It's certainly possible:
"Those who, through no fault of their own, do not know the Gospel of Christ or his Church, but who nevertheless seek God with a sincere heart, and, moved by grace, try in their actions to do his will as they know it through the dictates of their conscience—those too may achieve eternal salvation.
“Although in ways known to himself God can lead those who, through no fault of their own, are ignorant of the Gospel, to that faith without which it is impossible to please him, the Church still has the obligation and also the sacred right to evangelize all men” (CCC 846-48, emphases added; footnotes omitted)."
All salvation comes by Jesus Christ and through his one Catholic Church. The Catechism of the Catholic Church elaborates on the possibility of eternal salvation for non-Catholic Christians and non-Christians.
www.catholic.com