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USN-4890-1: Linux kernel vulnerabilities

29 March 2021

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-dell300x - Linux kernel for Dell 300x platforms
  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gcp-4.15 - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-hwe - Linux hardware enablement (HWE) kernel
  • linux-kvm - Linux kernel for cloud environments
  • linux-oracle - Linux kernel for Oracle Cloud systems
  • linux-raspi2 - Linux kernel for Raspberry Pi (V8) systems
  • linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors

Details

Piotr Krysiuk discovered that the BPF subsystem in the Linux kernel did not
properly compute a speculative execution limit on pointer arithmetic in
some situations. A local attacker could use this to expose sensitive
information (kernel memory). (CVE-2020-27171)

Piotr Krysiuk discovered that the BPF subsystem in the Linux kernel did not
properly apply speculative execution limits on some pointer types. A local
attacker could use this to expose sensitive information (kernel memory).
(CVE-2020-27170)

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
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-4887-1: linux-image-raspi-nolpae, linux-oracle, linux-image-generic-lpae-hwe-18.04-edge, linux-image-gcp-edge, linux-image-5.8.0-1022-kvm, linux-image-generic-lpae-hwe-18.04, linux-oem-5.6, linux-azure-5.4, linux-image-5.8.0-48-generic, linux-image-generic-64k-hwe-20.04-edge, linux-image-generic-64k-hwe-20.04, linux-image-generic, linux-image-generic-hwe-18.04-edge, linux-aws, linux-oem-5.10, linux-image-5.8.0-1019-raspi-nolpae, linux-image-gkeop-5.3, linux-image-oem-20.04, linux-gke-5.4, linux-image-5.4.0-1012-gkeop, linux-image-gkeop-5.4, linux-image-5.4.0-1040-gcp, linux-image-5.8.0-1024-oracle, linux-image-snapdragon-hwe-18.04-edge, linux-azure, linux-image-lowlatency-hwe-20.04, linux-image-raspi2-hwe-18.04, linux-image-5.10.0-1019-oem, linux-raspi, linux-gkeop, linux-image-virtual-hwe-18.04-edge, linux-image-5.4.0-1032-raspi, linux-image-virtual-hwe-20.04-edge, linux-image-5.4.0-70-lowlatency, linux-image-gcp, linux-image-aws-edge, linux-image-raspi-hwe-18.04-edge, linux-image-5.4.0-1036-kvm, linux-image-lowlatency-hwe-20.04-edge, linux-image-azure-edge, linux-image-oracle-edge, linux-image-oem-20.04b, linux-image-oem-osp1, linux-image-5.4.0-70-generic, linux-image-5.3.0-72-generic, linux-image-raspi, linux-image-5.3.0-1041-gke, linux-image-oem-20.04-edge, linux-kvm, linux-image-generic-lpae-hwe-20.04, linux-gcp-5.4, linux-image-gke-5.4, linux-oracle-5.4, linux-image-gke-5.3, linux-image-5.4.0-70-generic-lpae, linux-image-5.6.0-1052-oem, linux-image-generic-hwe-18.04, linux, linux-image-generic-hwe-20.04, linux-image-5.8.0-48-generic-lpae, linux-image-lowlatency-hwe-18.04, linux-image-5.3.0-1038-raspi2, linux-gkeop-5.4, linux-image-5.3.0-72-lowlatency, linux-gcp, linux-image-aws, linux-image-oem, linux-raspi2-5.3, linux-image-5.4.0-1041-oracle, linux-image-oracle, linux-image-snapdragon-hwe-18.04, linux-image-5.4.0-1039-gke, linux-aws-5.4, linux-image-5.4.0-1041-aws, linux-image-azure, linux-image-raspi2-hwe-18.04-edge, linux-image-virtual-hwe-20.04, linux-image-virtual-hwe-18.04, linux-image-lowlatency-hwe-18.04-edge, linux-hwe, linux-image-5.8.0-1027-aws, linux-image-generic-lpae, linux-image-gke, linux-image-5.8.0-1026-gcp, linux-raspi-5.4, linux-image-5.4.0-1043-azure, linux-image-generic-hwe-20.04-edge, linux-image-5.8.0-48-lowlatency, linux-image-5.8.0-1026-azure, linux-image-5.8.0-48-generic-64k, linux-image-virtual, linux-image-raspi2, linux-gke-5.3, linux-image-generic-64k, linux-image-lowlatency, linux-image-gkeop, linux-hwe-5.4, linux-image-raspi-hwe-18.04, linux-image-generic-lpae-hwe-20.04-edge, linux-image-5.8.0-1019-raspi, linux-hwe-5.8, linux-image-kvm