I'm sorry, my previous comment seems to be untrue.
I have just found that aptitude will happily upgrade everything else the latest version, if I hold just these five packages at the versions listed:
libwayland-egl1-mesa:amd64 11.2.0-1ubuntu2
libegl1-mesa:amd64 11.2.0-1ubuntu2
libgl1-mesa-dri:i386 11.2.0-1ubuntu2
libgl1-mesa-dri:amd64 11.2.0-1ubuntu2
mesa-vdpau-drivers:amd64 11.2.0-1ubuntu2
So it is in fact possible to have just these five packages downgraded while waiting for a fix.
I'm sorry, my previous comment seems to be untrue.
I have just found that aptitude will happily upgrade everything else the latest version, if I hold just these five packages at the versions listed: egl1-mesa: amd64 11.2.0-1ubuntu2 mesa-dri: i386 11.2.0-1ubuntu2 mesa-dri: amd64 11.2.0-1ubuntu2 drivers: amd64 11.2.0-1ubuntu2
libwayland-
libegl1-mesa:amd64 11.2.0-1ubuntu2
libgl1-
libgl1-
mesa-vdpau-
So it is in fact possible to have just these five packages downgraded while waiting for a fix.