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USN-4363-1: Linux kernel vulnerabilities

28 May 2020

Several security issues were fixed in the Linux kernel.

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.

Learn more about Ubuntu Pro

Releases

Packages

  • linux - Linux kernel
  • 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-azure-4.15 - 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-hwe - Linux hardware enablement (HWE) kernel
  • linux-kvm - Linux kernel for cloud environments
  • linux-oem - Linux kernel for OEM systems
  • linux-oracle - Linux kernel for Oracle Cloud systems
  • linux-raspi2 - Linux kernel for Raspberry Pi (V7) systems
  • linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors

Details

It was discovered that the Serial CAN interface driver in the Linux kernel
did not properly initialize data. A local attacker could use this to expose
sensitive information (kernel memory). (CVE-2020-11494)

It was discovered that the linux kernel did not properly validate certain
mount options to the tmpfs virtual memory file system. A local attacker
with the ability to specify mount options could use this to cause a denial
of service (system crash). (CVE-2020-11565)

David Gibson discovered that the Linux kernel on Power9 CPUs did not
properly save and restore Authority Mask registers state in some
situations. A local attacker in a guest VM could use this to cause a denial
of service (host system crash). (CVE-2020-11669)

It was discovered that the block layer in the Linux kernel contained a race
condition leading to a use-after-free vulnerability. A local attacker could
possibly use this to cause a denial of service (system crash) or execute
arbitrary code. (CVE-2020-12657)

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.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 18.04
Ubuntu 16.04

