diff --git a/drivers/misc/goldfish_pipe.c b/drivers/misc/goldfish_pipe.c
index d9003e27936..a5319dda2b1 100644
--- a/drivers/misc/goldfish_pipe.c
+++ b/drivers/misc/goldfish_pipe.c
@@ -681,7 +681,7 @@ int goldfish_pipe_register(FAR void *base, int irq)
   /* Register the pipe device */
 
   return register_driver("/dev/goldfish_pipe",
-                         &g_goldfish_pipe_fops, 0666, dev);
+                         &g_goldfish_pipe_fops, 0600, dev);
 
 out:
   kmm_free(dev);
diff --git a/drivers/misc/rpmsgblk.c b/drivers/misc/rpmsgblk.c
index a19c1d31513..c64b8917727 100644
--- a/drivers/misc/rpmsgblk.c
+++ b/drivers/misc/rpmsgblk.c
@@ -1307,7 +1307,7 @@ int rpmsgblk_register(FAR const char *remotecpu, FAR const char *remotepath,
       localpath = remotepath;
     }
 
-  ret = register_blockdriver(localpath, &dev->blk, 0750, dev);
+  ret = register_blockdriver(localpath, &dev->blk, 0600, dev);
   if (ret < 0)
     {
       ferr("ERROR: register driver failed, ret=%d\n", ret);
diff --git a/drivers/mmcsd/mmcsd_sdio.c b/drivers/mmcsd/mmcsd_sdio.c
index a767dce7fee..4f0db8cd154 100644
--- a/drivers/mmcsd/mmcsd_sdio.c
+++ b/drivers/mmcsd/mmcsd_sdio.c
@@ -4407,7 +4407,7 @@ static int mmcsd_probe(FAR struct mmcsd_state_s *priv)
                 {
                   snprintf(devname, sizeof(devname), "/dev/mmcsd%d%s",
                            priv->minor, g_partname[i]);
-                  register_blockdriver(devname, &g_bops, 0660,
+                  register_blockdriver(devname, &g_bops, 0600,
                                        &priv->part[i]);
                 }
             }
diff --git a/drivers/mtd/dhara.c b/drivers/mtd/dhara.c
index 837a50e01e1..075cac7d4ff 100644
--- a/drivers/mtd/dhara.c
+++ b/drivers/mtd/dhara.c
@@ -754,7 +754,7 @@ int dhara_initialize_by_path(FAR const char *path,
    * DHARA_MTDBLOCK device structure
    */
 
-  ret = register_blockdriver(path, &g_dhara_bops, 0660, dev);
+  ret = register_blockdriver(path, &g_dhara_bops, 0600, dev);
   if (ret < 0)
     {
       ferr("register_blockdriver failed: %d\n", ret);
diff --git a/drivers/mtd/nvblk.c b/drivers/mtd/nvblk.c
index 541cfb0297b..16e68e348e4 100644
--- a/drivers/mtd/nvblk.c
+++ b/drivers/mtd/nvblk.c
@@ -542,7 +542,7 @@ int nvblk_initialize(FAR const char *path,
    * NVBLK_MTDBLOCK device structure
    */
 
-  ret = register_blockdriver(path, &g_nvblk_bops, 0660, dev);
+  ret = register_blockdriver(path, &g_nvblk_bops, 0600, dev);
   if (ret < 0)
     {
       ferr("register_blockdriver failed: %d\n", ret);
diff --git a/drivers/pipes/pipe.c b/drivers/pipes/pipe.c
index 0dc7b14e704..7ea926d007b 100644
--- a/drivers/pipes/pipe.c
+++ b/drivers/pipes/pipe.c
@@ -149,7 +149,7 @@ static int pipe_register(size_t bufsize, int flags,
 
