The source was shared in June 2015. It could have been later though, Allwinner tends to rewrite their Git history.<p>Thomas Kaiser appears to have been the first person to discover it on April 29th, 2016. <a href="http:&#x2F;&#x2F;irclog.whitequark.org&#x2F;linux-sunxi&#x2F;2016-04-29#16314390" rel="nofollow">http:&#x2F;&#x2F;irclog.whitequark.org&#x2F;linux-sunxi&#x2F;2016-04-29#16314390</a> (Thanks to HD Moore for linking me.)<p>From what I can tell, it went unnoticed for slightly under a year.