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-4369-1: linux-image-5.3.0-1020-gke, linux-image-lowlatency, linux-image-gcp, linux-image-generic-lpae-hwe-18.04-edge, linux-image-snapdragon, linux, linux-image-gke, linux-aws, linux-image-5.3.0-53-generic-lpae, linux-image-aws-edge, linux-image-5.3.0-1019-aws, linux-image-5.3.0-53-lowlatency, linux-gcp, linux-image-5.3.0-53-generic, linux-image-gcp-edge, linux-image-azure-edge, linux-image-kvm, linux-image-lowlatency-hwe-18.04, linux-image-5.3.0-1017-kvm, linux-image-oracle-edge, linux-image-snapdragon-hwe-18.04, linux-image-raspi2, linux-image-virtual-hwe-18.04, linux-image-gkeop-5.3, linux-aws-5.3, linux-hwe, linux-image-generic-hwe-18.04, linux-image-virtual-hwe-18.04-edge, linux-gcp-5.3, linux-gke-5.3, linux-image-5.3.0-1020-gcp, linux-image-azure, linux-image-generic-lpae, linux-image-lowlatency-hwe-18.04-edge, linux-image-5.3.0-1018-oracle, linux-image-generic-lpae-hwe-18.04, linux-image-virtual, linux-image-oracle, linux-image-snapdragon-hwe-18.04-edge, linux-image-generic, linux-kvm, linux-image-5.3.0-1022-azure, linux-image-aws, linux-azure, linux-raspi2, linux-image-5.3.0-53-snapdragon, linux-oracle-5.3, linux-image-5.3.0-1025-raspi2, linux-image-gke-5.3, linux-azure-5.3, linux-oracle, linux-image-generic-hwe-18.04-edge
  • USN-4364-1: linux-image-powerpc64-emb-lts-vivid, linux-image-4.4.0-1107-aws, linux-image-powerpc-e500mc-lts-wily, linux-image-lowlatency, linux-image-lowlatency-lts-utopic, linux-image-generic-lts-vivid, linux-image-4.4.0-179-lowlatency, linux-image-powerpc64-emb-lts-utopic, linux-image-generic-lts-utopic, linux-image-powerpc64-smp-lts-utopic, linux-image-4.4.0-179-powerpc64-emb, linux, linux-image-snapdragon, linux-image-virtual-lts-utopic, linux-image-powerpc-e500mc-lts-xenial, linux-image-powerpc64-smp-lts-xenial, linux-aws, linux-image-generic-lpae-lts-xenial, linux-image-kvm, linux-image-4.4.0-1067-aws, linux-image-powerpc-e500mc-lts-utopic, linux-image-powerpc64-emb, linux-image-powerpc64-emb-lts-wily, linux-image-powerpc64-smp-lts-vivid, linux-image-virtual, linux-lts-xenial, linux-image-powerpc64-smp-lts-wily, linux-image-virtual-lts-vivid, linux-image-lowlatency-lts-wily, linux-image-powerpc-smp, linux-image-lowlatency-lts-vivid, linux-image-4.4.0-179-powerpc64-smp, linux-image-powerpc-smp-lts-xenial, linux-image-generic-lpae-lts-vivid, linux-image-raspi2, linux-image-4.4.0-1133-raspi2, linux-image-virtual-lts-xenial, linux-image-4.4.0-179-generic, linux-snapdragon, linux-image-generic-lpae-lts-wily, linux-image-generic-lpae, linux-image-generic-lpae-lts-utopic, linux-image-lowlatency-lts-xenial, linux-image-powerpc64-emb-lts-xenial, linux-image-powerpc-e500mc, linux-image-powerpc-e500mc-lts-vivid, linux-image-generic, linux-image-4.4.0-1071-kvm, linux-kvm, linux-image-4.4.0-179-powerpc-smp, linux-image-aws, linux-image-generic-lts-wily, linux-raspi2, linux-image-4.4.0-179-generic-lpae, linux-image-powerpc-smp-lts-vivid, linux-image-4.4.0-179-powerpc-e500mc, linux-image-generic-lts-xenial, linux-image-virtual-lts-wily, linux-image-powerpc-smp-lts-wily, linux-image-powerpc64-smp, linux-image-powerpc-smp-lts-utopic, linux-image-4.4.0-1137-snapdragon
  • USN-4368-1: linux-gke-5.0, linux-image-5.0.0-1052-oem-osp1, linux-oem-osp1, linux-image-5.0.0-1037-gke, linux-image-oem-osp1, linux-image-gke-5.0
  • LSN-0067-1: lowlatency-4.4, lowlatency-4.15, azure, generic-4.15, generic-4.4, aws, gcp, oem
  • LSN-0068-1: lowlatency-4.4, lowlatency-4.15, generic-4.15, generic-4.4, aws, oem
  • LSN-0072-1: lowlatency-4.4, lowlatency-4.15, azure, generic-4.15, lowlatency-5.4, generic-4.4, aws, generic-5.4, gcp, oem
  • USN-4367-1: linux-image-oem, linux-image-5.4.0-31-generic-lpae, linux-image-lowlatency, linux-image-5.4.0-31-generic, linux-image-gcp, linux-image-generic-lpae-hwe-18.04-edge, linux, linux-image-5.4.0-1011-raspi, linux-image-generic-hwe-20.04, linux-image-virtual-hwe-20.04, linux-image-lowlatency-hwe-20.04, linux-image-gke, linux-aws, linux-image-kvm, linux-image-lowlatency-hwe-18.04, linux-image-raspi, linux-image-virtual, linux-gcp, linux-image-5.4.0-1011-aws, linux-image-5.4.0-1011-oracle, linux-image-raspi2, linux-image-virtual-hwe-18.04, linux-image-generic-lpae-hwe-20.04, linux-image-5.4.0-1011-gcp, linux-image-generic-hwe-18.04, linux-image-5.4.0-31-lowlatency, linux-image-virtual-hwe-18.04-edge, linux-image-generic-lpae, linux-image-azure, linux-image-lowlatency-hwe-18.04-edge, linux-image-generic-lpae-hwe-18.04, linux-image-oracle, linux-image-generic, linux-kvm, linux-image-aws, linux-azure, linux-riscv, linux-image-5.4.0-1012-azure, linux-image-5.4.0-1011-kvm, linux-image-oem-osp1, linux-oracle, linux-image-5.4.0-26-generic, linux-image-generic-hwe-18.04-edge, linux-raspi