Ronaldo also scored a 96th-minute winner against Villarreal in United's previous Champions League game to mask an otherwise unconvincing performance.
Bayern have now won three games in three without conceding a goal and have one foot in the next round with a five-point lead at the top of Group E.
Massimiliano Allegri's side have a perfect nine points from their first three matches and can secure a place in the knockout stage when they host Zenit early next month.
Malmo, the Swedish champion, has lost all three of its group games and has yet to score so far in the Champions League.
Hans Vanaken scored a consolation goal to salvage pride for the hosts in the 82nd minute and Mahrez capped City's win from close range.
Madrid, the 13-time European champion, moved up to second place in Group D on six points
Inter haven't made it out of a Champions League group since the 2011-12 season and will now believe they have a good chance of doing so this year.
The Ivory Coast forward scored four goals against Sporting Lisbon on his stunning Champions League debut last month, then also hit the target against Besiktas.
PSG's win was achieved without Neymar, sidelined by an adductor muscle injury.
Griezmann was sent off in the 52nd minute for a high foot into the face of Roberto Firmino and Liverpool made Atleti pay.
Increasing the number of World Cups would “cannibalize” existing competitions, make European Championships “obsolete” and marginalize women’s tournaments, the federations wrote in a statement.
The clubs' increasing demands were a barrier in March to completing talks between UEFA and then-leaders of the European Club Association about new formats for competitions taking effect in 2024.
Timo Werner's twin strikes along with goals from Kal Havertz and Jamal Musiala set up Germany's win.
Theo Hernandez scored the dramatic last-minute winner to complete the comeback and send world champion France through to Sunday's final.
The 2024 European Championship qualifying groups will be drawn in Frankfurt in one year, UEFA said Thursday.