No problem, but if you are curious anyway, this is the changelog according to Phone Arena:
"If you've been very curious to know what the upcoming Security Maintenance Release (SMR) is supposed to patch, Samsung has you covered. It looks like there are no less than 66 patches coming directly from Google, whereas Samsung has found 9 vulnerabilities of its own and decided to patch them as well. One security issues in particular is detailed by Samsung, which might affect the SystemUI. According to the official changelog, a vulnerability has been reported in June, which exists due to a null pointer dereference on fimg2d driver. The September security patch should fix this issues, along with the other 8 that Samsung has found in its products."