util-linux: umount may fail to remove /etc/mtab~ lock file

mount in util-linux 2.19 and earlier does not remove the /etc/mtab lock file after a failed attempt to add a mount entry, which has unspecified impact and local attack vectors...

CVE-2011-1677

mount in util-linux 2.19 and earlier does not remove the /etc/mtab lock file after a failed attempt to add a mount entry, which has unspecified impact and local attack vectors...

UBUNTU-CVE-2011-1677

mount in util-linux 2.19 and earlier does not remove the /etc/mtab lock file after a failed attempt to add a mount entry, which has unspecified impact and local attack vectors...