diff --git a/io_uring/query.c b/io_uring/query.c
index 63cc30c9803d..c1704d088374 100644
--- a/io_uring/query.c
+++ b/io_uring/query.c
@@ -34,12 +34,12 @@ static ssize_t io_query_zcrx(union io_query_data *data)
 {
 	struct io_uring_query_zcrx *e = &data->zcrx;
 
-	e->register_flags = ZCRX_REG_IMPORT;
+	e->register_flags = ZCRX_SUPPORTED_REG_FLAGS;
 	e->area_flags = IORING_ZCRX_AREA_DMABUF;
 	e->nr_ctrl_opcodes = __ZCRX_CTRL_LAST;
 	e->rq_hdr_size = sizeof(struct io_uring);
 	e->rq_hdr_alignment = L1_CACHE_BYTES;
-	e->features = ZCRX_FEATURE_RX_PAGE_SIZE;
+	e->features = ZCRX_FEATURES;
 	e->__resv2 = 0;
 	return sizeof(*e);
 }
diff --git a/io_uring/zcrx.c b/io_uring/zcrx.c
index 62d693287457..73fa82759771 100644
--- a/io_uring/zcrx.c
+++ b/io_uring/zcrx.c
@@ -778,11 +778,13 @@ int io_register_zcrx_ifq(struct io_ring_ctx *ctx,
 		return -EFAULT;
 	if (!mem_is_zero(&reg.__resv, sizeof(reg.__resv)) || reg.zcrx_id)
 		return -EINVAL;
+	if (reg.flags & ~ZCRX_SUPPORTED_REG_FLAGS)
+		return -EINVAL;
 	if (reg.flags & ZCRX_REG_IMPORT)
 		return import_zcrx(ctx, arg, &reg);
 	if (copy_from_user(&rd, u64_to_user_ptr(reg.region_ptr), sizeof(rd)))
 		return -EFAULT;
-	if (reg.if_rxq == -1 || !reg.rq_entries || reg.flags)
+	if (reg.if_rxq == -1 || !reg.rq_entries)
 		return -EINVAL;
 	if (reg.rq_entries > IO_RQ_MAX_ENTRIES) {
 		if (!(ctx->flags & IORING_SETUP_CLAMP))
diff --git a/io_uring/zcrx.h b/io_uring/zcrx.h
index 32ab95b2cb81..0ddcf0ee8861 100644
--- a/io_uring/zcrx.h
+++ b/io_uring/zcrx.h
@@ -8,6 +8,9 @@
 #include <net/page_pool/types.h>
 #include <net/net_trackers.h>
 
+#define ZCRX_SUPPORTED_REG_FLAGS	(ZCRX_REG_IMPORT)
+#define ZCRX_FEATURES			(ZCRX_FEATURE_RX_PAGE_SIZE)
+
 struct io_zcrx_mem {
 	unsigned long			size;
 	bool				is_dmabuf;