We discovered a potential issue with snaps that use the hardware-observe, network-control or network-observe interfaces in 2.27. We enabled seccomp argument filtering in 2.27. This limits what “domain” of the socket() syscall can be used by default. Most importantly the NETLINK_KOBJECT_UEVENT is no longer available by default. However for the interfaces above this protocol should be available.
We released 2.27.6 that fixes this issue. It is available in the beta channel for now and will be promoted to stable once the full QA cycle is completed.