# Windows Subsystem for Linux 2.9.9

- Product: Windows Subsystem for Linux (https://whatsnew.fyi/product/wsl)
- Vendor: Microsoft
- Date: 2026-08-25
- Version: 2.9.9
- Original notes: https://github.com/microsoft/WSL/releases/tag/2.9.9
- Permalink: https://whatsnew.fyi/product/wsl/releases/2.9.9
- Labels: Pre-release

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **fixed** — Fix batch of minor issues
- **changed** — Consolidate timestamp parsing and support docker-style options
- **changed** — Match docker's keyset for wslc volume list --format json
- **added** — Add hybrid CRT link for Windows binaries
- **changed** — Container lifecycle transitions
- **changed** — Update Microsoft.WSL.DeviceHost to 1.2.61
- **fixed** — Handle Linux failures from GNS callbacks

##### What's Changed
* Fix batch of minor issues by @chemwolf6922 in https://github.com/microsoft/WSL/pull/41397
* Consolidate timestamp parsing and support docker-style options by @ggarzia-MSFT in https://github.com/microsoft/WSL/pull/41403
* Localization change from build: 155641729 by @OneBlue in https://github.com/microsoft/WSL/pull/41424
* Add hybrid CRT link for Windows binaries by @JohnMcPMS in https://github.com/microsoft/WSL/pull/40890
* Match docker's keyset for wslc volume list --format json by @ggarzia-MSFT in https://github.com/microsoft/WSL/pull/41413
* Container lifecycle transitions by @kvega005 in https://github.com/microsoft/WSL/pull/41140
* Update Microsoft.WSL.DeviceHost to 1.2.61 by @OneBlue in https://github.com/microsoft/WSL/pull/41426
* Handle Linux failures from GNS callbacks by @shuaiyuanxx in https://github.com/microsoft/WSL/pull/41396
* Skip publishing helper DCAT script as artifact by @florelis in https://github.com/microsoft/WSL/pull/41431


**Full Changelog**: https://github.com/microsoft/WSL/compare/2.9.8...2.9.9