Tex. Estates Code § 403.053

(a) A claim approved as a matured secured claim under Section 403.052 remains secured by any lien or security interest against the specific property securing payment of the claim but subordinated to the payment from the property of claims having a higher classification under Section 355.102. However, the secured creditor:

(1) is not entitled to exercise any remedies in a manner that prevents the payment of the higher priority claims and allowances; and

(2) during the administration of the estate, is not entitled to exercise any contractual collection rights, including the power to foreclose, without either the prior written approval of the independent executor or court approval.

(b) Subsection (a) may not be construed to suspend or otherwise prevent a creditor with a matured secured claim from seeking judicial relief of any kind or from executing any judgment against an independent executor. Except with respect to real property, any third party acting in good faith may obtain good title with respect to an estate asset acquired through a secured creditor's extrajudicial collection rights, without regard to whether the creditor had the right to collect the asset or whether the creditor acted improperly in exercising those rights during an estate administration due to having elected matured secured status.

(c) If a claim approved or established by suit as a matured secured claim is secured by property passing to one or more devisees in accordance with Subchapter G, Chapter 255, the independent executor shall collect from the devisees the amount of the debt and pay that amount to the claimant or shall sell the property and pay out of the sale proceeds the claim and associated expenses of sale consistent with the provisions of Sections 355.153(b), (c), (d), and (e) applicable to court supervised administrations.