---
id: pr-vllm-27035
repo: vllm-project/vllm
pr: 27035
title: '[fix][cpu] fix prefill attention in CPU attention backend'
author: fadara01
date: '2025-10-18'
url: https://github.com/vllm-project/vllm/pull/27035
source_category: upstream-code
architectures:
- sm100
tags: []
techniques: []
hardware_features: []
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: ab4be40fc5bde2dbe76e3fb081dc3721219b5a2b
inclusion_reason: defer
changed_paths:
- vllm/engine/arg_utils.py
- vllm/v1/attention/backends/cpu_attn.py
artifact_dir: evidence/pull-bundles/vllm/gh-27035
head_ref_oid: 243b9aa882673bd0071647e516d58d699a97a6cb
---
# [fix][cpu] fix prefill attention in CPU attention backend

- Repository: `vllm-project/vllm`
- PR: [27035](https://github.com/vllm-project/vllm/pull/27035)
- Decision: `defer`
- Reason: defer

## Changed Paths

- `vllm/engine/arg_utils.py`
- `vllm/v1/attention/backends/cpu_attn.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-27035`
