirmed against the vendor advisory.

How it works

The weakness is classified as CWE-264 (Permissions, Privileges, and Access Controls). In broad terms, the kernel fails to enforce proper access controls when handling certain requests from user-mode code. An attacker who already has the ability to execute code on the machine—through a standard user account, a compromised process, or malware—supplies a crafted application that triggers the flawed kernel path. If successful, the application runs with elevated privileges it should not possess. Public detail does not describe the precise kernel object or call sequence involved; defenders should treat it as a classic local privilege-escalation flaw in the Windows kernel and rely on the vendor advisory for technical depth rather than assuming particular exploit mechanics.

Am I affected? How to find it in your systems

The vulnerability affects Microsoft Windows. Kernel components are present on essentially every Windows endpoint and server, so inventory should cover workstations, member servers, domain controllers, and any virtual machines running Windows. Practical steps include:

• Querying asset-management or configuration-management databases for installed Windows editions and patch levels.
• Using built-in tools such as systeminfo, Get-HotFix, or enterprise patch-compliance reports to identify systems that have not yet received the update that addresses CVE-2015-6175.
• Confirming the exact list of vulnerable configurations against the Microsoft security advisory, because public summaries do not enumerate version numbers here.

Telemetry signs of exploitation are those typical of local privilege escalation: unexpected processes running as SYSTEM or other high-privilege accounts shortly after a low-privilege process starts, anomalous kernel-mode activity, or security-event logs showing sudden privilege changes. Because the attack requires local code execution, review endpoint-detection alerts for suspicious binaries or scripts launched by standard users. Absence of such alerts does not prove safety; patch status remains the primary indicator.

How to remediate

The required action is to apply updates per vendor instructions. Obtain and deploy the security update that Microsoft released for this CVE, following your normal change-control and testing process. After installation, verify that the update is present on every Windows host and reboot if the advisory indicates a restart is necessary for the kernel fix to take effect. Once patched, continue routine hardening for the privilege-escalation class: enforce least privilege for user accounts, restrict the ability of standard users to load arbitrary drivers or execute untrusted code, and keep endpoint-protection and application-control policies current. Re-scan or re-inventory after deployment to confirm coverage.

If you can't patch immediately

When immediate patching is not feasible, reduce the attack surface with compensating controls:

• Segment networks so that hosts still missing the update have limited reach to high-value assets.
• Apply application whitelisting or software-restriction policies that prevent untrusted or non-admin users from launching arbitrary executables.
• Use endpoint-detection-and-response rules to alert on privilege-elevation patterns and on processes that attempt to interact with sensitive kernel interfaces.
• Temporarily disable or tightly control any non-essential local administrative tools or developer features that could be abused to run crafted code.
• If a host-based or network virtual-patching capability is available, enable signatures that target known privilege-escalation behaviors for this class of kernel flaw, understanding that such measures are temporary.

Monitor closely and schedule the official update as soon as operational constraints allow; compensating controls do not replace the vendor fix.

If your data may have been exposed

Actively exploited privilege-escalation vulnerabilities can be a stepping stone to broader compromise and data exposure. Known ransomware use of this specific CVE is not documented, yet any successful elevation warrants a full incident-response review of the affected host and connected systems. As a quick additional check, you can run a free exposure scan of your email addresses against known breach data sets to see whether credentials or personal information have already appeared in public breach corpora.