diff --git a/mdb.c b/mdb.c
index 1d0f9c14..f18e6742 100644
--- a/mdb.c
+++ b/mdb.c
@@ -1505,6 +1505,7 @@ mdb_page_malloc(MDB_txn *txn, unsigned num)
 	size_t size = env->me_psize;
 	MDB_page *np = env->me_dpages;
 	if (likely(num == 1 && np)) {
+		ASAN_UNPOISON_MEMORY_REGION(np, size);
 		VALGRIND_MEMPOOL_ALLOC(env, np, size);
 		VALGRIND_MAKE_MEM_DEFINED(&np->mp_next, sizeof(np->mp_next));
 		env->me_dpages = np->mp_next;
@@ -1583,6 +1584,7 @@ mdb_kill_page(MDB_env *env, pgno_t pgno)
 		MDB_page *mp = (MDB_page *)(env->me_map + offs);
 		memset(&mp->mp_pb, 0x6F /* 'o', 111 */, env->me_psize - shift);
 		VALGRIND_MAKE_MEM_NOACCESS(&mp->mp_pb, env->me_psize - shift);
+		ASAN_POISON_MEMORY_REGION(&mp->mp_pb, env->me_psize - shift);
 	} else {
 		struct iovec iov[1];
 		iov[0].iov_len = env->me_psize - shift;
@@ -1636,9 +1638,13 @@ mdb_page_loose(MDB_cursor *mc, MDB_page *mp)
 	}
 	if (loose) {
 		mdb_debug("loosen db %d page %zu", DDBI(mc), mp->mp_pgno);
-		if (unlikely(txn->mt_env->me_flags & MDBX_PAGEPERTURB))
+		MDB_page **link = &NEXT_LOOSE_PAGE(mp);
+		if (unlikely(txn->mt_env->me_flags & MDBX_PAGEPERTURB)) {
 			mdb_kill_page(txn->mt_env, pgno);
-		NEXT_LOOSE_PAGE(mp) = txn->mt_loose_pgs;
+			VALGRIND_MAKE_MEM_UNDEFINED(link, sizeof(MDB_page*));
+			ASAN_UNPOISON_MEMORY_REGION(link, sizeof(MDB_page*));
+		}
+		*link = txn->mt_loose_pgs;
 		txn->mt_loose_pgs = mp;
 		txn->mt_loose_count++;
 		mp->mp_flags |= P_LOOSE;
@@ -2110,6 +2116,7 @@ mdb_page_alloc(MDB_cursor *mc, int num, MDB_page **mp, int flags)
 			txn->mt_loose_pgs = NEXT_LOOSE_PAGE(np);
 			txn->mt_loose_count--;
 			mdb_debug("db %d use loose page %zu", DDBI(mc), np->mp_pgno);
+			ASAN_UNPOISON_MEMORY_REGION(np, env->me_psize);
 			*mp = np;
 			return MDB_SUCCESS;
 		}
@@ -2361,6 +2368,7 @@ done:
 		np = (MDB_page *)(env->me_map + env->me_psize * pgno);
 		/* LY: reset no-access flag from mdb_kill_page() */
 		VALGRIND_MAKE_MEM_UNDEFINED(np, env->me_psize * num);
+		ASAN_UNPOISON_MEMORY_REGION(np, env->me_psize * num);
 	} else {
 		if (unlikely(!(np = mdb_page_malloc(txn, num)))) {
 			rc = ENOMEM;
@@ -5110,6 +5118,7 @@ mdbx_env_close_ex(MDB_env *env, int dont_sync)
 
 	VALGRIND_DESTROY_MEMPOOL(env);
 	while ((dp = env->me_dpages) != NULL) {
+		ASAN_UNPOISON_MEMORY_REGION(&dp->mp_next, sizeof(dp->mp_next));
 		VALGRIND_MAKE_MEM_DEFINED(&dp->mp_next, sizeof(dp->mp_next));
 		env->me_dpages = dp->mp_next;
 		free(dp);