---
id: pr-vllm-35210
repo: vllm-project/vllm
pr: 35210
title: '[BugFix] Fix fp4 quant kernel on CUDA 12.8'
author: LopezCastroRoberto
date: '2026-02-26'
url: https://github.com/vllm-project/vllm/pull/35210
source_category: upstream-code
architectures:
- sm100
tags:
- fp4
- kernel-fusion
- nvfp4
- quantization
techniques:
- kernel-fusion
hardware_features:
- fp4
- nvfp4
kernel_types:
- quantization
languages:
- cuda-cpp
captured_at: '2026-04-27'
status: merged
merge_sha: 86c3b5a808506e325fd7e59d86d83170fc98c93c
inclusion_reason: kernel file changes
changed_paths:
- csrc/quantization/fp4/activation_nvfp4_quant_fusion_kernels.cu
- csrc/quantization/fp4/nvfp4_quant_kernels.cu
head_ref_oid: 9157f0467aa17da0efdb16c5b348f6e23c0ede3b
artifact_dir: evidence/pull-bundles/vllm/gh-35210
---
# [BugFix] Fix fp4 quant kernel on CUDA 12.8

- Repository: `vllm-project/vllm`
- PR: [35210](https://github.com/vllm-project/vllm/pull/35210)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `csrc/quantization/fp4/activation_nvfp4_quant_fusion_kernels.cu`
- `csrc/quantization/fp4/nvfp4_quant_kernels.cu`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-35210`
