========================================================================== Ubuntu Security Notice USN-4041-2 June 29, 2019 linux-lts-xenial, linux-aws, linux-azure update ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 14.04 ESM Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux-aws: Linux kernel for Amazon Web Services (AWS) systems - linux-azure: Linux kernel for Microsoft Azure Cloud systems - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty Details: USN-4041-1 provided updates for the Linux kernel in Ubuntu. This update provides the corresponding updates for the Linux kernel for Ubuntu 16.04 ESM. USN-4017-2 fixed vulnerabilities in the Linux kernel. Unfortunately, the update introduced a regression that interfered with networking applications that setup very low SO_SNDBUF values. This update fixes the problem. We apologize for the inconvenience. Jonathan Looney discovered that the Linux kernel could be coerced into segmenting responses into multiple TCP segments. A remote attacker could construct an ongoing sequence of requests to cause a denial of service. (CVE-2019-11479) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 14.04 ESM: linux-image-4.15.0-1049-azure 4.15.0-1049.54~14.04.1 linux-image-4.4.0-1048-aws 4.4.0-1048.52 linux-image-4.4.0-154-generic 4.4.0-154.181~14.04.1 linux-image-4.4.0-154-generic-lpae 4.4.0-154.181~14.04.1 linux-image-4.4.0-154-lowlatency 4.4.0-154.181~14.04.1 linux-image-4.4.0-154-powerpc-e500mc 4.4.0-154.181~14.04.1 linux-image-4.4.0-154-powerpc-smp 4.4.0-154.181~14.04.1 linux-image-4.4.0-154-powerpc64-emb 4.4.0-154.181~14.04.1 linux-image-4.4.0-154-powerpc64-smp 4.4.0-154.181~14.04.1 linux-image-aws 4.4.0.1048.49 linux-image-azure 4.15.0.1049.36 linux-image-generic-lpae-lts-xenial 4.4.0.154.135 linux-image-generic-lts-xenial 4.4.0.154.135 linux-image-lowlatency-lts-xenial 4.4.0.154.135 linux-image-powerpc-e500mc-lts-xenial 4.4.0.154.135 linux-image-powerpc-smp-lts-xenial 4.4.0.154.135 linux-image-powerpc64-emb-lts-xenial 4.4.0.154.135 linux-image-powerpc64-smp-lts-xenial 4.4.0.154.135 linux-image-virtual-lts-xenial 4.4.0.154.135 After a standard system update you need to reboot your computer to make all the necessary changes. ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well. References: https://usn.ubuntu.com/4041-2 https://usn.ubuntu.com/4041-1 CVE-2019-11479, https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanic