---
id: pr-vllm-14396
repo: vllm-project/vllm
pr: 14396
title: '[BugFix] Illegal Memory Access in the blockwise cutlass fp8 GEMMs'
author: LucasWilkinson
date: '2025-03-07'
url: https://github.com/vllm-project/vllm/pull/14396
source_category: upstream-code
architectures:
- sm100
tags:
- fp8
- gemm
- tma
techniques: []
hardware_features:
- fp8
- tma
kernel_types:
- gemm
languages:
- cuda-cpp
captured_at: '2026-04-27'
status: merged
merge_sha: e5e03c2c1b3708640b913a0bcb9b6815f047e7fa
inclusion_reason: kernel file changes
changed_paths:
- csrc/cutlass_extensions/gemm/collective/sm90_mma_tma_gmma_ss_warpspecialized_fp8_blockwise_scaling.hpp
head_ref_oid: 74cd6c7dc000daf48bee1b9e28cd35e0bd2d5ca9
artifact_dir: evidence/pull-bundles/vllm/gh-14396
---
# [BugFix] Illegal Memory Access in the blockwise cutlass fp8 GEMMs

- Repository: `vllm-project/vllm`
- PR: [14396](https://github.com/vllm-project/vllm/pull/14396)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `csrc/cutlass_extensions/gemm/collective/sm90_mma_tma_gmma_ss_warpspecialized_fp8_blockwise_scaling.hpp`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-14396`
