Unfortunately I just stumbled over this commit by accident since I checked the commit log of libX11. So for a reproduction we would need to contact the original reporter Sami Farin (https://bugs.freedesktop.org/show_bug.cgi?id=93186) but I do not find any valid email address from him.
** Bug watch added: freedesktop.org Bugzilla #93186 https://bugs.freedesktop.org/show_bug.cgi?id=93186 -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to libx11 in Ubuntu. https://bugs.launchpad.net/bugs/1820509 Title: Avoid use-after-free in _XimProtoSetIMValues() To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libx11/+bug/1820509/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : [email protected] Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp

