1. Ubuntu Security Notices
  2. USN-4727-1

USN-4727-1: Linux kernel vulnerability

Publication date

10 February 2021

Overview

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

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-hwe-5.8 - Linux hardware enablement (HWE) kernel
  • linux-kvm - Linux kernel for cloud environments
  • linux-oem-5.6 - Linux kernel for OEM systems
  • linux-oracle - Linux kernel for Oracle Cloud systems
  • linux-raspi - Linux kernel for Raspberry Pi (V8) systems

Details

Alexander Popov discovered that multiple race conditions existed in the
AF_VSOCK implementation in the Linux kernel. A local attacker could use
this to cause a denial of service (system crash) or execute arbitrary code.

Alexander Popov discovered that multiple race conditions existed in the
AF_VSOCK implementation in the Linux kernel. A local attacker could use
this to cause a denial of service (system crash) or 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
20.10 groovy linux-image-5.8.0-1015-raspi –  5.8.0-1015.18
linux-image-5.8.0-1015-raspi-nolpae –  5.8.0-1015.18
linux-image-5.8.0-1018-kvm –  5.8.0-1018.20
linux-image-5.8.0-1020-oracle –  5.8.0-1020.21
linux-image-5.8.0-1022-azure –  5.8.0-1022.24
linux-image-5.8.0-1022-gcp –  5.8.0-1022.23
linux-image-5.8.0-1023-aws –  5.8.0-1023.25
linux-image-5.8.0-43-generic –  5.8.0-43.49
linux-image-5.8.0-43-generic-64k –  5.8.0-43.49
linux-image-5.8.0-43-generic-lpae –  5.8.0-43.49
linux-image-5.8.0-43-lowlatency –  5.8.0-43.49
linux-image-aws –  5.8.0.1023.25
linux-image-azure –  5.8.0.1022.22
linux-image-gcp –  5.8.0.1022.22
linux-image-generic –  5.8.0.43.48
linux-image-generic-64k –  5.8.0.43.48
linux-image-generic-lpae –  5.8.0.43.48
linux-image-gke –  5.8.0.1022.22
linux-image-kvm –  5.8.0.1018.20
linux-image-lowlatency –  5.8.0.43.48
linux-image-oracle –  5.8.0.1020.19
linux-image-raspi –  5.8.0.1015.18
linux-image-raspi-nolpae –  5.8.0.1015.18
linux-image-virtual –  5.8.0.43.48
20.04 focal linux-image-5.6.0-1047-oem –  5.6.0-1047.51
linux-image-5.8.0-43-generic –  5.8.0-43.49~20.04.1
linux-image-5.8.0-43-generic-lpae –  5.8.0-43.49~20.04.1
linux-image-5.8.0-43-lowlatency –  5.8.0-43.49~20.04.1
linux-image-generic-64k-hwe-20.04 –  5.8.0.43.49~20.04.29
linux-image-generic-hwe-20.04 –  5.8.0.43.49~20.04.29
linux-image-generic-lpae-hwe-20.04 –  5.8.0.43.49~20.04.29
linux-image-lowlatency-hwe-20.04 –  5.8.0.43.49~20.04.29
linux-image-oem-20.04 –  5.6.0.1047.43
linux-image-virtual-hwe-20.04 –  5.8.0.43.49~20.04.29

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References

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