# vLLM v0.32.0 fixes Mamba2 NaN errors on sm90 hardware

> **Key takeaway:** The vLLM update resolves an issue where the Mamba2 chunk scan kernel produced NaN outputs on sm90 architecture.

**Published:** 2026-10-17T00:25:45+00:00 
**Source:** vLLM High-Throughput Serving Engine 
**Category:** ai-local-edge 
**Canonical URL:** https://fosswire.org/news/vllm-v0320-fixes-mamba2-nan-errors-on-sm90-hardware.html 

## Summary
The vLLM project has released version 0.32.0, which specifically addresses a bug in the Mamba2 chunk scan kernel. This bug caused the kernel to produce NaN (Not a Number) outputs when running on sm90 architecture. The fix ensures numerical stability for Mamba2 models on this specific hardware.

## Mamba2 kernel fix details
- Fixes **NaN** output issues in the **Mamba2 chunk scan kernel**.
- Specifically targets hardware using the **sm90** architecture.