Cloud Hypervisor v49.0 Released!
Posted November 9, 2025 by Cloud Hypervisor Team ‐ 2 min read
This release has been tracked in v49.0 group of our roadmap project.
MSHV Support Improvements
On AArch64 with MSHV, firmware boot (#7391) and graceful guest shutdown (#7354) are now supported, and CI coverage has been added (#7381).
Logging Improvements
Logs now use an improved timestamp format (#7355), emit an explicit message on graceful shutdown (#7346), and reduce noisy warnings with newer guest kernels (#7423).
Removed Default IP and Mask for virtio-net Devices
The implicit default IP (192.168.249.1) and netmask (255.255.255.0) for
virtio-net devices have been removed, as previously announced in the
deprecation notice two releases ago (#7365). Users now can create
virtio-net devices with no IP and netmask assigned.
Notable Bug Fixes
- Prevent crash on malformed vsock connect requests (#7310)
- Drop the VFIO container when no VFIO devices are active (#7364)
- Gracefully close preserved file descriptors on hot device removal (#7371)
- Fix race condition in pause–resume cycles (#7397)
- Add NetConfig offload parameters to the OpenAPI spec file (#7445)
- Fix seccomp filter violation from the http-server thread (#7454)
Contributors
Many thanks to everyone who has contributed to our release:
- Aastha Rawat aastharawat@microsoft.com
- Alyssa Ross hi@alyssa.is
- Anirudh Rayabharam anrayabh@microsoft.com
- Ariel Chenet apchenet@gmail.com
- Bo Chen bchen@crusoe.ai
- Can Zhang icloud9957@gmail.com
- Eugene Korenevsky ekorenevsky@aliyun.com
- Maximilian Güntner code@mguentner.de
- Muminul Islam muislam@microsoft.com
- Oliver Anderson oliver.anderson@cyberus-technology.de
- Philipp Schuster philipp.schuster@cyberus-technology.de
- Rob Bradford rbradford@rivosinc.com
- Ruoqing He heruoqing@iscas.ac.cn
- Wei Liu liuwe@microsoft.com
- Yi Wang foxywang@tencent.com
Download
See the GitHub Release for the release assets.