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USN-4136-1: 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


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 19.04
Ubuntu 18.04
Ubuntu 16.04

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


Related notices

  • USN-4136-2: wpasupplicant-udeb, wpa, hostapd, wpasupplicant, wpagui