Fixes for https://security.openstack.org/ossa/OSSA-2023-003.html were released in the past week to nova, cinder, python-os-brick, and python-glance-store. Since then there have been reports of volume detachments hanging.
We are looking into it. In the mean time, we suggest holding off on any upgrades to the package versions that include these fixes. Ubuntu package versions can be found at: https://ubuntu.com/security/CVE-2023-2088. Note that cloud archives from victoria and above also include the fixes.