Your submission was sent successfully! Close

You have successfully unsubscribed! Close

USN-5039-1: Linux kernel vulnerability

12 August 2021

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

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-kvm - Linux kernel for cloud environments
  • linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty

Details

Andy Nguyen discovered that the netfilter subsystem in the Linux kernel
contained an out-of-bounds write in its setsockopt() implementation. A
local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code.

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 16.04
Ubuntu 14.04

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.

References

Related notices

  • LSN-0080-1: generic-5.4, lowlatency-4.4, gkeop, gke-5.4, gke, gke-4.15, gkeop-5.4, lowlatency-4.15, generic-4.15, lowlatency-5.4, generic-4.4, oem, gcp
  • LSN-0081-1: generic-5.4, lowlatency-4.4, gkeop, gke-5.4, gke, gke-4.15, gkeop-5.4, lowlatency-4.15, generic-4.15, lowlatency-5.4, generic-4.4, oem, gcp
  • LSN-0083-1: generic-5.4, lowlatency-4.4, gkeop, gke-5.4, aws, gke, gke-4.15, gkeop-5.4, lowlatency-4.15, generic-4.15, lowlatency-5.4, generic-4.4, oem, azure, gcp