- API: `containers/{id}/attach/ws` only to streams according by `stdin`, `stdout` and `stderr` parameters on API version >= 1.42. [moby/moby#43322](https://github.com/moby/moby/pull/43322)
- Fix UDP traffic in containers not working after the container is restarted under sustained traffic. [moby/moby#43409](https://github.com/moby/moby/pull/43409)
- Add support for pulling images with custom amd64 micro-architecture feature levels as supported by the latest versions of Go, GCC, LLVM, and other compiler tools. [moby/moby#43434](https://github.com/moby/moby/pull/43434)
- Improve validation of invalid JSON requests in the API. [moby/moby#43463](https://github.com/moby/moby/pull/43463)
- Mitigate the impact of slow `exec` starts on health checks. Check timeout now only applies to the duration that the health check command is running. The time it takes to start the command no longer counts against the timeout. [moby/moby#43480](https://github.com/moby/moby/pull/43480)
- Console `tty` size is set immediately on creation. [moby/moby#43593](https://github.com/moby/moby/pull/43593), [moby/moby#43622](https://github.com/moby/moby/pull/43622)
- Fix `overlay2` mounts not being cleaned up after failed container starts, or daemon shutdown. [moby/moby#43659](https://github.com/moby/moby/pull/43659)
- Match manifest list resolution with `containerd`. [moby/moby#43675](https://github.com/moby/moby/pull/43675)
- Skip use of `firewalld` for networking when the daemon is running in rootless mode. [moby/moby#43813](https://github.com/moby/moby/pull/43813)
- Custom NAT networks are now re-created after daemon restart if missing on Windows. [moby/moby#43858](https://github.com/moby/moby/pull/43858)
- Fix terminating the container health-check process when it times out. [moby/moby#43994](https://github.com/moby/moby/pull/43994)
- Fix `live-restore` with restart policies and volume refs. [moby/moby#44237](https://github.com/moby/moby/pull/44237)
- API: Only anonymous volumes now pruned by default on API version >= v1.42. Pass the filter `all=true` to prune named volumes in addition to anonymous. [moby/moby#44259](https://github.com/moby/moby/pull/44259)
- API: Support concurrent calls on the `GET /system/df` endpoint. [moby/moby#42715](https://github.com/moby/moby/pull/42715)
- Improve the reliability of the daemon dumping the stack and exits with code 2 when sent a SIGQUIT. [moby/moby#44831](https://github.com/moby/moby/pull/44831)
- Improve the reliability of `docker logs -f` on Windows, and prevent newlines from being dropped in the `local` log driver. [moby/moby#43294](https://github.com/moby/moby/pull/43294)
- Fix a rare deadlock in the daemon caused by buffering of container logs. [moby/moby#44856](https://github.com/moby/moby/pull/44856)
- Improve error handling in misc filesystem operations so that the daemon can start on a overlayfs backing filesystem. [moby/moby#44834](https://github.com/moby/moby/pull/44834)
- Fix an issue where `--ipc=host` wasn't handled correctly when the daemon is running in rootless mode. [moby/moby#44863](https://github.com/moby/moby/pull/44863)
- Fix a long-standing set of issues where stale conntrack entries caused incorrect routing of UDP traffic for containers. [moby/moby#44752](https://github.com/moby/moby/pull/44752)
- Fix half-registered containers being listed in the API, as well as a nil pointer de-reference and panic caused by using a partially registered container in API calls. [moby/moby#44633](https://github.com/moby/moby/pull/44633)
- Fix a failure to create the `DOCKER-USER` ip6tables chain. [moby/moby#44845](https://github.com/moby/moby/pull/44845)
- Fix a failure to clean up iptables rules when the `ip6tables` command isn't available. [moby/moby#44727](https://github.com/moby/moby/pull/44727)
- Fix an issue where some iptables NAT rules weren't cleaned up after enabling the userland proxy. [moby/moby#44811](https://github.com/moby/moby/pull/44811)
- Fix a potentially leaked process in rare situations where cleaning up a failed attempt to start a container was mishandled. [moby/moby#44400](https://github.com/moby/moby/pull/44400)