No one can attain kevala jnana
In Jainism, Kevala Jnana (omniscience or absolute knowledge) is indeed attainable. Jain teachings affirm that every soul (jiva) has the potential to achieve Kevala Jnana by removing all karmic impurities through right faith (Samyak Darshan), right knowledge (Samyak Jnana), and right conduct (Samyak Charitra).
The 24 Tirthankaras, including Lord Mahavira, are prime examples who attained Kevala Jnana and guided others on the path. Many other souls have also achieved this state throughout time. Thus, according to Jain philosophy, Kevala Jnana is not only possible but is the ultimate goal of spiritual practice.