There is also an updated 5.11 kernel.
See:
https://git.proxmox.com/?p=pve-kernel.git;a=summary
and:
http://download.proxmox.com/debian/...ernel-5.11.17-1-pve_5.11.17-1~bpo10.changelog
See:
https://git.proxmox.com/?p=pve-kernel.git;a=summary
and:
http://download.proxmox.com/debian/...ernel-5.11.17-1-pve_5.11.17-1~bpo10.changelog