receiving, by a processing device of a memory sub-system, a first request from a host system to initiate a memory access transaction, wherein the first request indicates a range of addresses associated with host data items of the memory access transaction;

allocating a region of a memory buffer residing on a volatile memory device of the memory sub-system for storage of the host data items having addresses within the range of addresses;

creating, in a metadata structure, a mapping between a transaction identifier for the memory access transaction and the range of addresses associated with the host data items of the memory access transaction;

storing each incoming host data item having an address within the range of addresses in the memory buffer residing on the volatile memory device;

identifying, based on the mapping in the metadata structure, one or more host data items that are stored at the memory buffer and associated with the transaction identifier;

migrating the one or more the host data items from the memory buffer to a persistent memory device;

updating the metadata structure to remove the mapping between the transaction identifier for the memory access transaction and the range of addresses; and

committing the memory access transaction.