USN-5039-1: Linux kernel vulnerability

12 August 2021

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-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.

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