========================================================================== Ubuntu Security Notice USN-4254-1 January 28, 2020 linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 16.04 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-kvm: Linux kernel for cloud environments - linux-raspi2: Linux kernel for Raspberry Pi 2 - linux-snapdragon: Linux kernel for Snapdragon processors Details: It was discovered that the Linux kernel did not properly clear data structures on context switches for certain Intel graphics processors. A local attacker could use this to expose sensitive information. (CVE-2019-14615) It was discovered that a race condition existed in the Virtual Video Test Driver in the Linux kernel. An attacker with write access to /dev/video0 on a system with the vivid module loaded could possibly use this to gain administrative privileges. (CVE-2019-18683) It was discovered that the btrfs file system in the Linux kernel did not properly validate metadata, leading to a NULL pointer dereference. An attacker could use this to specially craft a file system image that, when mounted, could cause a denial of service (system crash). (CVE-2019-18885) It was discovered that multiple memory leaks existed in the Marvell WiFi-Ex Driver for the Linux kernel. A local attacker could possibly use this to cause a denial of service (kernel memory exhaustion). (CVE-2019-19057) It was discovered that the crypto subsystem in the Linux kernel did not properly deallocate memory in certain error conditions. A local attacker could use this to cause a denial of service (kernel memory exhaustion). (CVE-2019-19062) It was discovered that the Realtek rtlwifi USB device driver in the Linux kernel did not properly deallocate memory in certain error conditions. A local attacker could possibly use this to cause a denial of service (kernel memory exhaustion). (CVE-2019-19063) Dan Carpenter discovered that the AppleTalk networking subsystem of the Linux kernel did not properly handle certain error conditions, leading to a NULL pointer dereference. A local attacker could use this to cause a denial of service (system crash). (CVE-2019-19227) It was discovered that the KVM hypervisor implementation in the Linux kernel did not properly handle ioctl requests to get emulated CPUID features. An attacker with access to /dev/kvm could use this to cause a denial of service (system crash). (CVE-2019-19332) It was discovered that the B2C2 FlexCop USB device driver in the Linux kernel did not properly validate device metadata. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2019-15291) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 LTS: linux-image-4.4.0-1065-kvm 4.4.0-1065.72 linux-image-4.4.0-1101-aws 4.4.0-1101.112 linux-image-4.4.0-1128-raspi2 4.4.0-1128.137 linux-image-4.4.0-1132-snapdragon 4.4.0-1132.140 linux-image-4.4.0-173-generic 4.4.0-173.203 linux-image-4.4.0-173-generic-lpae 4.4.0-173.203 linux-image-4.4.0-173-lowlatency 4.4.0-173.203 linux-image-4.4.0-173-powerpc-e500mc 4.4.0-173.203 linux-image-4.4.0-173-powerpc-smp 4.4.0-173.203 linux-image-4.4.0-173-powerpc64-emb 4.4.0-173.203 linux-image-4.4.0-173-powerpc64-smp 4.4.0-173.203 linux-image-aws 4.4.0.1101.105 linux-image-generic 4.4.0.173.181 linux-image-generic-lpae 4.4.0.173.181 linux-image-kvm 4.4.0.1065.65 linux-image-lowlatency 4.4.0.173.181 linux-image-powerpc-e500mc 4.4.0.173.181 linux-image-powerpc-smp 4.4.0.173.181 linux-image-powerpc64-emb 4.4.0.173.181 linux-image-powerpc64-smp 4.4.0.173.181 linux-image-raspi2 4.4.0.1128.128 linux-image-snapdragon 4.4.0.1132.124 linux-image-virtual 4.4.0.173.181 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/4254-1 CVE-2019-14615, CVE-2019-15291, CVE-2019-18683, CVE-2019-18885, CVE-2019-19057, CVE-2019-19062, CVE-2019-19063, CVE-2019-19227, CVE-2019-19332 Package Information: https://launchpad.net/ubuntu/+source/linux/4.4.0-173.203 https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1101.112 https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1065.72 https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1128.137 https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1132.140