diff --git a/scripts/linux/net-tools.sh b/scripts/linux/net-tools.sh
index 2638772..444e07f 100644
--- a/scripts/linux/net-tools.sh
+++ b/scripts/linux/net-tools.sh
@@ -4,3 +4,8 @@ set -e
 if [[ "$1" == "debian12" ]] || [[ "$1" == "ubuntu24"* ]]; then
     chroot /mnt/ apt install net-tools -y
 fi
+
+# Netplan file permission fix OMI-239
+if [[ "$1" == "debian12" ]]; then
+    chmod 644 /mnt/etc/netplan/50-cloud-init.yaml
+fi
diff --git a/scripts/linux/ntp.sh b/scripts/linux/ntp.sh
index ed3abe0..93d628e 100644
--- a/scripts/linux/ntp.sh
+++ b/scripts/linux/ntp.sh
@@ -5,3 +5,8 @@ if [[ "$1" == "debian12" ]]; then
     chroot /mnt/ apt update -y
     chroot /mnt/ apt install chrony -y
 fi
+
+# make executable chronyd script fix OMI-239
+if [[ "$1" == "debian12" ]]; then
+    chmod +x /mnt/etc/dhcp/dhclient-exit-hooks.d/chrony
+fi