Maintainers for util-linux are util-linux packagers <util-linux@packages.debian.org>.
You may want to refer to the following individual bug pages: bsdextrautils, bsdutils, eject, fdisk, libblkid-dev, libblkid1, libfdisk-dev, libfdisk1, libmount-dev, libmount1, libsmartcols-dev, libsmartcols1, libuuid1, mount, rfkill, util-linux-extra, util-linux-locales, uuid-dev, uuid-runtime.
You might like to refer to the util-linux package page, or to the Package Tracking System.
If you find a bug not listed here, please report it.