========================================================================= Ubuntu Security Notice USN-3695-1 July 02, 2018 linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-oem, linux-raspi2 vulnerabilities ========================================================================= A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 18.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux: Linux kernel - linux-aws: Linux kernel for Amazon Web Services (AWS) systems - linux-azure: Linux kernel for Microsoft Azure Cloud systems - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems - linux-kvm: Linux kernel for cloud environments - linux-oem: Linux kernel for OEM processors - linux-raspi2: Linux kernel for Raspberry Pi 2 Details: Wen Xu discovered that the ext4 file system implementation in the Linux kernel did not properly initialize the crc32c checksum driver. A local attacker could use this to cause a denial of service (system crash). (CVE-2018-1094) It was discovered that the cdrom driver in the Linux kernel contained an incorrect bounds check. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-10940) Wen Xu discovered that the ext4 file system implementation in the Linux kernel did not properly validate xattr sizes. A local attacker could use this to cause a denial of service (system crash). (CVE-2018-1095) Jann Horn discovered that the 32 bit adjtimex() syscall implementation for 64 bit Linux kernels did not properly initialize memory returned to user space in some situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-11508) It was discovered that an information leak vulnerability existed in the floppy driver in the Linux kernel. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-7755) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS: linux-image-4.15.0-1010-gcp 4.15.0-1010.10 linux-image-4.15.0-1011-aws 4.15.0-1011.11 linux-image-4.15.0-1012-kvm 4.15.0-1012.12 linux-image-4.15.0-1013-raspi2 4.15.0-1013.14 linux-image-4.15.0-1014-azure 4.15.0-1014.14 linux-image-4.15.0-24-generic 4.15.0-24.26 linux-image-4.15.0-24-generic-lpae 4.15.0-24.26 linux-image-4.15.0-24-lowlatency 4.15.0-24.26 linux-image-4.15.0-24-snapdragon 4.15.0-24.26 linux-image-aws 4.15.0.1011.11 linux-image-azure 4.15.0.1014.14 linux-image-gcp 4.15.0.1010.12 linux-image-generic 4.15.0.24.26 linux-image-generic-lpae 4.15.0.24.26 linux-image-gke 4.15.0.1010.12 linux-image-kvm 4.15.0.1012.12 linux-image-lowlatency 4.15.0.24.26 linux-image-oem 4.15.0.1009.11 linux-image-raspi2 4.15.0.1013.11 linux-image-snapdragon 4.15.0.24.26 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/usn/usn-3695-1 CVE-2018-1094, CVE-2018-10940, CVE-2018-1095, CVE-2018-11508, CVE-2018-7755 Package Information: https://launchpad.net/ubuntu/+source/linux/4.15.0-24.26 https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1011.11 https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1014.14 https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1010.10 https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1012.12 https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1009.12 https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1013.14