1. Ubuntu Security Notices
  2. USN-5267-1

USN-5267-1: Linux kernel vulnerabilities

Publication date

3 February 2022

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • linux - Linux kernel
  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-aws-5.4 - Linux kernel for Amazon Web Services (AWS) systems
  • linux-azure - Linux kernel for Microsoft Azure Cloud systems
  • linux-azure-5.4 - Linux kernel for Microsoft Azure cloud systems
  • linux-bluefield - Linux kernel for NVIDIA BlueField platforms
  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gcp-5.4 - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gkeop - Linux kernel for Google Container Engine (GKE) systems
  • linux-gkeop-5.4 - Linux kernel for Google Container Engine (GKE) systems
  • linux-hwe-5.4 - Linux hardware enablement (HWE) kernel
  • linux-ibm - Linux kernel for IBM cloud systems
  • linux-kvm - Linux kernel for cloud environments
  • linux-oracle - Linux kernel for Oracle Cloud systems
  • linux-oracle-5.4 - Linux kernel for Oracle Cloud systems

Details

It was discovered that the Bluetooth subsystem 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 execute arbitrary
code. (CVE-2021-3640)

Likang Luo discovered that a race condition existed in the Bluetooth
subsystem of the Linux kernel, leading to a use-after-free vulnerability. A
local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2021-3752)

Luo Likang discovered that the FireDTV Firewire driver in the Linux kernel
did not properly perform bounds checking in some situations. A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2021-42739)

It was discovered that the Bluetooth subsystem 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 execute arbitrary
code. (CVE-2021-3640)

Likang Luo discovered that a race condition existed in the Bluetooth
subsystem of the Linux kernel, leading to a use-after-free vulnerability. A
local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2021-3752)

Luo Likang discovered that the FireDTV Firewire driver in the Linux kernel
did not properly perform bounds checking in some situations. A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2021-42739)

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
20.04 focal linux-image-ibm –  5.4.0.1013.14
linux-image-generic-hwe-18.04 –  5.4.0.97.101
linux-image-gkeop –  5.4.0.1032.35
linux-image-virtual –  5.4.0.97.101
linux-image-generic –  5.4.0.97.101
linux-image-5.4.0-1063-gcp –  5.4.0-1063.67
linux-image-bluefield –  5.4.0.1026.27
linux-image-oem-osp1 –  5.4.0.97.101
linux-image-5.4.0-1032-gkeop –  5.4.0-1032.33
linux-image-generic-lpae-hwe-18.04 –  5.4.0.97.101
linux-image-5.4.0-97-lowlatency –  5.4.0-97.110
linux-image-5.4.0-1013-ibm –  5.4.0-1013.14
linux-image-azure-lts-20.04 –  5.4.0.1068.66
linux-image-5.4.0-97-generic-lpae –  5.4.0-97.110
linux-image-5.4.0-1064-aws –  5.4.0-1064.67
linux-image-5.4.0-1026-bluefield –  5.4.0-1026.29
linux-image-gkeop-5.4 –  5.4.0.1032.35
linux-image-generic-lpae-hwe-18.04-edge –  5.4.0.97.101
linux-image-lowlatency –  5.4.0.97.101
linux-image-5.4.0-1062-oracle –  5.4.0-1062.66
linux-image-gcp-lts-20.04 –  5.4.0.1063.73
linux-image-ibm-lts-20.04 –  5.4.0.1013.14
linux-image-lowlatency-hwe-18.04-edge –  5.4.0.97.101
linux-image-aws-lts-20.04 –  5.4.0.1064.66
linux-image-generic-hwe-18.04-edge –  5.4.0.97.101
linux-image-oracle-lts-20.04 –  5.4.0.1062.62
linux-image-virtual-hwe-18.04 –  5.4.0.97.101
linux-image-lowlatency-hwe-18.04 –  5.4.0.97.101
linux-image-5.4.0-1068-azure –  5.4.0-1068.71
linux-image-5.4.0-1054-kvm –  5.4.0-1054.56
linux-image-kvm –  5.4.0.1054.53
linux-image-oem –  5.4.0.97.101
linux-image-5.4.0-97-generic –  5.4.0-97.110
linux-image-generic-lpae –  5.4.0.97.101
linux-image-virtual-hwe-18.04-edge –  5.4.0.97.101
18.04 bionic linux-image-gkeop-5.4 –  5.4.0.1032.33~18.04.32
linux-image-generic-hwe-18.04 –  5.4.0.97.110~18.04.85
linux-image-snapdragon-hwe-18.04 –  5.4.0.97.110~18.04.85
linux-image-oem –  5.4.0.97.110~18.04.85
linux-image-aws –  5.4.0.1064.46
linux-image-5.4.0-1062-oracle –  5.4.0-1062.66~18.04.1
linux-image-5.4.0-1063-gcp –  5.4.0-1063.67~18.04.1
linux-image-oem-osp1 –  5.4.0.97.110~18.04.85
linux-image-5.4.0-1032-gkeop –  5.4.0-1032.33~18.04.1
linux-image-generic-lpae-hwe-18.04 –  5.4.0.97.110~18.04.85
linux-image-5.4.0-97-lowlatency –  5.4.0-97.110~18.04.1
linux-image-5.4.0-97-generic-lpae –  5.4.0-97.110~18.04.1
linux-image-azure –  5.4.0.1068.47
linux-image-gcp –  5.4.0.1063.48
linux-image-oracle –  5.4.0.1062.66~18.04.41
linux-image-virtual-hwe-18.04 –  5.4.0.97.110~18.04.85
linux-image-lowlatency-hwe-18.04 –  5.4.0.97.110~18.04.85
linux-image-5.4.0-1068-azure –  5.4.0-1068.71~18.04.1
linux-image-5.4.0-97-generic –  5.4.0-97.110~18.04.1

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References

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