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:

Download

See the GitHub Release for the release assets.