diff --git a/kernel/microkernel/k_task.c b/kernel/microkernel/k_task.c
index fc95b6314eb..f5e968d4f1a 100644
--- a/kernel/microkernel/k_task.c
+++ b/kernel/microkernel/k_task.c
@@ -49,9 +49,17 @@ ktask_t task_id_get(void)
  * @param X Pointer to task
  * @param bits Bitmask of TF_xxx bits to reset
  * @return N/A
+ *
+ * @internal
+ * When operating on microkernel objects, this routine is invoked in the
+ * context of the microkernel server fiber. However, since microkernel tasks
+ * may pend/unpend on nanokernel objects, interrupts must be locked to
+ * prevent data corruption.
+ * @endinternal
  */
 void _k_state_bit_reset(struct k_task *X, uint32_t bits)
 {
+	unsigned int key = irq_lock();
 	uint32_t f_old = X->state;      /* old state bits */
 	uint32_t f_new = f_old & ~bits; /* new state bits */
 
@@ -73,6 +81,8 @@ void _k_state_bit_reset(struct k_task *X, uint32_t bits)
 			(1 << (X->priority & 0x1F));
 	}
 
+	irq_unlock(key);
+
 #ifdef CONFIG_TASK_MONITOR
 	f_new ^= f_old;
 	if ((_k_monitor_mask & MON_STATE) && (f_new)) {
@@ -98,9 +108,17 @@ void _k_state_bit_reset(struct k_task *X, uint32_t bits)
  * @param task_ptr Task pointer
  * @param bitmask of TF_xxx bits to set
  * @return N/A
+ *
+ * @internal
+ * When operating on microkernel objects, this routine is invoked in the
+ * context of the microkernel server fiber. However, since microkernel tasks
+ * may pend/unpend on nanokernel objects, interrupts must be locked to
+ * prevent data corruption.
+ * @endinternal
  */
 void _k_state_bit_set(struct k_task *task_ptr, uint32_t bits)
 {
+	unsigned int key = irq_lock();
 	uint32_t old_state_bits = task_ptr->state;
 	uint32_t new_state_bits = old_state_bits | bits;
 
@@ -157,6 +175,8 @@ void _k_state_bit_set(struct k_task *task_ptr, uint32_t bits)
 		}
 	}
 
+	irq_unlock(key);
+
 #ifdef CONFIG_TASK_MONITOR
 	new_state_bits ^= old_state_bits;
 	if ((_k_monitor_mask & MON_STATE) && (new_state_bits)) {