diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
index c72db5a99ebd..ab531318f170 100644
--- a/drivers/vfio/platform/vfio_platform_common.c
+++ b/drivers/vfio/platform/vfio_platform_common.c
@@ -591,9 +591,13 @@ int vfio_platform_mmap(struct vfio_device *core_vdev, struct vm_area_struct *vma
 			&& (vma->vm_flags & VM_READ))
 		return -EINVAL;
 
-	if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE)
-			&& (vma->vm_flags & VM_WRITE))
-		return -EINVAL;
+	/* Prevent read-only region mappings from being upgraded with mprotect() */
+	if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE)) {
+		if (vma->vm_flags & VM_WRITE)
+			return -EINVAL;
+
+		vm_flags_clear(vma, VM_MAYWRITE);
+	}
 
 	vma->vm_private_data = vdev;