Details It was discovered that c-ares incorrectly handled terminating certain queries after a maximum number of attempts. An attacker could possibly use this issue to cause c-ares to crash, resulting in a denial of service. The problem can be corrected by updating your system to the following package versions: Reduce your security exposure 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.