[too short]

The main problem here is that device drivers are a funny mix of stuff put together by hardware and software developers, and these guys are often under the gun to produce the code that will power products that the manufacturer is often in a hurry to get to market."
...
Namely, that wireless device drivers are largely developed and written by an odd mix of hardware and software developers in an environment where time-to-market often trumps any thorough code review for potential security flaws."

Most linux drivers are written from scratch (although are some exceptions in which the manufacturer releases drivers, or linux uses emulated windows drivers, which is probably why the other article mentions linux) by hundreds of people around the world and thus don't have the problem of being thrown together at the last minute. Furthermore, due to their open source nature, they are subject to constant scrutiny and revision.

[HAL9000]

Atheros - Open Source Linux Driver Now Available for Atheros 802.11b/g and 802.11a/b/g Chipsets

I'll speculate that a common code base exists for the Windows, Linux and Mac drivers for the Atheros chipset, which allows the exploit to access all of those systems.