CVE-2026-96250: Windows USB Print Driver Privilege Escalation

CVE-2026-96250 Overview

CVE-2026-96250 is a use-after-free vulnerability [CWE-416] in the Windows USB Print Driver. An authorized local attacker can exploit improper memory handling in the driver to elevate privileges on the affected system. Successful exploitation yields high impact to confidentiality, integrity, and availability within the local kernel context.

The flaw requires local access and low privileges but carries high attack complexity, limiting broad opportunistic abuse. Microsoft published the advisory in its Security Update Guide on October 13, 2026.

Critical Impact
A local authorized attacker can trigger the use-after-free condition in the Windows USB Print Driver to execute code at an elevated privilege level, enabling full compromise of the local host.

Affected Products

Microsoft Windows (USB Print Driver component)
See the Microsoft Security Update Guide for the authoritative list of affected Windows builds
Specific CPE identifiers were not published in the NVD entry at the time of writing

Discovery Timeline

2026-10-13 - CVE-2026-96250 published to NVD
2026-10-14 - Last updated in NVD database

Technical Details for CVE-2026-96250

Vulnerability Analysis

The vulnerability resides in the Windows USB Print Driver, a kernel-mode component responsible for mediating communication between user-mode print services and USB-attached printing devices. A use-after-free condition occurs when the driver references a memory object after it has been freed, allowing an attacker to influence the contents of the reused allocation.

An authorized local attacker who can interact with the USB Print Driver interfaces can race object lifetime management to trigger access to freed kernel memory. Controlled reuse of that memory enables arbitrary read/write primitives or control-flow hijack inside the kernel. The result is privilege elevation from a standard user context to SYSTEM.

The advisory classifies the attack complexity as high, reflecting the need to win a timing-sensitive race or satisfy specific allocator state before the dangling reference is dereferenced.

Root Cause

The root cause is improper object lifetime management inside the USB Print Driver. A reference to a kernel object is retained and later dereferenced after the owning code path has released or freed the allocation. This matches the behavior described by [CWE-416] Use After Free.

Attack Vector

Exploitation requires local access with low privileges and no user interaction. The attacker invokes driver interfaces exposed to user mode, typically through device I/O control requests against the USB print device stack, to drive the vulnerable code path into the use-after-free condition. Microsoft has not published exploitation details, and no public proof-of-concept is listed in the NVD references.

Technical details are maintained by Microsoft in the Security Update Guide entry for CVE-2026-96250.

Detection Methods for CVE-2026-96250

Indicators of Compromise

No public indicators of compromise are available for CVE-2026-96250 at this time.
Unexpected kernel-mode crashes or BugCheck events referencing the USB print driver stack may indicate attempted exploitation.
Creation of new SYSTEM-level processes spawned from unprivileged user sessions following USB print device interaction.

Detection Strategies

Monitor Windows kernel crash dumps and WER telemetry for recurring faults originating in USB print driver modules.
Alert on local processes that interact with print spooler or USB print device I/O control codes and subsequently obtain SYSTEM-level tokens.
Correlate low-integrity process execution with abrupt privilege transitions on hosts that have not received the October 2026 Microsoft security updates.

Monitoring Recommendations

Enable kernel-mode telemetry and token manipulation auditing (Event ID 4703) to surface anomalous privilege changes.
Track driver load events and verify integrity of USB print driver binaries against patched Microsoft hashes.
Baseline normal USB print device activity on endpoints so that unexpected driver interactions on servers or kiosks stand out.

How to Mitigate CVE-2026-96250

Immediate Actions Required

Apply the Microsoft security update for CVE-2026-96250 referenced in the Security Update Guide as soon as it is validated in your change window.
Prioritize patching on multi-user systems, jump hosts, and shared workstations where untrusted local users operate.
Restrict interactive logon and local account creation on sensitive hosts until the patch is deployed.

Patch Information

Microsoft addresses CVE-2026-96250 through the Windows security update published on October 13, 2026. Refer to the Microsoft Security Update Guide for the specific KB article, affected Windows versions, and update packages applicable to your environment.

Workarounds

Disable or restrict access to the USB Print Driver on systems that do not require USB printing, using Group Policy device installation restrictions.
Block attachment of USB printer class devices on hardened endpoints through endpoint device control policies.
Limit the number of standard users with interactive logon rights on affected hosts to reduce the local attack surface.

bash

# Example: block installation of USB printer class devices via Group Policy device class GUID
# Printer device setup class GUID: {4d36e979-e325-11ce-bfc1-08002be10318}
# Computer Configuration > Administrative Templates > System > Device Installation >
#   Device Installation Restrictions > Prevent installation of devices using drivers that match these device setup classes
#   Add: {4d36e979-e325-11ce-bfc1-08002be10318}