In early June the Wireshark Foundation made available security updates for their popular open source network packet analyzer Wireshark (v2.0.4; the current branch and v1.12.12; an update to the previous branch).
Version 2.0.4 addresses 9x security issues within 9 security advisories (8x of which were assigned CVEs (defined) that it addresses. Meanwhile version 1.12.11 references 8x security advisories (addressing 8 issues assigned to 7x CVEs).
As per standard process Linux distributions can obtain this update using the operating systems standard package manager (if the latest version is not installed automatically using the package manager you can instead compile the source code). This forum thread and this forum thread may also be helpful to you with installing Wireshark on your Linux based system.
As always, if Wireshark is installed on a critical production system or systems that contain your critical data, please back up your data before installing this update in order to prevent data loss in the rare event that an update causes unexpected issues.