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Ubuntu Security Notice USN-7689-1
August 11, 2025

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

- Ubuntu 14.04 LTS

Summary:

Dnsmasq could be made to crash if it received specially crafted network
traffic.

Software Description:
- dnsmasq: Small caching DNS proxy and DHCP/TFTP server

Details:

Xu Mingjie discovered that Dnsmasq did not correctly handle certain memory
operations. A remote attacker could possibly use this issue to cause a
denial of service.

Update instructions:

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

Ubuntu 14.04 LTS
  dnsmasq                         2.68-1ubuntu0.2+esm3
                                  Available with Ubuntu Pro
  dnsmasq-base                    2.68-1ubuntu0.2+esm3
                                  Available with Ubuntu Pro
  dnsmasq-utils                   2.68-1ubuntu0.2+esm3
                                  Available with Ubuntu Pro

After a standard system update you need to restart dnsmasq to make
all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-7689-1
  CVE-2019-14834