content: I went looking for the same information (also a Linux user, but I use CCleaner on an Android Phone) and all I could find was 'update to the latest version'. From Bleeping Computer:  In an email to Bleeping Computer, Avast CTO Ondrej Vlcek said that updating CCleaner to the most recent recent versions fixes any issues, as "the only malware to remove is the one embedded in the CCleaner binary itself."  It doesn't execute unless run by an administrator account, so it won't effect non-rooted Android phones.