Assalaamu `alaykum Mufti Sahib.
Can a kaafir be possessed by a jinn? Are there reports from our kitaabs that mentions any kuffaar having being possessed?
Answer: Yes it is possible for them to be possessed.
Jinns like teasing vulnerable people. They avoid strong, courageous, assertive persons.
So if a non Muslim was a soft, weak person the jinn would attempt to harass them. But if they were positive and they ignored everything and got on with their lives, jinns would be frustrated and flee.