USN-3969-1: wpa_supplicant and hostapd vulnerability

7 May 2019

wpa vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 19.04
  • Ubuntu 18.10
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS


wpa_supplicant and hostapd could be made to crash if they received specially crafted network traffic.

Software Description

  • wpa - client support for WPA and WPA2


It was discovered that wpa_supplicant and hostapd incorrectly handled unexpected fragments when using EAP-pwd. A remote attacker could possibly use this issue to cause a denial of service.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 19.04
hostapd - 2:2.6-21ubuntu3.1
wpasupplicant - 2:2.6-21ubuntu3.1
Ubuntu 18.10
hostapd - 2:2.6-18ubuntu1.2
wpasupplicant - 2:2.6-18ubuntu1.2
Ubuntu 18.04 LTS
hostapd - 2:2.6-15ubuntu2.3
wpasupplicant - 2:2.6-15ubuntu2.3
Ubuntu 16.04 LTS
hostapd - 2.4-0ubuntu6.5
wpasupplicant - 2.4-0ubuntu6.5

To update your system, please follow these instructions:

After a standard system update you need to reboot your computer to make all the necessary changes.