Well if you read the link to the Netgear security advisory, they stated the router fix was for a bridge mode vulnerability in routers. The routers are only vulnerable in this manner. That is where routers connect to routers, and a WPA-2 handshake occurs.Then why did some routers got the fix and some didn't even when only client are affected.
NETGEAR is aware of WPA-2 security vulnerabilities that affect NETGEAR products that connect to WiFi networks as clients.
They go on to list other devices with vulnerabilities, such as wifi adapters, wireless access points, etc. Some of these devices have firmware fixes available, many do not.Routers and gateways are only affected when in bridge mode (which is not enabled by default and not used by most customers).