--- title: 'USN-4300-1: Linux kernel vulnerabilities | Ubuntu security notices' description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/notices/USN-4300-1 --- 1. [Ubuntu Security Notices](https://ubuntu.com/security/notices) 2. USN-4300-1 --- # USN-4300-1: Linux kernel vulnerabilities Publication date 25 March 2020 Overview Several security issues were fixed in the Linux kernel. Releases [19.10](https://ubuntu.com/security/notices?release=eoan) [18.04 LTS](https://ubuntu.com/security/notices?release=bionic) --- Open side navigation ## Packages * [linux](https://ubuntu.com/security/cves?package=linux) - Linux kernel * [linux-aws](https://ubuntu.com/security/cves?package=linux-aws) - Linux kernel for Amazon Web Services (AWS) systems * [linux-azure](https://ubuntu.com/security/cves?package=linux-azure) - Linux kernel for Microsoft Azure Cloud systems * [linux-azure-5.3](https://ubuntu.com/security/cves?package=linux-azure-5.3) - Linux kernel for Microsoft Azure Cloud systems * [linux-gcp](https://ubuntu.com/security/cves?package=linux-gcp) - Linux kernel for Google Cloud Platform (GCP) systems * [linux-gcp-5.3](https://ubuntu.com/security/cves?package=linux-gcp-5.3) - Linux kernel for Google Cloud Platform (GCP) systems * [linux-gke-5.3](https://ubuntu.com/security/cves?package=linux-gke-5.3) - Linux kernel for Google Container Engine (GKE) systems * [linux-hwe](https://ubuntu.com/security/cves?package=linux-hwe) - Linux hardware enablement (HWE) kernel * [linux-kvm](https://ubuntu.com/security/cves?package=linux-kvm) - Linux kernel for cloud environments * [linux-oracle](https://ubuntu.com/security/cves?package=linux-oracle) - Linux kernel for Oracle Cloud systems * [linux-raspi2](https://ubuntu.com/security/cves?package=linux-raspi2) - Linux kernel for Raspberry Pi 2 * [linux-raspi2-5.3](https://ubuntu.com/security/cves?package=linux-raspi2-5.3) - Linux kernel for Raspberry Pi 2 ## Details It was discovered that the KVM implementation in the Linux kernel, when paravirtual TLB flushes are enabled in guests, the hypervisor in some situations could miss deferred TLB flushes or otherwise mishandle them. An attacker in a guest VM could use this to expose sensitive information (read memory from another guest VM). ([CVE-2019-3016](https://ubuntu.com/security/CVE-2019-3016)) Paulo Bonzini discovered that the KVM hypervisor implementation in the Linux kernel could improperly let a nested (level 2) guest access the resources of a parent (level 1) guest in certain situations. An attacker could use this to expose sensitive information. ([CVE-2020-2732](https://ubuntu.com/security/CVE-2020-2732)) It was discovered that the Afatech AF9005 DVB-T 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... --- Show more ## Update instructions After a standard system update you need to reboot your computer to make all the necessary changes. [Learn more about how to get the fixes.](https://ubuntu.com/security/cves/about#security) 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. The problem can be corrected by updating your system to the following package versions: | Ubuntu Release | Package Version | | --- | --- | | 19.10 eoan | [linux-image-5.3.0-1011-oracle](https://launchpad.net/ubuntu/+source/linux-oracle) –  [5.3.0-1011.12](https://launchpad.net/ubuntu/+source/linux-oracle/5.3.0-1011.12) | | | | [linux-image-5.3.0-1012-kvm](https://launchpad.net/ubuntu/+source/linux-kvm) –  [5.3.0-1012.13](https://launchpad.net/ubuntu/+source/linux-kvm/5.3.0-1012.13) | | | | [linux-image-5.3.0-1013-aws](https://launchpad.net/ubuntu/+source/linux-aws) –  [5.3.0-1013.14](https://launchpad.net/ubuntu/+source/linux-aws/5.3.0-1013.14) | | | | [linux-image-5.3.0-1014-gcp](https://launchpad.net/ubuntu/+source/linux-gcp) –  [5.3.0-1014.15](https://launchpad.net/ubuntu/+source/linux-gcp/5.3.0-1014.15) | | | | [linux-image-5.3.0-1016-azure](https://launchpad.net/ubuntu/+source/linux-azure) –  [5.3.0-1016.17](https://launchpad.net/ubuntu/+source/linux-azure/5.3.0-1016.17) | | | | [linux-image-5.3.0-1019-raspi2](https://launchpad.net/ubuntu/+source/linux-raspi2) –  [5.3.0-1019.21](https://launchpad.net/ubuntu/+source/linux-raspi2/5.3.0-1019.21) | | | | [linux-image-5.3.0-42-generic](https://launchpad.net/ubuntu/+source/linux) –  [5.3.0-42.34](https://launchpad.net/ubuntu/+source/linux/5.3.0-42.34) | | | | [linux-image-5.3.0-42-generic-lpae](https://launchpad.net/ubuntu/+source/linux) –  [5.3.0-42.34](https://launchpad.net/ubuntu/+source/linux/5.3.0-42.34) | | | | [linux-image-5.3.0-42-lowlatency](https://launchpad.net/ubuntu/+source/linux) –  [5.3.0-42.34](https://launchpad.net/ubuntu/+source/linux/5.3.0-42.34) | | | | [linux-image-5.3.0-42-snapdragon](https://launchpad.net/ubuntu/+source/linux) –  [5.3.0-42.34](https://launchpad.net/ubuntu/+source/linux/5.3.0-42.34) | | | | [linux-image-aws](https://ubuntu.com/security/notices/None) –  5.3.0.1013.15 | | | | [linux-image-azure](https://ubuntu.com/security/notices/None) –  5.3.0.1016.35 | | | | [linux-image-gcp](https://ubuntu.com/security/notices/None) –  5.3.0.1014.15 | | | | [linux-image-generic](https://ubuntu.com/security/notices/None) –  5.3.0.42.36 | | | | [linux-image-generic-lpae](https://ubuntu.com/security/notices/None) –  5.3.0.42.36 | | | | [linux-image-gke](https://ubuntu.com/security/notices/None) –  5.3.0.1014.15 | | | | [linux-image-kvm](https://ubuntu.com/security/notices/None) –  5.3.0.1012.14 | | | | [linux-image-lowlatency](https://ubuntu.com/security/notices/None) –  5.3.0.42.36 | | | | [linux-image-oracle](https://ubuntu.com/security/notices/None) –  5.3.0.1011.12 | | | | [linux-image-raspi2](https://ubuntu.com/security/notices/None) –  5.3.0.1019.16 | | | | [linux-image-snapdragon](https://ubuntu.com/security/notices/None) –  5.3.0.42.36 | | | | [linux-image-virtual](https://ubuntu.com/security/notices/None) –  5.3.0.42.36 | | | | 18.04 LTS bionic | [linux-image-5.3.0-1014-gcp](https://launchpad.net/ubuntu/+source/linux-signed-gcp-5.3) –  [5.3.0-1014.15~18.04.1](https://launchpad.net/ubuntu/+source/linux-signed-gcp-5.3/5.3.0-1014.15~18.04.1) | | | | [linux-image-5.3.0-1014-gke](https://launchpad.net/ubuntu/+source/linux-signed-gke-5.3) –  [5.3.0-1014.15~18.04.1](https://launchpad.net/ubuntu/+source/linux-signed-gke-5.3/5.3.0-1014.15~18.04.1) | | | | [linux-image-5.3.0-1016-azure](https://launchpad.net/ubuntu/+source/linux-signed-azure-5.3) –  [5.3.0-1016.17~18.04.1](https://launchpad.net/ubuntu/+source/linux-signed-azure-5.3/5.3.0-1016.17~18.04.1) | | | | [linux-image-5.3.0-1019-raspi2](https://launchpad.net/ubuntu/+source/linux-raspi2-5.3) –  [5.3.0-1019.21~18.04.1](https://launchpad.net/ubuntu/+source/linux-raspi2-5.3/5.3.0-1019.21~18.04.1) | | | | [linux-image-5.3.0-42-generic](https://launchpad.net/ubuntu/+source/linux-signed-hwe) –  [5.3.0-42.34~18.04.1](https://launchpad.net/ubuntu/+source/linux-signed-hwe/5.3.0-42.34~18.04.1) | | | | [linux-image-5.3.0-42-generic-lpae](https://launchpad.net/ubuntu/+source/linux-hwe) –  [5.3.0-42.34~18.04.1](https://launchpad.net/ubuntu/+source/linux-hwe/5.3.0-42.34~18.04.1) | | | | [linux-image-5.3.0-42-lowlatency](https://launchpad.net/ubuntu/+source/linux-signed-hwe) –  [5.3.0-42.34~18.04.1](https://launchpad.net/ubuntu/+source/linux-signed-hwe/5.3.0-42.34~18.04.1) | | | | [linux-image-azure-edge](https://launchpad.net/ubuntu/+source/linux-meta-azure-5.3) –  [5.3.0.1016.16](https://launchpad.net/ubuntu/+source/linux-meta-azure-5.3/5.3.0.1016.16) | | | | [linux-image-gcp-edge](https://launchpad.net/ubuntu/+source/linux-meta-gcp-5.3) –  [5.3.0.1014.13](https://launchpad.net/ubuntu/+source/linux-meta-gcp-5.3/5.3.0.1014.13) | | | | [linux-image-generic-hwe-18.04](https://launchpad.net/ubuntu/+source/linux-meta-hwe) –  [5.3.0.42.99](https://launchpad.net/ubuntu/+source/linux-meta-hwe/5.3.0.42.99) | | | | [linux-image-generic-lpae-hwe-18.04](https://launchpad.net/ubuntu/+source/linux-meta-hwe) –  [5.3.0.42.99](https://launchpad.net/ubuntu/+source/linux-meta-hwe/5.3.0.42.99) | | | | [linux-image-gke-5.3](https://launchpad.net/ubuntu/+source/linux-meta-gke-5.3) –  [5.3.0.1014.4](https://launchpad.net/ubuntu/+source/linux-meta-gke-5.3/5.3.0.1014.4) | | | | [linux-image-lowlatency-hwe-18.04](https://launchpad.net/ubuntu/+source/linux-meta-hwe) –  [5.3.0.42.99](https://launchpad.net/ubuntu/+source/linux-meta-hwe/5.3.0.42.99) | | | | [linux-image-raspi2-hwe-18.04](https://launchpad.net/ubuntu/+source/linux-meta-raspi2-5.3) –  [5.3.0.1019.8](https://launchpad.net/ubuntu/+source/linux-meta-raspi2-5.3/5.3.0.1019.8) | | | | [linux-image-snapdragon-hwe-18.04](https://launchpad.net/ubuntu/+source/linux-meta-hwe) –  [5.3.0.42.99](https://launchpad.net/ubuntu/+source/linux-meta-hwe/5.3.0.42.99) | | | | [linux-image-virtual-hwe-18.04](https://launchpad.net/ubuntu/+source/linux-meta-hwe) –  [5.3.0.42.99](https://launchpad.net/ubuntu/+source/linux-meta-hwe/5.3.0.42.99) | | | --- ### Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. [Get Ubuntu Pro](https://ubuntu.com/pro) ## References * [CVE-2020-2732](https://ubuntu.com/security/CVE-2020-2732) * [CVE-2019-3016](https://ubuntu.com/security/CVE-2019-3016) * [CVE-2019-19068](https://ubuntu.com/security/CVE-2019-19068) * [CVE-2019-19066](https://ubuntu.com/security/CVE-2019-19066) * [CVE-2019-19064](https://ubuntu.com/security/CVE-2019-19064) * [CVE-2019-19059](https://ubuntu.com/security/CVE-2019-19059) * [CVE-2019-19058](https://ubuntu.com/security/CVE-2019-19058) * [CVE-2019-19056](https://ubuntu.com/security/CVE-2019-19056) * [CVE-2019-19053](https://ubuntu.com/security/CVE-2019-19053) * [CVE-2019-19043](https://ubuntu.com/security/CVE-2019-19043) --- Show 1 more references ## Related notices * [USN-4303-1](https://ubuntu.com/security/notices/USN-4303-1) * [USN-4303-2](https://ubuntu.com/security/notices/USN-4303-2) * [USN-4302-1](https://ubuntu.com/security/notices/USN-4302-1) * [USN-4301-1](https://ubuntu.com/security/notices/USN-4301-1) * [USN-4287-1](https://ubuntu.com/security/notices/USN-4287-1) * [USN-4287-2](https://ubuntu.com/security/notices/USN-4287-2) * [USN-4286-1](https://ubuntu.com/security/notices/USN-4286-1) * [USN-4286-2](https://ubuntu.com/security/notices/USN-4286-2) * [USN-4285-1](https://ubuntu.com/security/notices/USN-4285-1) * [LSN-0065-1](https://ubuntu.com/security/notices/LSN-0065-1) --- Have additional questions? 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