========================================================================== Ubuntu Security Notice USN-4681-1 January 06, 2021 linux, linux-aws, linux-kvm, linux-lts-xenial, linux-raspi2, linux-snapdragon vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 16.04 LTS - Ubuntu 14.04 ESM 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 (V8) systems - linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty Details: Ryan Hall discovered that the Intel 700 Series Ethernet Controllers driver in the Linux kernel did not properly deallocate memory in some conditions. A local attacker could use this to cause a denial of service (kernel memory exhaustion). (CVE-2019-0148) It was discovered that the console keyboard driver in the Linux kernel contained a race condition. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2020-25656) Minh Yuan discovered that the tty driver in the Linux kernel contained race conditions when handling fonts. A local attacker could possibly use this to expose sensitive information (kernel memory). (CVE-2020-25668) Jinoh Kang discovered that the Xen event channel infrastructure in the Linux kernel contained a race condition. An attacker in guest could possibly use this to cause a denial of service (dom0 crash). (CVE-2020-27675) Minh Yuan discovered that the framebuffer console driver in the Linux kernel did not properly handle fonts in some conditions. A local attacker could use this to cause a denial of service (system crash) or possibly expose sensitive information (kernel memory). (CVE-2020-28974) It was discovered that Power 9 processors could be coerced to expose information from the L1 cache in certain situations. A local attacker could use this to expose sensitive information. (CVE-2020-4788) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 LTS: linux-image-4.4.0-1085-kvm 4.4.0-1085.94 linux-image-4.4.0-1119-aws 4.4.0-1119.133 linux-image-4.4.0-1143-raspi2 4.4.0-1143.153 linux-image-4.4.0-1147-snapdragon 4.4.0-1147.157 linux-image-4.4.0-198-generic 4.4.0-198.230 linux-image-4.4.0-198-generic-lpae 4.4.0-198.230 linux-image-4.4.0-198-lowlatency 4.4.0-198.230 linux-image-4.4.0-198-powerpc-e500mc 4.4.0-198.230 linux-image-4.4.0-198-powerpc-smp 4.4.0-198.230 linux-image-4.4.0-198-powerpc64-emb 4.4.0-198.230 linux-image-4.4.0-198-powerpc64-smp 4.4.0-198.230 linux-image-aws 4.4.0.1119.124 linux-image-generic 4.4.0.198.204 linux-image-generic-lpae 4.4.0.198.204 linux-image-kvm 4.4.0.1085.83 linux-image-lowlatency 4.4.0.198.204 linux-image-powerpc-e500mc 4.4.0.198.204 linux-image-powerpc-smp 4.4.0.198.204 linux-image-powerpc64-emb 4.4.0.198.204 linux-image-powerpc64-smp 4.4.0.198.204 linux-image-raspi2 4.4.0.1143.143 linux-image-snapdragon 4.4.0.1147.139 linux-image-virtual 4.4.0.198.204 Ubuntu 14.04 ESM: linux-image-4.4.0-1083-aws 4.4.0-1083.87 linux-image-4.4.0-198-generic 4.4.0-198.230~14.04.1 linux-image-4.4.0-198-generic-lpae 4.4.0-198.230~14.04.1 linux-image-4.4.0-198-lowlatency 4.4.0-198.230~14.04.1 linux-image-4.4.0-198-powerpc-e500mc 4.4.0-198.230~14.04.1 linux-image-4.4.0-198-powerpc-smp 4.4.0-198.230~14.04.1 linux-image-4.4.0-198-powerpc64-emb 4.4.0-198.230~14.04.1 linux-image-4.4.0-198-powerpc64-smp 4.4.0-198.230~14.04.1 linux-image-aws 4.4.0.1083.80 linux-image-generic-lpae-lts-xenial 4.4.0.198.173 linux-image-generic-lts-xenial 4.4.0.198.173 linux-image-lowlatency-lts-xenial 4.4.0.198.173 linux-image-powerpc-e500mc-lts-xenial 4.4.0.198.173 linux-image-powerpc-smp-lts-xenial 4.4.0.198.173 linux-image-powerpc64-emb-lts-xenial 4.4.0.198.173 linux-image-powerpc64-smp-lts-xenial 4.4.0.198.173 linux-image-virtual-lts-xenial 4.4.0.198.173 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/4681-1 CVE-2019-0148, CVE-2020-25656, CVE-2020-25668, CVE-2020-27675, CVE-2020-28974, CVE-2020-4788 Package Information: https://launchpad.net/ubuntu/+source/linux/4.4.0-198.230 https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1119.133 https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1085.94 https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1143.153 https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1147.157