Using 2.6.5 in Ubuntu but seen for quite a number of releases.
Ex. a folder on an internal ntfs partition with 3 different file types, none of which should be executable
If files are copied over to ext.4 they maintain the x bit.
:/media/doug/media/perm$ ls -lA
-rwxrwxrwx 1 doug doug 24740306 Mar 21 2016 03.Summertime.flac
-rwxrwxrwx 1 doug doug 31408 Aug 3 18:25 Screenshot from 2017-08-03 18-24-27.png
-rwxrwxrwx 1 doug doug 12 Oct 29 20:41 see.log