USN-4221-1: libpcap vulnerability

11 December 2019

libpcap vulnerability

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

  • Ubuntu 19.04
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 ESM


Applications using libpcap could be made to crash if given specially crafted data.

Software Description

  • libpcap - Library for for user-level network packet capture


It was discovered that libpcap did not properly validate PHB headers in some situations. An attacker could use this to cause a denial of service (memory exhaustion).

Update instructions

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

Ubuntu 19.04
libpcap0.8 - 1.8.1-6ubuntu1.19.04.1
Ubuntu 18.04 LTS
libpcap0.8 - 1.8.1-6ubuntu1.18.04.1
Ubuntu 16.04 LTS
libpcap0.8 - 1.7.4-2ubuntu0.1
Ubuntu 14.04 ESM
libpcap0.8 - 1.5.3-2ubuntu0.1

To update your system, please follow these instructions:

In general, a standard system update will make all the necessary changes.