Ubuntu Security Update USN-4313-1: Linux kernel vulnerability

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linux, linux-aws, linux-azure, linux-azure-5.3, linux-gcp, linux-gcp-5.3, linux-gke-5.3, linux-hwe, linux-kvm, linux-oracle, linux-oracle-5.3, linux-raspi2, linux-raspi2-5.3 vulnerability


A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 19.10
  • Ubuntu 18.04 LTS
Summary


The system could be made to expose sensitive information or run programs as an administrator.

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-oracle - Linux kernel for Oracle Cloud systems
  • linux-raspi2 - Linux kernel for Raspberry Pi 2
  • linux-azure-5.3 - Linux kernel for Microsoft Azure Cloud systems
  • linux-gcp-5.3 - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gke-5.3 - Linux kernel for Google Container Engine (GKE) systems
  • linux-hwe - Linux hardware enablement (HWE) kernel
  • linux-oracle-5.3 - Linux kernel buildinfo for version 5.3.0 on 64 bit x86 SMP
  • linux-raspi2-5.3 - Linux kernel for Raspberry Pi 2
Details


Manfred Paul discovered that the bpf verifier in the Linux kernel did not properly calculate register bounds for certain operations. A local attacker could use this to expose sensitive information (kernel memory) or gain administrative privileges.

Update instructions


The problem can be corrected by updating your system to the following package versions:

Ubuntu 19.10
linux-image-5.3.0-1013-oracle - 5.3.0-1013.14
linux-image-5.3.0-1014-kvm - 5.3.0-1014.15
linux-image-5.3.0-1015-aws - 5.3.0-1015.16
linux-image-5.3.0-1016-gcp - 5.3.0-1016.17
linux-image-5.3.0-1018-azure - 5.3.0-1018.19
linux-image-5.3.0-1021-raspi2 - 5.3.0-1021.23
linux-image-5.3.0-45-generic - 5.3.0-45.37
linux-image-5.3.0-45-generic-lpae - 5.3.0-45.37
linux-image-5.3.0-45-lowlatency - 5.3.0-45.37
linux-image-5.3.0-45-snapdragon - 5.3.0-45.37
linux-image-aws - 5.3.0.1015.17
linux-image-azure - 5.3.0.1018.37
linux-image-gcp - 5.3.0.1016.17
linux-image-generic - 5.3.0.45.38
linux-image-generic-lpae - 5.3.0.45.38
linux-image-gke - 5.3.0.1016.17
linux-image-kvm - 5.3.0.1014.16
linux-image-lowlatency - 5.3.0.45.38
linux-image-oracle - 5.3.0.1013.14
linux-image-raspi2 - 5.3.0.1021.18
linux-image-snapdragon - 5.3.0.45.38
linux-image-virtual - 5.3.0.45.38
Ubuntu 18.04 LTS
linux-image-5.3.0-1013-oracle - 5.3.0-1013.14~18.04.1
linux-image-5.3.0-1016-gcp - 5.3.0-1016.17~18.04.1
linux-image-5.3.0-1016-gke - 5.3.0-1016.17~18.04.1
linux-image-5.3.0-1018-azure - 5.3.0-1018.19~18.04.1
linux-image-5.3.0-1021-raspi2 - 5.3.0-1021.23~18.04.1
linux-image-5.3.0-45-generic - 5.3.0-45.37~18.04.1
linux-image-5.3.0-45-generic-lpae - 5.3.0-45.37~18.04.1
linux-image-5.3.0-45-lowlatency - 5.3.0-45.37~18.04.1
linux-image-azure-edge - 5.3.0.1018.18
linux-image-gcp-edge - 5.3.0.1016.15
linux-image-generic-hwe-18.04 - 5.3.0.45.101
linux-image-generic-lpae-hwe-18.04 - 5.3.0.45.101
linux-image-gke-5.3 - 5.3.0.1016.6
linux-image-lowlatency-hwe-18.04 - 5.3.0.45.101
linux-image-oracle-edge - 5.3.0.1013.12
linux-image-raspi2-hwe-18.04 - 5.3.0.1021.10
linux-image-snapdragon-hwe-18.04 - 5.3.0.45.101
linux-image-virtual-hwe-18.04 - 5.3.0.45.101

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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


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