CVE-2026-20914: Intel QuickAssist Technology DOS Vulnerability

CVE-2026-20914 Overview

CVE-2026-20914 is a null pointer dereference vulnerability [CWE-476] affecting Intel(R) QuickAssist Technology (QAT) software drivers for Windows before version 2.6.0. The flaw exists within Ring 3 user applications and allows an authenticated local user to trigger a denial of service condition. Exploitation requires local access and low attack complexity, but no user interaction or elevated privileges. The vulnerability impacts availability only, with no effect on confidentiality or integrity of the affected system.

Critical Impact

An authenticated local attacker can crash Intel QAT driver components on Windows, causing denial of service to systems relying on QuickAssist Technology for cryptographic and compression acceleration.

Affected Products

• Intel QuickAssist Technology (QAT) software drivers for Windows
• Versions prior to 2.6.0
• Windows platforms using Intel QAT acceleration

Discovery Timeline

• 2026-05-12 - CVE-2026-20914 published to NVD
• 2026-05-15 - Last updated in NVD database
• Intel published advisory Intel Security Advisory SA-01387

Technical Details for CVE-2026-20914

Vulnerability Analysis

The vulnerability is a null pointer dereference [CWE-476] within the Intel QAT software driver stack for Windows. The defect resides in Ring 3 user application components rather than in kernel-mode driver code. When a local authenticated user invokes specific driver interfaces, the affected code path dereferences a pointer without verifying it has been initialized. The resulting access violation terminates the affected process or service, removing availability of QAT acceleration features.

Intel QuickAssist Technology provides hardware acceleration for cryptographic operations and data compression. Services depending on QAT may fail or fall back to slower software paths when the driver crashes. The vulnerability does not expose memory contents or allow modification of data, limiting impact strictly to availability.

Root Cause

The root cause is missing pointer validation before dereference within Ring 3 driver components shipped before version 2.6.0. A code path returns or holds a null pointer under specific conditions, and subsequent code accesses the pointer without a null check.

Attack Vector

The attack vector is local. An unprivileged but authenticated user on the Windows host must interact with the QAT driver interfaces from user space to reach the vulnerable code path. No network access, no special internal knowledge, and no user interaction with another victim is required. The attacker gains only denial of service; no privilege escalation or data disclosure results.

No public proof-of-concept code is available for this issue. See the Intel Security Advisory SA-01387 for vendor technical details.

Detection Methods for CVE-2026-20914

Indicators of Compromise

• Repeated crashes or unexpected termination of Intel QAT driver user-space components or dependent services
• Windows Error Reporting (WER) entries referencing QAT modules with access violation exceptions
• Sudden loss of cryptographic or compression acceleration on hosts using QAT

Detection Strategies

• Inventory installed Intel QAT driver versions on Windows hosts and flag any version below 2.6.0
• Monitor Windows Event Log for Application Error events (Event ID 1000) referencing QAT driver binaries
• Correlate user-initiated process activity with QAT service failures to identify potential abuse attempts

Monitoring Recommendations

• Track service restart frequency for QAT-dependent workloads and alert on abnormal restart patterns
• Enable crash dump collection on systems running QAT to support root-cause analysis
• Audit which local users have access to systems with QAT installed and limit interactive logon where possible

How to Mitigate CVE-2026-20914

Immediate Actions Required

• Upgrade Intel QAT software drivers for Windows to version 2.6.0 or later on all affected hosts
• Identify production systems depending on QAT acceleration and prioritize them for patching
• Restrict local interactive logon on QAT-enabled hosts to trusted administrators only

Patch Information

Intel has released QAT software drivers for Windows version 2.6.0 that address this null pointer dereference. Refer to Intel Security Advisory SA-01387 for download links and full version details.

Workarounds

• Limit access to QAT driver interfaces to authorized service accounts where feasible
• Disable or uninstall the QAT driver on hosts that do not require hardware acceleration until patching is completed
• Apply principle of least privilege to reduce the population of authenticated users on affected systems

# Verify installed Intel QAT driver version on Windows (PowerShell)
Get-WmiObject Win32_PnPSignedDriver | Where-Object { $_.DeviceName -like "*QuickAssist*" } | Select-Object DeviceName, DriverVersion