pkg/report: double-free is at least as severe UAF write

Double-free is at least as severe as a UAF write because in case of UAF write, the vulnerable object is given and
you have to find the right victim object - the writable offset and size needs to match.

In case of double-free you can choose both your victim and attacker object, giving more options for a successful
exploitation (there are attacker objects which can basically write all offset and sizes).

This assumes that double-free is controlled in a way that the attacker can spray a victim object between the two
`kfree()`s.

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