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USN-4136-2: wpa_supplicant and hostapd vulnerability

18 September 2019

wpa_supplicant could be made to be disconnected and require reconnection to the network if it received a specially crafted management frame.



  • wpa - client support for WPA and WPA2
  • wpasupplicant - client support for WPA and WPA2


USN-4136-1 fixed a vulnerability in wpa_supplicant. This update provides
the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.

Original advisory details:

It was discovered that wpa_supplicant incorrectly handled certain management
frames. An 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 14.04
Ubuntu 12.04

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


Related notices

  • USN-4136-1: hostapd, wpasupplicant-udeb, wpasupplicant, wpa, wpagui