NVIDIA GPU Driver Kernel Mode Layer Heap Buffer Overflow Leading to Privilege Escalation
Overview
NVIDIA released a security update addressing a critical vulnerability in the kernel mode layer of its GPU display driver for Windows and Linux. The vulnerability, designated CVE-2026-15782, is a heap-based buffer overflow that can be triggered by a specially crafted shader or ML inference payload sent to the driver. An attacker with local user access could run a malicious application (e.g., a machine learning model with malformed tensor operations) that exploits this flaw. Successful exploitation could lead to a denial of service (system crash) or, more severely, arbitrary code execution with kernel-level privileges. This would allow a local attacker to escalate privileges and gain complete control over the affected system. The issue arises from insufficient input validation in the driver's memory management unit when handling complex computational graphs. AI and ML workloads are particularly potent vectors for triggering this vulnerability due to their direct and intensive interaction with the GPU driver's low-level APIs. All systems using affected driver versions for both consumer (GeForce) and data center (Tesla, Ampere) GPUs are at risk.
Affected Systems
Testing Guide
1. **Check Driver Version (Linux):** Open a terminal and run `nvidia-smi`. Check if the displayed `Driver Version` is less than `555.43`. 2. **Check Driver Version (Windows):** Open the NVIDIA Control Panel, go to `Help` -> `System Information`. Verify that the `Driver version` is less than `555.85`. 3. If your version is lower than the patched versions, your system is vulnerable.
Mitigation Steps
1. **Update NVIDIA Drivers:** Immediately download and install the latest driver version from the official NVIDIA website or through your Linux distribution's package manager. 2. **Restrict GPU Access:** In multi-tenant environments, use containerization and cgroups to limit which users and processes can access GPU hardware directly. 3. **Monitor System Logs:** Monitor kernel logs for any signs of driver crashes or memory corruption errors, which could indicate attempted exploitation.
Patch Details
Patched in Linux driver version 555.43 and Windows driver version 555.85 and later.