CVE-2026-50294

What it actually does

This vulnerability is a local information disclosure flaw in the Windows Kernel. A local, unauthorized attacker can cause the kernel to expose sensitive system information to an unauthorized context. The primary security impact is loss of confidentiality: leaked kernel or system data may help an attacker understand memory layout, security boundaries, tokens, object metadata, or other internal state. The vulnerability does not directly provide code execution, privilege escalation, data modification, or denial of service, but disclosed information may be useful when chained with other local vulnerabilities or sandbox/container escape techniques.

Why it matters to the business

Successful exploitation could expose sensitive system-level information from affected Windows workstations and servers, increasing the likelihood that another vulnerability can be exploited successfully. The standalone business impact is typically moderate because exploitation requires local access and only discloses information, but the risk rises on shared systems, virtual desktop infrastructure, terminal servers, developer workstations, jump hosts, and servers where untrusted users or code can run. This issue affects a broad range of Windows 10, Windows 11, and Windows Server versions, so organizations may have widespread exposure. It is not currently listed in CISA KEV, is not known to be used in ransomware campaigns, has no reported exploit maturity, and has a low EPSS score, which suggests no broad public exploitation signal at this time; however, kernel information disclosures are commonly valuable as part of exploit chains.

How an attack unfolds

An attacker first obtains the ability to execute code locally on an affected Windows system, either through direct interactive access, malware already running with low privileges, a malicious local application, abuse of a scripting interface, or execution inside a restricted user context. The attacker then invokes the vulnerable Windows Kernel behavior using crafted local system calls or API interactions. If exploitation succeeds, the kernel returns or exposes sensitive system information to a context that should not be authorized to receive it. The attacker can analyze the leaked data to discover kernel memory addresses, object handles, process or token-related information, or other internal state. That information may then be used to improve the reliability of a separate local privilege escalation, sandbox escape, credential theft, or defense-evasion technique. Because the flaw is local and confidentiality-only, exploitation is most likely to appear as part of a multi-stage intrusion rather than as an externally observable network attack.

How to fix it

Apply the applicable Microsoft security updates for all affected Windows versions, including Windows 10 1607, 1809, 21H2, and 22H2; Windows 11 24H2, 25H2, and 26H1; and Windows Server 2012, 2016, 2019, 2022, and 2025. No product-specific fixed version numbers were provided in the input, so use the latest cumulative update or security-only update available from Microsoft for the affected operating system branch. Prioritize systems where untrusted users can log on locally, where arbitrary code execution by users is expected, and where sensitive workloads run. If immediate patching is not possible, reduce exposure by limiting local logon rights, restricting interactive access to servers, enforcing application control, blocking untrusted executables and scripts, hardening endpoint protection, and isolating high-value systems from general-purpose user activity. Because this is a kernel issue, configuration-only mitigations should be treated as risk reduction rather than a substitute for patching.

How to confirm the fix worked

Confirm that affected assets have installed the relevant Microsoft security update or a later cumulative update for their Windows release. Validate patch status through Windows Update, WSUS, Microsoft Configuration Manager, Intune, vulnerability management tooling, or PowerShell inventory of installed hotfixes and OS build numbers. Confirm that unsupported or out-of-date Windows branches are upgraded to supported releases where updates are available. Re-scan endpoints and servers with an authenticated vulnerability scanner after patch deployment. For high-risk systems, verify that local user access is restricted, application control policies are enforced, and endpoint detection controls are active. Because no fixed build numbers were supplied, validation should be based on Microsoft’s official advisory and update catalog entries for this vulnerability and the specific Windows release in use.

Typical attack path

1. Gain the ability to run code on an affected Windows workstation or server using phishing, malware execution, compromised credentials, abuse of remote access, or access to a shared local environment.
2. Execute a crafted local program, script, or exploit component that interacts with the vulnerable Windows Kernel functionality.
3. Trigger the information disclosure condition and capture sensitive kernel or system data returned to the unauthorized local context.
4. Parse the disclosed data to identify useful internal details such as memory layout or security-relevant object state.
5. Use the leaked information to support a follow-on exploit chain, such as local privilege escalation, sandbox escape, credential access, or evasion of kernel exploit mitigations.
6. Continue post-exploitation activity using any additional privileges or reliability gained from the chained attack.

How to detect it

There are no reliable, specific network indicators for this vulnerability because exploitation is local and involves kernel behavior rather than a remote protocol. To assess whether it was already exploited, review endpoint telemetry and Windows event logs for suspicious local code execution on affected systems before patching. Useful sources include EDR process telemetry, Sysmon events, Windows Security logs, PowerShell logs, application control logs, driver load events, and crash or reliability telemetry. Look for recently introduced unknown executables running from user-writable paths, exploit-like binaries launched by Office documents, browsers, archive tools, scripting engines, or remote management tools, and suspicious follow-on behavior such as token manipulation, process injection, credential access, creation of new local administrators, service installation, or unexpected elevated processes. Kernel information disclosure exploitation may leave no direct event log artifact, so investigations should focus on preconditions and follow-on activity. If endpoint telemetry captures system call traces, memory access anomalies, or exploit prevention events, search for local processes repeatedly interacting with kernel interfaces shortly before privilege escalation or security tool tampering. Review crash dumps or Windows Error Reporting entries for unusual kernel or user-mode crashes around the time of suspicious local activity. Because the vulnerability is not currently KEV-listed and has low EPSS with no known exploit maturity, broad opportunistic exploitation is not indicated by the provided data, but targeted chaining remains plausible.

What your security team should do

• Inventory affected Windows desktop and server versions across the environment and identify systems running Windows 10, Windows 11, or Windows Server versions listed as affected.
• Patch using the latest applicable Microsoft cumulative or security update, prioritizing servers with interactive logon exposure, shared systems, VDI, terminal servers, jump hosts, developer workstations, and high-value administrative endpoints.
• Treat the issue as chainable: review exposure alongside other local privilege escalation or remote code execution vulnerabilities that could combine with a kernel information leak.
• Restrict local and remote interactive logon rights to only users and administrators who require them, especially on servers and privileged access workstations.
• Enforce application control, script control, and endpoint protection to reduce the chance that a low-privileged attacker can run exploit tooling locally.
• Monitor for suspicious local exploit activity, unsigned binaries, abnormal process behavior, and privilege escalation attempts on systems that were exposed before patching.
• For systems that cannot be patched quickly, isolate them, limit user access, increase monitoring, and schedule expedited maintenance windows.
• Track Microsoft guidance for updated affected build information, fixed update identifiers, or any later indication of public exploitation.