The device driver,
"This particular vulnerability is caused by improper handling of 802.11 probe responses containing a long SSID field," the MKB said in its advisory.
Broadcom released a fixed driver to their partners, which provides updates for the affected products. Linksys, Zonet, and other wireless card manufactures also provide devices that ship with this driver, MKB said.
The volunteer group, Zero-day Threat Response Team (ZERT), labeled the vulnerability as "critical." computers located a short distance away from laptops are at risk as well as computers located in public spaces with an enabled wireless card in use, ZERT said.