USN-4324-1: Linux kernel vulnerabilities

07 April 2020

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
  • linux-azure - Linux kernel for Microsoft Azure Cloud systems
  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gke-4.15 - Linux kernel for Google Container Engine (GKE) systems
  • linux-kvm - Linux kernel for cloud environments
  • linux-oem - Linux kernel for OEM processors
  • linux-oracle - Linux kernel for Oracle Cloud systems
  • linux-raspi2 - Linux kernel for Raspberry Pi 2
  • linux-snapdragon - Linux kernel for Snapdragon processors

Details

Al Viro discovered that the vfs layer in the Linux kernel contained a use-
after-free vulnerability. A local attacker could use this to cause a denial
of service (system crash) or possibly expose sensitive information (kernel
memory). (CVE-2020-8428)

Shijie Luo discovered that the ext4 file system implementation in the Linux
kernel did not properly check for a too-large journal size. An attacker
could use this to construct a malicious ext4 image that, when mounted,
could cause a denial of service (soft lockup). (CVE-2020-8992)

Update instructions

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

Ubuntu 18.04
Ubuntu 16.04
Ubuntu 14.04

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.

Related notices

  • USN-4325-1: linux-image-5.0.0-1036-azure, linux-oem-osp1, linux-gke-5.0, linux-image-5.0.0-1047-oem-osp1, linux-image-oracle, linux-oracle-5.0, linux-image-gke-5.0, linux-image-5.0.0-1033-gke, linux-gcp, linux-image-5.0.0-1014-oracle, linux-image-5.0.0-1034-gcp, linux-image-oem-osp1, linux-azure, linux-image-azure, linux-image-gcp
  • USN-4342-1: linux-image-5.3.0-1018-gcp, linux-image-kvm, linux-image-oracle, linux-image-gke, linux-image-generic-lpae-hwe-18.04, linux-image-5.3.0-51-generic, linux-azure, linux-image-snapdragon, linux-kvm, linux-image-5.3.0-51-lowlatency, linux-image-lowlatency-hwe-18.04, linux-image-5.3.0-1016-oracle, linux-image-virtual, linux-image-generic-lpae, linux-gcp, linux-image-5.3.0-1020-azure, linux-image-5.3.0-51-snapdragon, linux-image-gke-5.3, linux, linux-image-raspi2-hwe-18.04, linux-azure-5.3, linux-image-azure, linux-oracle-5.3, linux-image-5.3.0-1018-gke, linux-image-5.3.0-1023-raspi2, linux-image-snapdragon-hwe-18.04, linux-image-5.3.0-1016-kvm, linux-image-5.3.0-51-generic-lpae, linux-raspi2, linux-image-generic-hwe-18.04, linux-aws, linux-image-raspi2, linux-raspi2-5.3, linux-image-gcp, linux-gke-5.3, linux-gcp-5.3, linux-image-lowlatency, linux-hwe, linux-image-generic, linux-image-5.3.0-1017-aws, linux-image-aws, linux-oracle, linux-image-virtual-hwe-18.04
  • USN-4419-1: linux-image-powerpc64-smp-lts-xenial, linux-image-4.4.0-185-lowlatency, linux-image-kvm, linux-image-generic-lpae-lts-xenial, linux-image-4.4.0-185-powerpc-e500mc, linux-image-4.4.0-185-generic-lpae, linux-image-4.4.0-1110-aws, linux-image-snapdragon, linux-kvm, linux-snapdragon, linux-image-4.4.0-1139-snapdragon, linux-image-4.4.0-185-powerpc64-smp, linux-image-powerpc-e500mc-lts-xenial, linux-image-virtual, linux-image-4.4.0-185-powerpc-smp, linux-image-4.4.0-185-generic, linux-image-generic-lpae, linux-image-generic-lts-xenial, linux