   /* Register the pipe device */
 
-  ret = register_pipedriver(devname, &g_pipe_fops, 0666, (FAR void *)dev);
+  ret = register_pipedriver(devname, &g_pipe_fops, 0600, (FAR void *)dev);
   if (ret != 0)
     {
       pipecommon_freedev(dev);
diff --git a/drivers/sensors/ina3221.c b/drivers/sensors/ina3221.c
index 3920ac4fe9b..5f1673a0e20 100644
--- a/drivers/sensors/ina3221.c
+++ b/drivers/sensors/ina3221.c
@@ -393,7 +393,7 @@ int ina3221_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_ina3221fops, 0666, priv);
+  ret = register_driver(devpath, &g_ina3221fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/serial/uart_hostfs.c b/drivers/serial/uart_hostfs.c
index 9d4864ce181..db949a7e915 100644
--- a/drivers/serial/uart_hostfs.c
+++ b/drivers/serial/uart_hostfs.c
@@ -131,7 +131,7 @@ static int uart_hostfs_setup(FAR struct uart_dev_s *dev)
   FAR struct uart_hostfs_priv_s *priv = dev->priv;
 
   priv->fd = host_open(CONFIG_UART_HOSTFS_DEVPATH, O_RDWR | O_NONBLOCK,
-                       0666);
+                       0600);
   return priv->fd;
 }
 
diff --git a/drivers/usbdev/usbdev_fs.c b/drivers/usbdev/usbdev_fs.c
index fdc1a890ff1..1bc886fd257 100644
--- a/drivers/usbdev/usbdev_fs.c
+++ b/drivers/usbdev/usbdev_fs.c
@@ -1244,7 +1244,7 @@ static void usbdev_fs_register_driver(FAR void *arg)
     {
       snprintf(devname, sizeof(devname), "%s/ep%d",
                devinfo->name, i);
-      ret = register_driver(devname, &g_usbdev_fs_fops, 0666, &fs->eps[i]);
+      ret = register_driver(devname, &g_usbdev_fs_fops, 0600, &fs->eps[i]);
       if (ret < 0)
         {
           uerr("Failed to register driver:%s, ret:%d\n", devname, ret);
diff --git a/drivers/video/max7456.c b/drivers/video/max7456.c
index 5e882249770..646dd6cda2c 100644
--- a/drivers/video/max7456.c
+++ b/drivers/video/max7456.c
@@ -1662,7 +1662,7 @@ int max7456_register(FAR const char *path, FAR struct mx7_config_s *config)
 
   for (n = 0; ret >= 0 && n < NODE_MAP_LEN; n++)
     {
-      ret = add_interface(path, node_map[n].path, &g_mx7_fops, 0666, dev);
+      ret = add_interface(path, node_map[n].path, &g_mx7_fops, 0600, dev);
     }
 
 #if defined(DEBUG)
@@ -1675,7 +1675,7 @@ int max7456_register(FAR const char *path, FAR struct mx7_config_s *config)
   for (n = 0; ret >= 0 && n < REG_NAME_MAP_LEN; n++)
     {
       ret = add_interface(path, reg_name_map[n].path, &g_mx7_debug_fops,
-                          0666, dev);
+                          0600, dev);
     }
 #endif
 
diff --git a/drivers/virtio/virtio-blk.c b/drivers/virtio/virtio-blk.c
index aa13e02edf8..e68728c35d6 100644
--- a/drivers/virtio/virtio-blk.c
+++ b/drivers/virtio/virtio-blk.c
@@ -596,7 +596,7 @@ static int virtio_blk_probe(FAR struct virtio_device *vdev)
   /* Register block driver */
 
   snprintf(priv->name, NAME_MAX, "/dev/virtblk%d", g_virtio_blk_idx);
-  ret = register_blockdriver(priv->name, &g_virtio_blk_bops, 0660, priv);
+  ret = register_blockdriver(priv->name, &g_virtio_blk_bops, 0600, priv);
   if (ret < 0)
     {
       vrterr("Register block driver failed, ret=%d\n", ret);