diff --git a/include/arch/arm/cortex_m/mpu/nxp_mpu.h b/include/arch/arm/cortex_m/mpu/nxp_mpu.h
index 99206ef2d72..ed1c18bef1c 100644
--- a/include/arch/arm/cortex_m/mpu/nxp_mpu.h
+++ b/include/arch/arm/cortex_m/mpu/nxp_mpu.h
@@ -34,6 +34,15 @@
 #define BM2_SM_SHIFT	15
 #define BM3_SM_SHIFT	21
 
+#define BM4_WE_SHIFT	24
+#define BM4_RE_SHIFT	25
+
+#ifdef CONFIG_USB_KINETIS
+#define BM4_PERMISSIONS	((1 << BM4_RE_SHIFT) | (1 << BM4_WE_SHIFT))
+#else
+#define BM4_PERMISSIONS	0
+#endif
+
 /* Read Attribute */
 #define MPU_REGION_READ  ((UM_READ << BM0_UM_SHIFT) | \
 			  (UM_READ << BM1_UM_SHIFT) | \
@@ -83,13 +92,15 @@
 /* Some helper defines for common regions */
 #if defined(CONFIG_MPU_ALLOW_FLASH_WRITE)
 #define REGION_RAM_ATTR	  ((MPU_REGION_SU_RWX) | \
-			   ((UM_READ | UM_WRITE | UM_EXEC) << BM3_UM_SHIFT))
+			   ((UM_READ | UM_WRITE | UM_EXEC) << BM3_UM_SHIFT) | \
+			   (BM4_PERMISSIONS))
 
 #define REGION_FLASH_ATTR (MPU_REGION_SU_RWX)
 
 #else
 #define REGION_RAM_ATTR	  ((MPU_REGION_SU_RW) | \
-			   ((UM_READ | UM_WRITE) << BM3_UM_SHIFT))
+			   ((UM_READ | UM_WRITE) << BM3_UM_SHIFT) | \
+			   (BM4_PERMISSIONS))
 
 #define REGION_FLASH_ATTR (MPU_REGION_READ | \
 			   MPU_REGION_EXEC | \