diff --git a/src/xrt/auxiliary/vk/vk_helpers.c b/src/xrt/auxiliary/vk/vk_helpers.c
index 5a975a3b9..aa71d852a 100644
--- a/src/xrt/auxiliary/vk/vk_helpers.c
+++ b/src/xrt/auxiliary/vk/vk_helpers.c
@@ -575,7 +575,11 @@ vk_init_cmd_buffer(struct vk_bundle *vk, VkCommandBuffer *out_cmd_buffer)
 	VkCommandBufferBeginInfo begin_info = {
 	    .sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO,
 	};
+
+	os_mutex_lock(&vk->cmd_pool_mutex);
 	ret = vk->vkBeginCommandBuffer(cmd_buffer, &begin_info);
+	os_mutex_unlock(&vk->cmd_pool_mutex);
+
 	if (ret != VK_SUCCESS) {
 		VK_ERROR(vk, "vkBeginCommandBuffer: %s", vk_result_string(ret));
 		goto err_buffer;
@@ -636,7 +640,9 @@ vk_submit_cmd_buffer(struct vk_bundle *vk, VkCommandBuffer cmd_buffer)
 	};
 
 	// Finish the command buffer first.
+	os_mutex_lock(&vk->cmd_pool_mutex);
 	ret = vk->vkEndCommandBuffer(cmd_buffer);
+	os_mutex_unlock(&vk->cmd_pool_mutex);
 	if (ret != VK_SUCCESS) {
 		VK_ERROR(vk, "vkEndCommandBuffer: %s", vk_result_string(ret));
 		goto out;
@@ -650,9 +656,7 @@ vk_submit_cmd_buffer(struct vk_bundle *vk, VkCommandBuffer cmd_buffer)
 	}
 
 	// Do the actual submitting.
-	os_mutex_lock(&vk->queue_mutex);
-	ret = vk->vkQueueSubmit(vk->queue, 1, &submitInfo, fence);
-	os_mutex_unlock(&vk->queue_mutex);
+	ret = vk_locked_submit(vk, vk->queue, 1, &submitInfo, fence);
 	if (ret != VK_SUCCESS) {
 		VK_ERROR(vk, "Error: Could not submit to queue.\n");
 		goto out_fence;
@@ -1499,3 +1503,19 @@ vk_update_buffer(struct vk_bundle *vk,
 
 	return true;
 }
+
+VkResult
+vk_locked_submit(struct vk_bundle *vk,
+                 VkQueue queue,
+                 uint32_t count,
+                 const VkSubmitInfo *infos,
+                 VkFence fence)
+{
+	VkResult ret;
+	os_mutex_lock(&vk->queue_mutex);
+	os_mutex_lock(&vk->cmd_pool_mutex);
+	ret = vk->vkQueueSubmit(queue, count, infos, fence);
+	os_mutex_unlock(&vk->cmd_pool_mutex);
+	os_mutex_unlock(&vk->queue_mutex);
+	return ret;
+}
diff --git a/src/xrt/auxiliary/vk/vk_helpers.h b/src/xrt/auxiliary/vk/vk_helpers.h
index dfa30f76c..94c00856a 100644
--- a/src/xrt/auxiliary/vk/vk_helpers.h
+++ b/src/xrt/auxiliary/vk/vk_helpers.h
@@ -499,6 +499,13 @@ vk_update_buffer(struct vk_bundle *vk,
                  size_t buffer_size,
                  VkDeviceMemory memory);
 
+VkResult
+vk_locked_submit(struct vk_bundle *vk,
+                 VkQueue queue,
+                 uint32_t count,
+                 const VkSubmitInfo *infos,
+                 VkFence fence);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/xrt/compositor/client/comp_vk_client.c b/src/xrt/compositor/client/comp_vk_client.c
index 182d7a3a1..638362456 100644
--- a/src/xrt/compositor/client/comp_vk_client.c
+++ b/src/xrt/compositor/client/comp_vk_client.c
@@ -90,10 +90,8 @@ client_vk_swapchain_acquire_image(struct xrt_swapchain *xsc,
 	    .pCommandBuffers = &sc->acquire[*out_index],
 	};
 
-	os_mutex_lock(&vk->queue_mutex);
 	VkResult ret =
-	    vk->vkQueueSubmit(vk->queue, 1, &submitInfo, VK_NULL_HANDLE);
-	os_mutex_unlock(&vk->queue_mutex);
+	    vk_locked_submit(vk, vk->queue, 1, &submitInfo, VK_NULL_HANDLE);
 	if (ret != VK_SUCCESS) {
 		VK_ERROR(vk, "Could not submit to queue: %d", ret);
 		return XRT_ERROR_FAILED_TO_SUBMIT_VULKAN_COMMANDS;
@@ -125,10 +123,8 @@ client_vk_swapchain_release_image(struct xrt_swapchain *xsc, uint32_t index)
 	    .pCommandBuffers = &sc->release[index],
 	};
 
-	os_mutex_lock(&vk->queue_mutex);
 	VkResult ret =
-	    vk->vkQueueSubmit(vk->queue, 1, &submitInfo, VK_NULL_HANDLE);
-	os_mutex_unlock(&vk->queue_mutex);
+	    vk_locked_submit(vk, vk->queue, 1, &submitInfo, VK_NULL_HANDLE);
 	if (ret != VK_SUCCESS) {
 		VK_ERROR(vk, "Could not submit to queue: %d", ret);
 		return XRT_ERROR_FAILED_TO_SUBMIT_VULKAN_COMMANDS;
diff --git a/src/xrt/compositor/main/comp_layer_renderer.c b/src/xrt/compositor/main/comp_layer_renderer.c
index 519b5c185..37df99257 100644
--- a/src/xrt/compositor/main/comp_layer_renderer.c
+++ b/src/xrt/compositor/main/comp_layer_renderer.c
@@ -662,7 +662,9 @@ comp_layer_renderer_draw(struct comp_layer_renderer *self)
 	if (vk_init_cmd_buffer(vk, &cmd_buffer) != VK_SUCCESS)
 		return;
 
+	os_mutex_lock(&vk->cmd_pool_mutex);
 	_render_stereo(self, vk, cmd_buffer);
+	os_mutex_unlock(&vk->cmd_pool_mutex);
 
 	VkResult res = vk_submit_cmd_buffer(vk, cmd_buffer);
 	vk_check_error("vk_submit_cmd_buffer", res, );
diff --git a/src/xrt/compositor/main/comp_renderer.c b/src/xrt/compositor/main/comp_renderer.c
index 5289aed94..cee19ef19 100644
--- a/src/xrt/compositor/main/comp_renderer.c
+++ b/src/xrt/compositor/main/comp_renderer.c
@@ -173,10 +173,8 @@ renderer_submit_queue(struct comp_renderer *r)
 	    .pSignalSemaphores = &r->semaphores.render_complete,
 	};
 
-	os_mutex_lock(&vk->queue_mutex);
-	ret = vk->vkQueueSubmit(r->queue, 1, &comp_submit_info,
-	                        r->fences[r->current_buffer]);
-	os_mutex_unlock(&vk->queue_mutex);
+	ret = vk_locked_submit(vk, r->queue, 1, &comp_submit_info,
+	                       r->fences[r->current_buffer]);
 	if (ret != VK_SUCCESS) {
 		COMP_ERROR(r->c, "vkQueueSubmit: %s", vk_result_string(ret));
 	}