1. Ubuntu Security Notices
  2. USN-5268-1

USN-5268-1: 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-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
  • linux-azure - 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 systems
  • linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors

Details

Keyu Man discovered that the ICMP implementation in the Linux kernel did
not properly handle received ICMP error packets. A remote attacker could
use this to facilitate attacks on UDP based services that depend on source
port randomization. (CVE-2021-20322)

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...

Keyu Man discovered that the ICMP implementation in the Linux kernel did
not properly handle received ICMP error packets. A remote attacker could
use this to facilitate attacks on UDP based services that depend on source
port randomization. (CVE-2021-20322)

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
18.04 bionic linux-image-4.15.0-1034-dell300x –  4.15.0-1034.39
linux-image-4.15.0-1086-oracle –  4.15.0-1086.94
linux-image-4.15.0-1102-raspi2 –  4.15.0-1102.109
linux-image-4.15.0-1106-kvm –  4.15.0-1106.108
linux-image-4.15.0-1115-gcp –  4.15.0-1115.129
linux-image-4.15.0-1119-snapdragon –  4.15.0-1119.128
linux-image-4.15.0-167-generic –  4.15.0-167.175
linux-image-4.15.0-167-generic-lpae –  4.15.0-167.175
linux-image-4.15.0-167-lowlatency –  4.15.0-167.175
linux-image-aws-lts-18.04 –  4.15.0.1119.122
linux-image-dell300x –  4.15.0.1034.36
linux-image-gcp-lts-18.04 –  4.15.0.1115.134
linux-image-generic –  4.15.0.167.156
linux-image-generic-lpae –  4.15.0.167.156
linux-image-kvm –  4.15.0.1106.102
linux-image-lowlatency –  4.15.0.167.156
linux-image-oracle-lts-18.04 –  4.15.0.1086.96
linux-image-raspi2 –  4.15.0.1102.100
linux-image-snapdragon –  4.15.0.1119.122
linux-image-virtual –  4.15.0.167.156
16.04 xenial linux-image-4.15.0-1086-oracle –  4.15.0-1086.94~16.04.1  
linux-image-4.15.0-1115-gcp –  4.15.0-1115.129~16.04.1  
linux-image-4.15.0-1130-azure –  4.15.0-1130.143~16.04.1  
linux-image-4.15.0-167-generic –  4.15.0-167.175~16.04.1  
linux-image-4.15.0-167-lowlatency –  4.15.0-167.175~16.04.1  
linux-image-aws-hwe –  4.15.0.1119.110  
linux-image-azure –  4.15.0.1130.121  
linux-image-gcp –  4.15.0.1115.116  
linux-image-generic-hwe-16.04 –  4.15.0.167.159  
linux-image-gke –  4.15.0.1115.116  
linux-image-lowlatency-hwe-16.04 –  4.15.0.167.159  
linux-image-lowlatency-hwe-16.04-edge –  4.15.0.167.159  
linux-image-oem –  4.15.0.167.159  
linux-image-oracle –  4.15.0.1086.74  
linux-image-virtual-hwe-16.04 –  4.15.0.167.159  
14.04 trusty linux-image-4.15.0-1130-azure –  4.15.0-1130.143~14.04.1  
linux-image-azure –  4.15.0.1130.103  

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.

Get Ubuntu Pro

References

Have additional questions?

Talk to a member of the team ›