Besides posting "an open source PlayStation 4 SDK" on GitHub, CTurt analyzed PS4's security twice and explained PS4 hacking. CTurt updated the open source PS4 SDK yesterday; he previously explained that Sony's proprietary Orbis OS is based on FREEBSD. In the past he released the PS4-playground, which included PS4 tools and experiments using the Webkit exploit for PS4 firmware version 1.76. To put that in context, Sony released version 3.0 in September. However, CTurt claimed the hack could be made to work on newer firmware versions.
Other PS4 hackers are reportedly also working on a kernel exploit, yet as Wololo pointed out, it is unlikely there might be more than proof-of-concept videos as the developers continue to tweak the exploit. Otherwise, Sony will do as it has in the past and release a new firmware version. In October 2014, developers nas and Proxima studied the PSVita Webkit exploit, applied it to the PS4, and then released the PS4 proof-of-concept. Shortly thereafter. Sony pushed out new firmware as a patch."