, linux-image-powerpc64-smp, linux-image-4.4.0-1074-aws, linux-image-lowlatency-lts-xenial, linux-raspi2, linux-image-4.4.0-1076-kvm, linux-aws, linux-image-raspi2, linux-image-powerpc64-emb-lts-xenial, linux-image-4.4.0-185-powerpc64-emb, linux-image-powerpc64-emb, linux-image-lowlatency, linux-image-generic, linux-image-virtual-lts-xenial, linux-image-aws, linux-image-powerpc-e500mc, linux-image-powerpc-smp, linux-lts-xenial, linux-image-4.4.0-1135-raspi2, linux-image-powerpc-smp-lts-xenial
  • USN-4319-1: linux-image-5.3.0-46-snapdragon, linux-image-5.3.0-1017-gcp, linux-image-kvm, linux-image-oracle, linux-image-gke, linux-image-5.3.0-1019-azure, linux-image-generic-lpae-hwe-18.04, linux-image-5.3.0-1022-raspi2, linux-azure, linux-image-snapdragon, linux-kvm, linux-image-azure-edge, linux-image-lowlatency-hwe-18.04, linux-image-virtual, linux-image-generic-lpae, linux-gcp, linux-image-raspi2-hwe-18.04, linux, linux-image-azure, linux-azure-5.3, linux-image-5.3.0-46-generic-lpae, linux-image-5.3.0-46-generic, linux-oracle-5.3, linux-image-snapdragon-hwe-18.04, linux-raspi2, linux-image-generic-hwe-18.04, linux-image-oracle-edge, linux-aws, linux-image-raspi2, linux-raspi2-5.3, linux-image-gcp, linux-gcp-5.3, linux-image-5.3.0-1016-aws, linux-image-lowlatency, linux-hwe, linux-image-generic, linux-image-5.3.0-1014-oracle, linux-image-aws, linux-image-gcp-edge, linux-oracle, linux-image-5.3.0-1015-kvm, linux-image-5.3.0-46-lowlatency, linux-image-virtual-hwe-18.04
  • USN-4344-1: linux-oem-osp1, linux-gke-5.0, linux-image-5.0.0-1050-oem-osp1, linux-image-5.0.0-1035-gke, linux-image-gke-5.0, linux-image-oem-osp1
  • USN-4320-1: linux-image-powerpc64-smp-lts-xenial, linux-image-kvm, linux-image-generic-lpae-lts-xenial, linux-image-4.4.0-177-generic-lpae, linux-image-4.4.0-1131-raspi2, linux-image-4.4.0-177-powerpc64-smp, linux-image-snapdragon, linux-kvm, linux-snapdragon, linux-image-powerpc-e500mc-lts-xenial, linux-image-virtual, linux-image-generic-lpae, linux-image-4.4.0-177-lowlatency, linux-image-4.4.0-177-powerpc-e500mc, linux, linux-image-generic-lts-xenial, linux-image-powerpc64-smp, linux-image-4.4.0-1069-kvm, linux-image-4.4.0-177-powerpc64-emb, linux-image-4.4.0-1065-aws, linux-image-lowlatency-lts-xenial, linux-raspi2, linux-aws, linux-image-raspi2, linux-image-powerpc64-emb-lts-xenial, linux-image-4.4.0-1135-snapdragon, linux-image-powerpc64-emb, linux-image-lowlatency, linux-image-generic, linux-image-virtual-lts-xenial, linux-image-4.4.0-177-generic, linux-image-aws, linux-image-powerpc-e500mc, linux-image-4.4.0-177-powerpc-smp, linux-image-powerpc-smp, linux-lts-xenial, linux-image-4.4.0-1105-aws, linux-image-powerpc-smp-lts-xenial
  • USN-4318-1: linux-image-virtual-hwe-16.04, linux-image-4.15.0-96-lowlatency, linux-image-powerpc64-smp, linux-image-lowlatency-hwe-16.04, linux-image-powerpc64-emb, linux-image-generic-hwe-16.04, linux-hwe, linux-image-lowlatency, linux-image-oem, linux-image-4.15.0-96-generic, linux-image-generic, linux-image-virtual, linux-image-generic-lpae, linux-image-powerpc-e500mc, linux-image-powerpc-smp, linux, linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-96-generic-lpae