It's believed to be targeted towards the PS3 Jailbreak that surfaced earlier this year in August.
Sony struck a blow to Jailbreak users in September when it filed a lawsuit against an online retailer for selling the PS3 mod PSJailbreak and later released a security patch.
However, the creators of the original PS3 Jailbreak quickly developed a downgrade for the PlayStation 3 in October.
The downgrade allowed users to roll back the changes made by Sony, thereby making the Jailbreak usable again.
Sony's now issued its counter-attack, however, in what's increasingly becoming a game of cat and mouse.
PS3 Firmware Update
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