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USN-4489-1: Linux kernel vulnerability

8 September 2020

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

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Releases

Packages

Details

Or Cohen discovered that the AF_PACKET implementation 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.

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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.

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Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.04
Ubuntu 18.04
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-0071-1: generic-4.15, lowlatency-4.15, aws, oem
  • LSN-0072-1: oem, generic-4.15, aws, lowlatency-5.4, generic-4.4, azure, lowlatency-4.4, gcp, generic-5.4, lowlatency-4.15

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Further reading