Symantec has been attempting to sell the unit for several months according to Bloomberg, which cited unnamed sources familiar with the matter.
The company paid more than $13bn for Veritas ten years ago, but despite being cash-flow generative it reportedly has low revenue growth.
Carlyle closed its last mega buyout fund in late 2013, pulling in $13bn from more than 260 LPs.
It began fundraising in 2011 with a $10bn target.
A couple of month ago the firm closed its latest European tech fund at €656m – its largest of its type to date – to invest in Europe’s telecom, media and technology sector.