It doesn't look that bad at all.
Hard to tell if it's down to the core in that pic, but if it is you can can that filled with p-tex and it will be as good as new, well good enough to not get water into the core anyway.
It's pretty simple to fix yourself, just google how to p-tex a board. I have done similar repairs on the cheap using a six pack ring as p-tex.
Or if your not too sure about the DIY approach it will probably be like $25 give or take for a shop to do it.
If you need to ride it before you can fix it, or it's not to the core just fill it with wax.