CVE-2026-20794: Intel Data Center Graphics Driver Privilege Escalation

CVE-2026-20794 Overview

CVE-2026-20794 is a buffer overflow vulnerability in the Intel(R) Data Center Graphics Driver for VMware ESXi software before version 2.0.2. The flaw resides within Ring 1 device driver code and can enable local code execution. An authenticated attacker with privileged access can leverage this weakness to escalate privileges on the affected system. The vulnerability is classified under CWE-120 (Classic Buffer Overflow) and impacts confidentiality, integrity, and availability of both the vulnerable component and subsequent system resources.

Critical Impact

Successful exploitation allows local code execution within a device driver context, enabling full compromise of the ESXi host running the affected Intel graphics driver.

Affected Products

• Intel(R) Data Center Graphics Driver for VMware ESXi software
• All versions before 2.0.2
• Ring 1 device driver component

Discovery Timeline

• 2026-05-12 - CVE-2026-20794 published to NVD
• 2026-05-13 - Last updated in NVD database

Technical Details for CVE-2026-20794

Vulnerability Analysis

The vulnerability is a classic buffer overflow inside the Intel Data Center Graphics Driver for VMware ESXi. The driver fails to properly validate the size of input data before copying it into a fixed-length buffer in Ring 1 device driver memory. An attacker who already holds a privileged user role on the host can trigger the overflow through driver interfaces.

Because the affected code executes within a device driver context, successful exploitation grants the attacker the privileges of the driver itself. This bypass of normal user-level isolation enables local code execution and full system compromise. The advisory notes that the attack requires no user interaction and no special internal knowledge of the driver implementation.

The issue is tracked in Intel Security Advisory SA-01402. Although the EPSS score is currently low at 0.015%, the local code execution potential warrants prompt remediation in virtualized data center environments.

Root Cause

The root cause is missing or incorrect bounds checking when the driver processes input destined for a fixed-size buffer. The driver writes data past the allocated buffer boundary, corrupting adjacent kernel memory structures and creating conditions for arbitrary code execution.

Attack Vector

Exploitation requires local access to the ESXi host with a privileged user account. The attacker invokes a driver interface or supplies crafted input that triggers the unsafe copy operation inside the Ring 1 driver. No user interaction is required, and the attack complexity is low. No public proof-of-concept code or exploit is currently available.

No verified exploitation code is available. Refer to the Intel Security Advisory SA-01402 for vendor-supplied technical details.

Detection Methods for CVE-2026-20794

Indicators of Compromise

• Unexpected ESXi host crashes or purple screen of death (PSOD) events tied to the Intel graphics driver module
• Driver module versions older than 2.0.2 reported by ESXi inventory tooling
• Anomalous privileged process activity originating from the graphics driver context

Detection Strategies

• Inventory all ESXi hosts and identify those running the Intel Data Center Graphics Driver below version 2.0.2
• Monitor ESXi VMkernel logs (vmkernel.log) for driver faults, stack traces, or kernel exceptions referencing the Intel graphics module
• Correlate privileged account activity with driver load events and unexpected memory access errors

Monitoring Recommendations

• Forward ESXi host logs to a central SIEM for correlation against driver crash signatures and privileged session activity
• Track patch compliance status for Intel driver components across the virtualization estate
• Alert on local privilege escalation behavior on ESXi hosts, including unauthorized changes to driver binaries or VIB packages

How to Mitigate CVE-2026-20794

Immediate Actions Required

• Upgrade the Intel(R) Data Center Graphics Driver for VMware ESXi to version 2.0.2 or later on all affected hosts
• Restrict and audit accounts with privileged access to ESXi hosts, since the vulnerability requires high privileges to exploit
• Apply the guidance published in Intel Security Advisory SA-01402

Patch Information

Intel has released a fixed version of the driver. Upgrade the Intel Data Center Graphics Driver for VMware ESXi to version 2.0.2 or later. Refer to Intel Security Advisory SA-01402 for the official patch package and installation instructions.

Workarounds

• Where patching cannot be performed immediately, limit access to ESXi hosts to a minimal set of administrative accounts protected with multi-factor authentication
• Isolate management networks for ESXi hosts to reduce the risk of an attacker reaching the host with privileged credentials
• Disable or unload the affected Intel graphics driver on hosts where the hardware is not required, pending vendor patch deployment

# Verify installed Intel graphics driver version on an ESXi host
esxcli software vib list | grep -i intel

# Install the updated VIB (replace path with the version 2.0.2 or later package)
esxcli software vib update -d /vmfs/volumes/datastore1/intel-graphics-driver-2.0.2.zip