See the Section 2.1 of NXP SDK 2.0-1703 documentation:
The SDK is based upon the standard Linux kernel from http://www.kernel.org, but with patches added by the Yocto Project, NXP, and other community members to support NXP SoCs. Much of the NXP-supplied Linux software is within the kernel;
NXP is one of the top 20 global kernel.org contributors.
One or more times per year NXP will upgrade to the latest long-term supported kernel version; then throughout the year, the team will accumulate changes for that kernel version. Occasionally, NXP will produce an “off cycle” SDK release that adds specific support for a new IC using patches. NXP is experienced with porting code to the latest kernels, across several product lines and architectures, when it is needed by our customer base.
Have a great day,
Pavel Chubakov
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