diff --git a/subsys/usb/device_next/class/usbd_cdc_acm.c b/subsys/usb/device_next/class/usbd_cdc_acm.c
index b20115a60f38..0d3051af66e1 100644
--- a/subsys/usb/device_next/class/usbd_cdc_acm.c
+++ b/subsys/usb/device_next/class/usbd_cdc_acm.c
@@ -1009,6 +1009,7 @@ static void cdc_acm_poll_out(const struct device *dev, const unsigned char c)
 	struct cdc_acm_uart_data *const data = dev->data;
 	k_spinlock_key_t key;
 	uint32_t wrote;
+	int retries = 20;
 
 	while (true) {
 		key = k_spin_lock(&data->lock);
@@ -1019,7 +1020,15 @@ static void cdc_acm_poll_out(const struct device *dev, const unsigned char c)
 			break;
 		}
 
-		if (k_is_in_isr() || !data->flow_ctrl) {
+		/* Bounded wait: with an attached-but-stalled host session (macOS
+		 * ceases IN polling for minutes at a time), an unbounded sleep-retry
+		 * here makes every console write take the full stall duration. Any
+		 * thread that logs (event text loggers, assert reporting) then backs
+		 * up its own queues and cascades into a system-wide com livelock.
+		 * After ~20 ms of backpressure, treat the console as best-effort and
+		 * discard, exactly like the detached (!flow_ctrl) case below.
+		 */
+		if (k_is_in_isr() || !data->flow_ctrl || retries-- <= 0) {
 			LOG_WRN_ONCE("Ring buffer full, discard data");
 			break;
 		}