diff --git a/src/test/validation_chainstate_tests.cpp b/src/test/validation_chainstate_tests.cpp
--- a/src/test/validation_chainstate_tests.cpp
+++ b/src/test/validation_chainstate_tests.cpp
@@ -95,7 +95,7 @@
     BOOST_REQUIRE(CreateAndActivateUTXOSnapshot(m_node, m_path_root));
 
     // Ensure our active chain is the snapshot chainstate.
-    BOOST_CHECK(chainman.IsSnapshotActive());
+    BOOST_CHECK(WITH_LOCK(::cs_main, return chainman.IsSnapshotActive()));
 
     curr_tip = BlockHash{::g_best_block};
 
diff --git a/src/test/validation_chainstatemanager_tests.cpp b/src/test/validation_chainstatemanager_tests.cpp
--- a/src/test/validation_chainstatemanager_tests.cpp
+++ b/src/test/validation_chainstatemanager_tests.cpp
@@ -46,7 +46,7 @@
     WITH_LOCK(::cs_main, c1.InitCoinsCache(1 << 23));
 
     BOOST_CHECK(!manager.IsSnapshotActive());
-    BOOST_CHECK(!manager.IsSnapshotValidated());
+    BOOST_CHECK(WITH_LOCK(::cs_main, return !manager.IsSnapshotValidated()));
     auto all = manager.GetAll();
     BOOST_CHECK_EQUAL_COLLECTIONS(all.begin(), all.end(), chainstates.begin(),
                                   chainstates.end());
@@ -82,7 +82,7 @@
     BOOST_CHECK(c2.ActivateBestChain(GetConfig(), _, nullptr));
 
     BOOST_CHECK(manager.IsSnapshotActive());
-    BOOST_CHECK(!manager.IsSnapshotValidated());
+    BOOST_CHECK(WITH_LOCK(::cs_main, return !manager.IsSnapshotValidated()));
     BOOST_CHECK_EQUAL(&c2, &manager.ActiveChainstate());
     BOOST_CHECK(&c1 != &manager.ActiveChainstate());
     auto all2 = manager.GetAll();
diff --git a/src/validation.h b/src/validation.h
--- a/src/validation.h
+++ b/src/validation.h
@@ -1089,10 +1089,10 @@
 
     //! If true, the assumed-valid chainstate has been fully validated
     //! by the background validation chainstate.
-    bool m_snapshot_validated{false};
+    bool m_snapshot_validated GUARDED_BY(::cs_main){false};
 
-    CBlockIndex *m_best_invalid;
-    CBlockIndex *m_best_parked;
+    CBlockIndex *m_best_invalid GUARDED_BY(::cs_main){nullptr};
+    CBlockIndex *m_best_parked GUARDED_BY(::cs_main){nullptr};
 
     //! Internal helper for ActivateSnapshot().
     [[nodiscard]] bool
@@ -1201,7 +1201,9 @@
     std::optional<BlockHash> SnapshotBlockhash() const;
 
     //! Is there a snapshot in use and has it been fully validated?
-    bool IsSnapshotValidated() const { return m_snapshot_validated; }
+    bool IsSnapshotValidated() const EXCLUSIVE_LOCKS_REQUIRED(::cs_main) {
+        return m_snapshot_validated;
+    }
 
     /**
      * Process an incoming block. This only returns after the best known valid