sudo apt update && sudo apt upgrade

Then add the NVIDIA CUDA repository:

wget https://developer.download.nvidia.com/compute/cuda/repos/wsl-ubuntu/x86_64/cuda-wsl-ubuntu.pin
sudo mv cuda-wsl-ubuntu.pin /etc/apt/preferences.d/cuda-repository-pin-600
wget https://developer.download.nvidia.com/compute/cuda/12.5.0/local_installers/cuda-repo-wsl-ubuntu-12-5-local_12.5.0-1_amd64.deb
sudo dpkg -i cuda-repo-wsl-ubuntu-12-5-local_12.5.0-1_amd64.deb
sudo cp /var/cuda-repo-wsl-ubuntu-12-5-local/cuda-*-keyring.gpg /usr/share/keyrings/
sudo apt update
sudo apt install cuda

After that, add CUDA to your path:

echo 'export PATH=/usr/local/cuda/bin:$PATH' >> ~/.bashrc
echo 'export LD_LIBRARY_PATH=/usr/local/cuda/lib64:$LD_LIBRARY_PATH' >> ~/.bashrc
source ~/.bashrc

nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2024 NVIDIA Corporation
Built on Wed_Apr_17_19:19:55_PDT_2024
Cuda compilation tools, release 12.5, V12.5.40
Build cuda_12.5.r12.5/compiler.34177558_0
Sun Aug  3 00:06:14 2025       
+-----------------------------------------------------------------------------------------+
| NVIDIA-SMI 565.79                 Driver Version: 566.41         CUDA Version: 12.7     |
|-----------------------------------------+------------------------+----------------------+
| GPU  Name                 Persistence-M | Bus-Id          Disp.A | Volatile Uncorr. ECC |
| Fan  Temp   Perf          Pwr:Usage/Cap |           Memory-Usage | GPU-Util  Compute M. |
|                                         |                        |               MIG M. |
|=========================================+========================+======================|
|   0  NVIDIA GeForce RTX 4050 ...    On  |   00000000:01:00.0  On |                  N/A |
| N/A   46C    P8              2W /  125W |     364MiB /   6141MiB |      0%      Default |
|                                         |                        |                  N/A |
+-----------------------------------------+------------------------+----------------------+

+-----------------------------------------------------------------------------------------+
| Processes:                                                                              |
|  GPU   GI   CI        PID   Type   Process name                              GPU Memory |
|        ID   ID                                                               Usage      |
|=========================================================================================|
|  No running processes found                                                             |
+-----------------------------------------------------------------------------------------+ 

Verify Installation

nvcc --version
nvidia-smi

Compile it in WSL:

nvcc vector_add.cu -o vector_add
./vector_add