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USN-4977-1: Linux kernel vulnerabilities

3 June 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-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-raspi - Linux kernel for Raspberry Pi (V8) systems

Details

Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the
Linux kernel contained a reference counting error. A local attacker could
use this to cause a denial of service (system crash). (CVE-2020-25670)

Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the
Linux kernel did not properly deallocate memory in certain error
situations. A local attacker could use this to cause a denial of service
(memory exhaustion). (CVE-2020-25671, CVE-2020-25672)

Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the
Linux kernel did not properly handle error conditions in some situations,
leading to an infinite loop. A local attacker could use this to cause a
denial of service. (CVE-2020-25673)

Piotr Krysiuk and Benedict Schlueter discovered that the eBPF
implementation in the Linux kernel performed out of bounds speculation on
pointer arithmetic. A local attacker could use this to expose sensitive
information. (CVE-2021-29155)

Reiji Watanabe discovered that the KVM VMX implementation in the Linux
kernel did not properly prevent user space from tampering with an array
index value, leading to a potential out-of-bounds write. A local attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2021-3501)

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 21.04

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-4979-1: linux-gcp-4.15, linux-image-4.15.0-1103-aws, linux-image-snapdragon, linux-image-azure-edge, linux-image-lowlatency-hwe-16.04-edge, linux-image-4.15.0-1072-oracle, linux-kvm, linux-image-raspi2, linux-snapdragon, linux-image-virtual-hwe-16.04, linux-image-aws-hwe, linux-image-gcp-lts-18.04, linux-image-4.15.0-1103-snapdragon, linux-image-generic-hwe-16.04, linux-gcp, linux-azure-4.15, linux-image-generic-lpae, linux-image-oem, linux-azure, linux-image-lowlatency-hwe-16.04, linux-image-virtual, linux-image-oracle-lts-18.04, linux-image-gke, linux-image-oracle, linux-aws-hwe, linux-image-4.15.0-144-generic, linux-image-azure-lts-18.04, linux-image-generic, linux-image-4.15.0-1100-gcp, linux-image-lowlatency, linux-image-virtual-hwe-16.04-edge, linux-hwe, linux-image-4.15.0-1092-kvm, linux-image-azure, linux-image-4.15.0-144-generic-lpae, linux-image-kvm, linux-raspi2, linux-image-generic-lpae-hwe-16.04-edge, linux-image-generic-lpae-hwe-16.04, linux-image-generic-hwe-16.04-edge, linux-image-4.15.0-144-lowlatency, linux-image-4.15.0-1086-raspi2, linux-image-gcp, linux-image-aws-lts-18.04, linux, linux-aws, linux-image-4.15.0-1115-azure, linux-oracle
  • USN-4982-1: linux-image-5.4.0-1036-raspi, linux-hwe-5.4, linux-oracle-5.4, linux-image-virtual-hwe-18.04, linux-gkeop-5.4, linux-image-generic-lpae-hwe-18.04-edge, linux-image-azure-edge, linux-kvm, linux-image-raspi2, linux-raspi-5.4, linux-image-generic-hwe-18.04, linux-image-oem, linux-gcp, linux-image-generic-lpae, linux-image-raspi-hwe-18.04-edge, linux-image-gkeop, linux-image-aws, linux-image-raspi2-hwe-18.04, linux-azure, linux-image-generic-hwe-18.04-edge, linux-image-oracle-edge, linux-image-5.4.0-74-generic, linux-image-raspi2-hwe-18.04-edge, linux-image-aws-edge, linux-image-lowlatency-hwe-18.04-edge, linux-azure-5.4, linux-raspi, linux-image-5.4.0-1044-gke, linux-image-virtual, linux-image-5.4.0-1049-aws, linux-image-gke, linux-gke, linux-image-gcp-edge, linux-image-gkeop-5.4, linux-image-5.4.0-1044-