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Ubuntu Security Notice USN-4136-1
September 18, 2019

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

- Ubuntu 19.04
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

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

Software Description:
- wpa: client support for WPA and WPA2

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 19.04:
  hostapd                         2:2.6-21ubuntu3.3
  wpasupplicant                   2:2.6-21ubuntu3.3

Ubuntu 18.04 LTS:
  hostapd                         2:2.6-15ubuntu2.5
  wpasupplicant                   2:2.6-15ubuntu2.5

Ubuntu 16.04 LTS:
  hostapd                         1:2.4-0ubuntu6.6
  wpasupplicant                   2.4-0ubuntu6.6

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

References:
  https://usn.ubuntu.com/4136-1
  CVE-2019-16275

Package Information:
  https://launchpad.net/ubuntu/+source/wpa/2:2.6-21ubuntu3.3
  https://launchpad.net/ubuntu/+source/wpa/2:2.6-15ubuntu2.5
  https://launchpad.net/ubuntu/+source/wpa/2.4-0ubuntu6.6