Ark. Code § 26-37-207
If the title of any person holding lands by virtue of a donation deed from the state shall, for any cause, be determined to be invalid in any action brought by or against him or her at law or in equity, then such donor, his or her heirs, successors, and assigns, shall be entitled, in addition to all other available remedies, to a lien upon the lands for the amount of the taxes, penalty, and costs for which the lands were originally forfeited and sold, plus all taxes on the lands which have subsequently been paid by the purchaser, his or her heirs, successors, and assigns, together with all taxes and improvement district assessments which may have been paid on the lands following the donation, with interest on the amount paid for the lands and on the taxes and assessments from the respective dates of payment until repaid at the rate of six percent (6%) per annum. The court rendering judgment or decree against the validity of the donation shall declare and enforce the lien.
Ark. Code § 26-37-207