A util-linux security update has been released for Ubuntu Linux 18.04 LTS.

USN-4512-1: util-linux vulnerability

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Ubuntu Security Notice USN-4512-1
September 17, 2020

util-linux vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS

Summary:

util-linux could be made to run programs when performing bash completion.

Software Description:
- util-linux: miscellaneous system utilities

Details:

It was discovered that the umount bash completion script shipped in
util-linux incorrectly handled certain mountpoints. If a local attacker
were able to create arbitrary mountpoints, another user could be tricked
into executing arbitrary code when attempting to run the umount command
with bash completion.

Update instructions:

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

Ubuntu 18.04 LTS:
util-linux 2.31.1-0.4ubuntu3.7

In general, a standard system update will make all the necessary changes.

References:
  https://usn.ubuntu.com/4512-1
CVE-2018-7738

Package Information:
  https://launchpad.net/ubuntu/+source/util-linux/2.31.1-0.4ubuntu3.7