--- title: 'USN-4001-1: libseccomp vulnerability | Ubuntu security notices' description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/notices/USN-4001-1 --- 1. [Ubuntu Security Notices](https://ubuntu.com/security/notices) 2. USN-4001-1 --- # USN-4001-1: libseccomp vulnerability Publication date 30 May 2019 Overview libseccomp could allow unintended access to system calls. Releases [19.04](https://ubuntu.com/security/notices?release=disco) [18.10](https://ubuntu.com/security/notices?release=cosmic) [18.04 LTS](https://ubuntu.com/security/notices?release=bionic) [16.04 LTS](https://ubuntu.com/security/notices?release=xenial) --- Open side navigation ## Packages * [libseccomp](https://ubuntu.com/security/cves?package=libseccomp) - library for working with the Linux seccomp filter ## Details Jann Horn discovered that libseccomp did not correctly generate 64-bit syscall argument comparisons with arithmetic operators (LT, GT, LE, GE). An attacker could use this to bypass intended access restrictions for argument-filtered system calls. ## Update instructions This update uses a new upstream release which includes additional bug fixes. In general, a standard system update will make all the necessary changes. [Learn more about how to get the fixes.](https://ubuntu.com/security/cves/about#security) The problem can be corrected by updating your system to the following package versions: | Ubuntu Release | Package Version | | --- | --- | | 19.04 disco | [libseccomp2](https://launchpad.net/ubuntu/+source/libseccomp) –  [2.4.1-0ubuntu0.19.04.3](https://launchpad.net/ubuntu/+source/libseccomp/2.4.1-0ubuntu0.19.04.3) | | | | 18.10 cosmic | [libseccomp2](https://launchpad.net/ubuntu/+source/libseccomp) –  [2.4.1-0ubuntu0.18.10.3](https://launchpad.net/ubuntu/+source/libseccomp/2.4.1-0ubuntu0.18.10.3) | | | | 18.04 LTS bionic | [libseccomp2](https://launchpad.net/ubuntu/+source/libseccomp) –  [2.4.1-0ubuntu0.18.04.2](https://launchpad.net/ubuntu/+source/libseccomp/2.4.1-0ubuntu0.18.04.2) | | | | 16.04 LTS xenial | [libseccomp2](https://launchpad.net/ubuntu/+source/libseccomp) –  [2.4.1-0ubuntu0.16.04.2](https://launchpad.net/ubuntu/+source/libseccomp/2.4.1-0ubuntu0.16.04.2) | | | --- ### Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. [Get Ubuntu Pro](https://ubuntu.com/pro) ## References * [CVE-2019-9893](https://ubuntu.com/security/CVE-2019-9893) ## Related notices * [USN-4001-2](https://ubuntu.com/security/notices/USN-4001-2)