Well, according to USN-3455-1, the updates are available. All One needs to do is "After a standard system update you need to reboot your computer to make all the necessary changes."
And how can one be sure that everything is ok ?
After the: sudo apt-get update && sudo apt-get upgrade
and the following reboot-
1)check your version by cat /etc/lsb-release
2)check your installation history of wpasupplicant and hostapd by-
sudo apt-get changelog wpasupplicant
sudo apt-get changelog hostapd
sudo apt-cache policy hostapd
sudo apt-cache policy wpasupplicant
(The USN details the relevant package version you wish to see at this stage).
- WPA2 has a dangerous flaw in design (and an even more dangerous bug in Linux implementations)
- USN-3455-1: wpa_supplicant and hostapd vulnerabilities
- Has Ubuntu been patched against the KRACK attack?
- Key Reinstallation Attacks: Forcing Nonce Reuse in WPA2 (the paper, in PDF format)