gcp, linux-image-generic-lpae-hwe-18.04, linux-image-oracle, linux-gcp-5.4, linux-image-generic, linux-image-snapdragon-hwe-18.04, linux-image-lowlatency, linux-image-virtual-hwe-18.04-edge, linux-image-gke-5.4, linux-image-azure, linux-image-kvm, linux-image-raspi-hwe-18.04, linux-image-5.4.0-1016-gkeop, linux-image-oem-osp1, linux-gkeop, linux-image-5.4.0-74-generic-lpae, linux-aws-5.4, linux-image-raspi, linux-image-5.4.0-74-lowlatency, linux-image-snapdragon-hwe-18.04-edge, linux-image-5.4.0-1046-oracle, linux-image-5.4.0-1048-azure, linux-image-gcp, linux-image-5.4.0-1040-kvm, linux-image-lowlatency-hwe-18.04, linux-gke-5.4, linux, linux-aws, linux-oracle
  • USN-4999-1: linux-image-5.8.0-1038-aws, linux-image-azure-edge, linux-kvm, linux-image-lowlatency-hwe-20.04, linux-gcp, linux-image-generic-lpae, linux-image-5.8.0-1035-gcp, linux-image-aws, linux-image-generic-hwe-20.04-edge, linux-hwe-5.8, linux-azure, linux-image-oracle-edge, linux-image-5.8.0-59-generic-lpae, linux-image-5.8.0-59-lowlatency, linux-image-generic-lpae-hwe-20.04-edge, linux-aws-5.8, linux-image-virtual-hwe-20.04-edge, linux-raspi, linux-image-5.8.0-59-generic-64k, linux-image-virtual, linux-image-gke, linux-image-gcp-edge, linux-image-5.8.0-1029-raspi-nolpae, linux-image-oracle, linux-image-5.8.0-1029-raspi, linux-image-generic, linux-image-5.8.0-1036-azure, linux-image-lowlatency, linux-image-5.8.0-1033-oracle, linux-image-raspi-nolpae, linux-image-azure, linux-azure-5.8, linux-image-kvm, linux-image-generic-hwe-20.04, linux-image-generic-64k-hwe-20.04, linux-gcp-5.8, linux-image-virtual-hwe-20.04, linux-image-generic-64k-hwe-20.04-edge, linux-image-5.8.0-59-generic, linux-image-generic-lpae-hwe-20.04, linux-image-generic-64k, linux-image-raspi, linux-image-5.8.0-1030-kvm, linux-image-oem-20.04, linux-oracle-5.8, linux-image-gcp, linux, linux-aws, linux-image-lowlatency-hwe-20.04-edge, linux-oracle
  • USN-5343-1: linux-image-lowlatency-lts-utopic, linux-generic-lts-utopic, linux-headers-generic-lts-vivid, linux-kvm-headers-4.4.0-1103, linux-tools-4.4.0-1102-aws, linux-signed-image-generic-lts-xenial, linux-generic-lts-wily, linux-modules-4.4.0-1138-aws, linux-image-virtual-lts-xenial, linux-generic, linux-cloud-tools-lowlatency-lts-vivid, linux-image-aws, linux-cloud-tools-4.4.0-1138-aws, linux-kvm-cloud-tools-4.4.0-1103, linux-buildinfo-4.4.0-1103-kvm, linux-lowlatency-lts-utopic, linux-tools-4.4.0-1138-aws, linux-signed-image-lowlatency-lts-wily, linux-image-virtual, linux-tools-4.4.0-1103-kvm, linux-tools-lts-utopic, linux-lts-xenial-cloud-tools-4.4.0-222, linux-cloud-tools-4.4.0-222-generic, linux-lts-xenial-tools-4.4.0-222, linux-image-generic-lts-vivid, linux-cloud-tools-virtual-lts-utopic, linux-tools-4.4.0-222, linux-headers-lowlatency-lts-xenial, linux-lts-xenial, linux-image-4.4.0-1103-kvm, linux-tools-generic-lts-utopic, linux-headers-4.4.0-222, linux-signed-lowlatency-lts-wily, linux-headers-lowlatency-lts-vivid, linux-image-hwe-generic-trusty, linux-signed-lowlatency, linux-virtual-lts-utopic, linux-signed-generic-lts-xenial, linux-image-4.4.0-222-lowlatency, linux-signed-image-generic-lts-utopic, linux-modules-4.4.0-1103-kvm, linux-headers-virtual-lts-xenial, linux, linux-virtual-lts-xenial, linux-aws, linux-signed-image-generic, linux-image-extra-virtual-lts-vivid, linux-headers-lowlatency, linux-cloud-tools-generic-lts-vivid, linux-headers-generic, linux-cloud-tools-lowlatency, linux-aws-cloud-tools-4.4.0-1138, linux-cloud-tools-generic, linux-headers-4.4.0-222-lowlatency, linux-modules-4.4.0-1102-aws, linux-cloud-tools-4.4.0-1103-kvm, linux-headers-lowlatency-lts-wily, linux-image-generic-lts-utopic, linux-lowlatency-lts-vivid, linux-headers-generic-lts-utopic, linux-tools-lowlatency, linux-image-extra-virtual-lts-wily, linux-headers-virtual, linux-image-virtual-lts-utopic, linux-signed-generic-lts-utopic, linux-libc-dev, linux-image-lowlatency, linux-image-kvm, linux-lowlatency-lts-wily, linux-tools-generic-lts-xenial, linux-headers-kvm, linux-cloud-tools-4.4.0-222-lowlatency, linux-headers-generic-lts-wily, linux-doc, linux-image-4.4.0-1102-aws, linux-tools-common, linux-tools-kvm, linux-modules-extra-4.4.0-222-generic, linux-cloud-tools-4.4.0-222, linux-tools-4.4.0-222-lowlatency, linux-headers-virtual-lts-utopic, linux-tools-lowlatency-lts-vivid, linux-tools-virtual-lts-vivid, linux-kvm, linux-headers-aws, linux-cloud-tools-lowlatency-lts-wily, linux-image-virtual-lts-wily, linux-image-virtual-lts-vivid, linux-signed-generic-lts-vivid, linux-headers-generic-lts-xenial, linux-buildinfo-4.4.0-1138-aws, linux-signed-generic-lts-wily, linux-signed-lowlatency-lts-xenial, linux-modules-extra-aws, linux-generic-lts-vivid, linux-signed-image-lowlatency, linux-modules-4.4.0-222-generic, linux-image-hwe-virtual-trusty, linux-virtual-lts-vivid, linux-image-extra-virtual-lts-utopic, linux-signed-image-lowlatency-lts-xenial, linux-cloud-tools-virtual-lts-vivid, linux-hwe-virtual-trusty, linux-image-unsigned-4.4.0-222-lowlatency, linux-cloud-tools-generic-lts-wily, linux-image-generic, linux-signed-image-generic-lts-vivid, linux-kvm-tools-4.4.0-1103, linux-crashdump, linux-image-4.4.0-1138-aws, linux-cloud-tools-virtual, linux-tools-virtual-lts-utopic, linux-tools-virtual-lts-xenial, linux-headers-4.4.0-1102-aws, linux-cloud-tools-common, linux-tools-generic-lts-vivid, linux-image-extra-virtual-lts-xenial, linux-tools-4.4.0-222-generic, linux-buildinfo-4.4.0-1102-aws, linux-image-4.4.0-222-generic, linux-aws-tools-4.4.0-1102, linux-lowlatency-lts-xenial, linux-aws-headers-4.4.0-1102, linux-tools-aws, linux-tools-lowlatency-lts-utopic, linux-image-extra-virtual, linux-image-lowlatency-lts-wily, linux-aws-tools-4.4.0-1138, linux-cloud-tools-4.4.0-1102-aws, linux-lowlatency, linux-tools-generic-lts-wily, linux-signed-image-generic-lts-wily, linux-headers-virtual-lts-vivid, linux-virtual-lts-wily, linux-cloud-tools-lowlatency-lts-utopic, linux-tools-generic, linux-image-lowlatency-lts-xenial, linux-cloud-tools-virtual-lts-xenial, linux-generic-lts-xenial, linux-headers-4.4.0-222-generic, linux-aws-cloud-tools-4.4.0-1102, linux-cloud-tools-lowlatency-lts-xenial, linux-source, linux-headers-4.4.0-1138-aws, linux-image-generic-lts-wily, linux-source-4.4.0, linux-signed-generic, linux-hwe-generic-trusty, linux-headers-lowlatency-lts-utopic, linux-buildinfo-4.4.0-222-lowlatency, linux-headers-4.4.0-1103-kvm, linux-headers-virtual-lts-wily, linux-tools-virtual, linux-image-lowlatency-lts-vivid, linux-cloud-tools-virtual-lts-wily, linux-cloud-tools-generic-lts-utopic, linux-modules-extra-4.4.0-1138-aws, linux-tools-virtual-lts-wily, linux-tools-host, linux-aws-headers-4.4.0-1138, linux-tools-lowlatency-lts-xenial, linux-image-unsigned-4.4.0-222-generic, linux-modules-4.4.0-222-lowlatency, linux-virtual, linux-image-generic-lts-xenial, linux-buildinfo-4.4.0-222-generic, linux-tools-lowlatency-lts-wily, linux-cloud-tools-generic-lts-xenial
  • USN-4983-1: linux-oem-5.10, linux-image-oem-20.04b, linux-image-oem-20.04, linux-image-oem-20.04-edge, linux-image-5.10.0-1029-oem
  • USN-4948-1: linux-image-5.10.0-1026-oem, linux-oem-5.10, linux-image-oem-20.04b, linux-image-oem-20.04-edge