========================================================================= Ubuntu Security Notice USN-4031-1 June 24, 2019 linux, linux-hwe vulnerability ========================================================================= A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 19.04 - Ubuntu 18.10 - Ubuntu 18.04 LTS Summary: 64-Bit PowerPC systems could be made to expose sensitive information. Software Description: - linux: Linux kernel - linux-hwe: Linux hardware enablement (HWE) kernel Details: It was discovered that the Linux kernel did not properly separate certain memory mappings when creating new userspace processes on 64-bit Power (ppc64el) systems. A local attacker could use this to access memory contents or cause memory corruption of other processes on the system. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 19.04: linux-image-5.0.0-19-generic 5.0.0-19.20 linux-image-generic 5.0.0.19.20 linux-image-virtual 5.0.0.19.20 Ubuntu 18.10: linux-image-4.18.0-24-generic 4.18.0-24.25 linux-image-generic 4.18.0.24.25 linux-image-powerpc-e500mc 4.18.0.24.25 linux-image-powerpc-smp 4.18.0.24.25 linux-image-powerpc64-emb 4.18.0.24.25 linux-image-powerpc64-smp 4.18.0.24.25 linux-image-virtual 4.18.0.24.25 Ubuntu 18.04 LTS: linux-image-4.18.0-24-generic 4.18.0-24.25~18.04.1 linux-image-generic-hwe-18.04 4.18.0.24.74 linux-image-virtual-hwe-18.04 4.18.0.24.74 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/4031-1 CVE-2019-12817 Package Information: https://launchpad.net/ubuntu/+source/linux/5.0.0-19.20 https://launchpad.net/ubuntu/+source/linux/4.18.0-24.25 https://launchpad.net/ubuntu/+source/linux-hwe/4.18.0-24.25~18.04.1