1. Ubuntu Security Notices
  2. USN-5357-2

USN-5357-2: Linux kernel vulnerability

Publication date

31 March 2022

Overview

The system could be made to crash or run programs as an administrator.

Releases

Packages

  • linux-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
  • linux-azure - Linux kernel for Microsoft Azure Cloud systems
  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gcp-4.15 - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-oracle - Linux kernel for Oracle Cloud systems
  • linux-raspi2 - Linux kernel for Raspberry Pi systems

Details

It was discovered that the IPsec implementation in the Linux kernel did not
properly allocate enough memory when performing ESP transformations,
leading to a heap-based buffer overflow. A local attacker could use this to
cause a denial of service (system crash) or possibly execute arbitrary
code.

It was discovered that the IPsec implementation in the Linux kernel did not
properly allocate enough memory when performing ESP transformations,
leading to a heap-based buffer overflow. A local attacker could use this to
cause a denial of service (system crash) or possibly execute arbitrary
code.

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-4.15.0-1120-gcp –  4.15.0-1120.134
linux-image-gcp-lts-18.04 –  4.15.0.1120.139
linux-image-oracle-lts-18.04 –  4.15.0.1091.101
linux-image-4.15.0-1091-oracle –  4.15.0-1091.100
linux-image-raspi2 –  4.15.0.1107.105
linux-image-4.15.0-1107-raspi2 –  4.15.0-1107.114
16.04 xenial linux-image-azure –  4.15.0.1136.126  
linux-image-oracle –  4.15.0.1091.79  
linux-image-4.15.0-1126-aws-hwe –  4.15.0-1126.135~16.04.2  
linux-image-4.15.0-1120-gcp –  4.15.0-1120.134~16.04.1  
linux-image-gke –  4.15.0.1120.121  
linux-image-4.15.0-1091-oracle –  4.15.0-1091.100~16.04.1  
linux-image-gcp –  4.15.0.1120.121  
linux-image-4.15.0-1136-azure –  4.15.0-1136.149~16.04.1  
linux-image-aws-hwe –  4.15.0.1126.116  
14.04 trusty linux-image-azure –  4.15.0.1136.108  
linux-image-4.15.0-1136-azure –  4.15.0-1136.149~14.04.1  

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References

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