Versions mentioned in the description apply to the upstream
Remediation section below for
Ubuntu:16.04 relevant versions.
In SQLite 3.27.2, interleaving reads and writes in a single transaction with an fts5 virtual table will lead to a NULL Pointer Dereference in fts5ChunkIterate in sqlite3.c. This is related to ext/fts5/fts5_hash.c and ext/fts5/fts5_index.c.
sqlite3 to version 3.11.0-1ubuntu1.2 or higher.