CVE-2026-69295 Overview
CVE-2026-69295 is an out-of-bounds read vulnerability in the Windows USB Driver. An authorized local attacker can exploit this flaw to elevate privileges on the affected system. The issue is classified under [CWE-20] (Improper Input Validation) and carries a CVSS 3.1 base score of 7.8.
Microsoft published the vulnerability through its Security Update Guide. Exploitation requires local access and low-level privileges, and no user interaction is needed. Successful exploitation impacts confidentiality, integrity, and availability of the target host.
Critical Impact
A local, authorized attacker can read out-of-bounds kernel memory via the Windows USB Driver and escalate to higher privileges, gaining full control over the affected Windows host.
Affected Products
- Windows USB Driver (per Microsoft Security Update Guide advisory)
- Windows operating system versions listed in the Microsoft advisory
- Refer to the Microsoft Security Update Guide CVE-2026-69295 for the complete list of affected builds
Discovery Timeline
- 2026-09-08 - CVE-2026-69295 published to the National Vulnerability Database (NVD)
- 2026-09-09 - Last updated in NVD database
Technical Details for CVE-2026-69295
Vulnerability Analysis
The vulnerability resides in the Windows USB Driver and stems from improper input validation when handling USB-related data structures. The driver reads memory beyond the intended buffer boundary, exposing adjacent kernel memory contents.
Because the flaw is present in a kernel-mode driver, out-of-bounds reads can leak sensitive kernel data. Attackers can chain this leakage with other primitives to bypass mitigations such as kernel address space layout randomization (KASLR) and achieve privilege escalation.
The attacker must already have local access and low privileges on the machine. No user interaction is required, which allows exploitation from any authenticated session, including services and scheduled tasks. The Exploit Prediction Scoring System (EPSS) reports a probability of 0.318% as of 2026-09-10.
Root Cause
The root cause is improper validation of input passed to the Windows USB Driver [CWE-20]. The driver does not correctly bound-check a length or index value before reading from a buffer. This produces an out-of-bounds read in kernel memory.
Attack Vector
The attack vector is local. An authenticated attacker interacts with the USB Driver through IOCTL requests or crafted USB descriptor data. The malformed input triggers the out-of-bounds read, returning kernel memory contents that support privilege escalation. Refer to the Microsoft Security Update Guide CVE-2026-69295 for vendor-specific technical details.
Detection Methods for CVE-2026-69295
Indicators of Compromise
- Unexpected loading or crashes of the Windows USB Driver (usbhub.sys, usbccgp.sys, or related components) reported in the System event log.
- Unusual IOCTL activity targeting USB device stack handles from non-administrative processes.
- New or unknown processes executing with SYSTEM privileges shortly after user-mode USB driver interactions.
Detection Strategies
- Monitor Windows Error Reporting (WER) telemetry for kernel bug checks referencing USB driver modules.
- Correlate low-privileged user activity with subsequent SYSTEM-level process creation events (Event ID 4688).
- Hunt for anomalous process access to \Device\USB* device objects using EDR file and device telemetry.
Monitoring Recommendations
- Enable kernel-mode driver telemetry and forward it to a centralized logging platform for retrospective analysis.
- Track privilege escalation patterns by baselining normal token elevation and flagging deviations.
- Review endpoint detection alerts for exploitation attempts targeting kernel drivers, with priority on unpatched hosts.
How to Mitigate CVE-2026-69295
Immediate Actions Required
- Apply the Microsoft security update referenced in the Microsoft Security Update Guide CVE-2026-69295 advisory as soon as it is available for your Windows build.
- Inventory affected Windows systems and prioritize patching on multi-user hosts, terminal servers, and shared workstations where low-privileged accounts exist.
- Restrict local logon rights and remove unnecessary interactive accounts to reduce the attacker pool that can trigger the local vector.
Patch Information
Microsoft has published the advisory in its Security Update Guide. Administrators should consult the Microsoft Security Update Guide CVE-2026-69295 entry to identify the correct cumulative update KB for each affected Windows version, then deploy through Windows Update, WSUS, or Microsoft Intune.
Workarounds
- Enforce the principle of least privilege so that standard users cannot install unapproved drivers or software that could stage exploitation.
- Apply device control policies to limit which USB devices can be connected to sensitive systems.
- Enable Hypervisor-Protected Code Integrity (HVCI) and Virtualization-Based Security (VBS) to raise the cost of kernel-level exploitation.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.