Root Volume Filled by multiple NUP.* files in /tmp directory

[M-SOC 0]

A sysadmin discovered multiple 110MB NUP.* files that contained ESET-module within the first few lines. 

This seems to be an anomalous, one-off occurrence in our environment. However, the root volume of the Linux server was completely filled due to these files. 

Can anyone confirm the purpose of these files (I'm assuming they are related to definition updates) and if there is a means to prevent the creation of a multitude of such files? 

[Marcos 5,453]

NUP*.tmp files in the temp folder are temporary and should be deleted automatically unless the update process is terminated abruptly. Feel free to delete them, they are not needed.