diff --git a/dnn/src/cuda/conv_bias/cudnn_conv_bias_activation.cpp b/dnn/src/cuda/conv_bias/cudnn_conv_bias_activation.cpp
index 7e75182c..5755a912 100644
--- a/dnn/src/cuda/conv_bias/cudnn_conv_bias_activation.cpp
+++ b/dnn/src/cuda/conv_bias/cudnn_conv_bias_activation.cpp
@@ -34,7 +34,10 @@ bool ConvBiasForwardImpl::AlgoCUDNNConvBiasActivation::is_available(
         return false;
     }
     auto&& param = args.opr->param();
-    if (param.format == param::ConvBias::Format::NCHW4_NCHW32 ||
+    //! FIXME: conv kernel of cudnn for NCHW4_NCHW tensor format causes illegal
+    //! memory access errors, so we have to disable this kernel here.
+    if (param.format == param::ConvBias::Format::NCHW4_NCHW ||
+        param.format == param::ConvBias::Format::NCHW4_NCHW32 ||
         param.format == param::ConvBias::Format::NCHW32_NCHW4)
         return false;
     if (param.format == param::ConvBias::Format::NCHW &&
diff --git a/dnn/test/cuda/conv_bias.cpp b/dnn/test/cuda/conv_bias.cpp
index 901bc371..e9f168c2 100644
--- a/dnn/test/cuda/conv_bias.cpp
+++ b/dnn/test/cuda/conv_bias.cpp
@@ -456,6 +456,9 @@ TEST_F(CUDA, CONV_BIAS_FORWARD_NCHW4) {
     checker.exec({{1, 4, 2, 2, 4}, {16, 4, 3, 3, 4}, {1, 4, 1, 1, 4}, {}, {}});
 }
 
+//! FIXME: conv kernel of cudnn for NCHW4_NCHW tensor format causes illegal
+//! memory access errors, so we have to disable this test here.
+#if 0
 TEST_F(CUDA, CONV_BIAS_FORWARD_NCHW4_NCHW) {
     require_compute_capability(6, 1);
     using namespace conv_bias;
@@ -511,6 +514,7 @@ TEST_F(CUDA, CONV_BIAS_FORWARD_NCHW4_NCHW) {
     checker.set_param(param);
     checker.exec({{1, 4, 2, 2, 4}, {16, 4, 3, 3, 4}, {1, 16, 1, 1}, {}, {}});
 }
+#endif
 
 #endif