---
id: pr-vllm-21465
repo: vllm-project/vllm
pr: 21465
title: '[Bug] Fix Compressed Tensor NVFP4 `cutlass_fp4_group_mm` illegal memory access'
author: yewentao256
date: '2025-07-24'
url: https://github.com/vllm-project/vllm/pull/21465
source_category: upstream-code
architectures:
- sm100
tags:
- fp4
- moe
- nvfp4
- quantization
techniques: []
hardware_features:
- fp4
- nvfp4
kernel_types:
- moe
- quantization
languages:
- cuda-cpp
captured_at: '2026-04-27'
status: merged
merge_sha: e8cb0d04950c9e0b39d00f3744806c19dff4b4bc
inclusion_reason: kernel file changes
changed_paths:
- csrc/quantization/cutlass_w8a8/moe/moe_data.cu
head_ref_oid: c2078caf514f5755805f36aa1606f7137bb57ea4
artifact_dir: evidence/pull-bundles/vllm/gh-21465
---
# [Bug] Fix Compressed Tensor NVFP4 `cutlass_fp4_group_mm` illegal memory access

- Repository: `vllm-project/vllm`
- PR: [21465](https://github.com/vllm-project/vllm/pull/21465)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `csrc/quantization/cutlass_w8a8/moe/moe_data.cu`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-21465`
