Firmware update - SRM 1.1.5-6542 - 2

[Babylonia]

NL RT1900ac   https://www.synology.com/nl-nl/releaseNote/RT1900ac
NL RT2600ac   https://www.synology.com/nl-nl/releaseNote/RT2600ac

EN RT1900ac   https://www.synology.com/en-us/releaseNote/RT1900ac
EN RT2600ac   https://www.synology.com/en-us/releaseNote/RT2600ac

Version: 1.1.5-6542 - 2
(2017-10-04)

    1. Fixed multiple security vulnerabilities regarding DNSmasq (CVE-2017-13704, CVE-2017-14491, CVE-2017-14495, CVE-2017-14496).
    2. Fixed multiple security vulnerabilities regarding DHCPv6 Server (CVE-2017-14492, CVE-2017-14493, CVE-2017-14494).
    3. Fixed a security vulnerabilities regarding Linux kernel (CVE-2017-1000253).
    4. Fixed an issue where the default gateway might not be updated when DHCP-PD is not supported by the ISP.