I can confirm the bug here with BCM4313 on a Dell Latitude E6430 and fresh Ubuntu 12.10 install.
$ lspci -vnn 02:00.0 Network controller [0280]: Broadcom Corporation 802.11b/g/n Wireless LAN Controller [14e4:4727] (rev 01)
This workaround worked : sudo rmmod wl && sudo modprobe brcmsmac (thanks Maximilian)
I can confirm the bug here with BCM4313 on a Dell Latitude E6430 and fresh Ubuntu 12.10 install.
$ lspci -vnn
02:00.0 Network controller [0280]: Broadcom Corporation 802.11b/g/n Wireless LAN Controller [14e4:4727] (rev 01)
This workaround worked : sudo rmmod wl && sudo modprobe brcmsmac (thanks Maximilian)