A OpenJDK security update has been released for Ubuntu Linux 16.04 LTS, 18.04 LTS, 20.04 LTS, and 20.10.

USN-4726-1: OpenJDK vulnerability

==========================================================================
Ubuntu Security Notice USN-4726-1
February 09, 2021

openjdk-8, openjdk-lts vulnerability
==========================================================================

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

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

OpenJDK could be made to crash if it received specially crafted
input.

Software Description:
- openjdk-8: Open Source Java implementation
- openjdk-lts: Open Source Java implementation

Details:

It was discovered that OpenJDK incorrectly handled the direct buffering of
characters. An attacker could use this issue to cause OpenJDK to crash,
resulting in a denial of service, or cause other unspecified impact.

Update instructions:

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

Ubuntu 20.10:
openjdk-11-jdk 11.0.10+9-0ubuntu1~20.10
openjdk-11-jre 11.0.10+9-0ubuntu1~20.10
openjdk-11-jre-headless 11.0.10+9-0ubuntu1~20.10
openjdk-11-jre-zero 11.0.10+9-0ubuntu1~20.10
openjdk-8-jdk 8u282-b08-0ubuntu1~20.10
openjdk-8-jre 8u282-b08-0ubuntu1~20.10
openjdk-8-jre-headless 8u282-b08-0ubuntu1~20.10
openjdk-8-jre-zero 8u282-b08-0ubuntu1~20.10

Ubuntu 20.04 LTS:
openjdk-11-jdk 11.0.10+9-0ubuntu1~20.04
openjdk-11-jre 11.0.10+9-0ubuntu1~20.04
openjdk-11-jre-headless 11.0.10+9-0ubuntu1~20.04
openjdk-11-jre-zero 11.0.10+9-0ubuntu1~20.04
openjdk-8-jdk 8u282-b08-0ubuntu1~20.04
openjdk-8-jre 8u282-b08-0ubuntu1~20.04
openjdk-8-jre-headless 8u282-b08-0ubuntu1~20.04
openjdk-8-jre-zero 8u282-b08-0ubuntu1~20.04

Ubuntu 18.04 LTS:
openjdk-11-jdk 11.0.10+9-0ubuntu1~18.04
openjdk-11-jre 11.0.10+9-0ubuntu1~18.04
openjdk-11-jre-headless 11.0.10+9-0ubuntu1~18.04
openjdk-11-jre-zero 11.0.10+9-0ubuntu1~18.04
openjdk-8-jdk 8u282-b08-0ubuntu1~18.04
openjdk-8-jre 8u282-b08-0ubuntu1~18.04
openjdk-8-jre-headless 8u282-b08-0ubuntu1~18.04
openjdk-8-jre-zero 8u282-b08-0ubuntu1~18.04

Ubuntu 16.04 LTS:
openjdk-8-jdk 8u282-b08-0ubuntu1~16.04
openjdk-8-jre 8u282-b08-0ubuntu1~16.04
openjdk-8-jre-headless 8u282-b08-0ubuntu1~16.04
openjdk-8-jre-jamvm 8u282-b08-0ubuntu1~16.04
openjdk-8-jre-zero 8u282-b08-0ubuntu1~16.04

This update uses a new upstream release, which includes additional bug
fixes. After a standard system update you need to restart any Java
applications or applets to make all the necessary changes.

References:
  https://usn.ubuntu.com/4726-1
  https://launchpad.net/bugs/1914824

Package Information:
  https://launchpad.net/ubuntu/+source/openjdk-8/8u282-b08-0ubuntu1~20.10
  https://launchpad.net/ubuntu/+source/openjdk-lts/11.0.10+9-0ubuntu1~20.10
  https://launchpad.net/ubuntu/+source/openjdk-8/8u282-b08-0ubuntu1~20.04
  https://launchpad.net/ubuntu/+source/openjdk-lts/11.0.10+9-0ubuntu1~20.04
  https://launchpad.net/ubuntu/+source/openjdk-8/8u282-b08-0ubuntu1~18.04
  https://launchpad.net/ubuntu/+source/openjdk-lts/11.0.10+9-0ubuntu1~18.04
  https://launchpad.net/ubuntu/+source/openjdk-8/8u282-b08-0ubuntu1~16.04