On behalf of the SPDK community, I’m proud to announce the release of SPDK v25.09!

This release brings several major features and improvements:

• NVMe 1.4 support for NVMe-oF target: SPDK NVMe-oF target now supports all required NVMe 1.4 features.
• NVMe-oF NSSR support: Added NVMe Subsytem Reset to NVMe-oF target, see (nvmf documentation)[https://spdk.io/doc/nvmf.html] for more information.
• NVMe-oF optimal and preferred I/O sizes: SPDK NVMe-oF target now reports preferred write and unmap alignments, preferred write and unmap granularity, and optimal write size, for bdevs that provide this information.
• Block device optimal and preferred I/O sizes: SPDK bdev layer and the nvme bdev module now report optimal and preferred I/O sizes for write and unmap commands.
• DPDK 25.07: SPDK’s DPDK submodule was updated to the DPDK 25.07 release.
• Read-only Ceph RBD bdevs: SPDK’s bdev_rbd module now supports read-only bdevs.
• Improved NVMe driver logging: Logging in the nvme driver was significantly improved to provide more information about controllers and queue pairs.
• Improved Python code packaging: Python CLI-related code was refactored to make it easier to package SPDK’s Python code.

This release contains fix (8981ddb1) for (CVE-2025-57275)[https://www.cve.org/CVERecord?id=CVE-2025-57275].

You can view the full changelog here. Deprecation notices for users upgrading from previous releases are available here.

New Contributors

This release includes 374 commits from 61 authors, with over 48k lines of code changed.

We’d especially like to recognize our first-time contributors:

• Avri Altman
• Pravin M Bathija
• Liu Cheng
• Dor Deri
• Colin Dorsey
• Amit Engel
• Ori Evron
• Vladislav Fedyaev
• Kou Jiawei
• Jinhong Kim
• Karol Kolacinski
• Andrey Korzinev
• Fedor Kukso
• Zhipeng Li
• Brian Meagher
• Jiri Novak
• Omar Pakker
• Huang Shijie
• Ramkumar S
• Mingbao Sun
• Mariusz Tkaczyk
• Evan Webster
• Przemyslaw Wielgo
• Tomas Winkler

Many thanks to everyone for your contributions, participation, and effort!