A BlueZ security update has been released for Ubuntu Linux 18.04 LTS.

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Ubuntu Security Notice USN-5183-1
December 08, 2021

bluez vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS

Summary:

BlueZ could be made to crash or run programs if it received specially
crafted traffic.

Software Description:
- bluez: Bluetooth tools and daemons

Details:

Julian Rauchberger discovered that BlueZ incorrectly handled memory when
processing SDP attribute requests. A remote attacker could use this issue
to cause BlueZ to crash, leading to a denial of service, or possibly
execute arbitrary code.

Update instructions:

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

Ubuntu 18.04 LTS:
bluez 5.48-0ubuntu3.7
libbluetooth3 5.48-0ubuntu3.7

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

References:
  https://ubuntu.com/security/notices/USN-5183-1
CVE-2019-8922

Package Information:
  https://launchpad.net/ubuntu/+source/bluez/5.48-0ubuntu3.7