CVE-2017-14496: Canonical Ubuntu Linux

High severity, CVSS 7.5. EPSS: 66.3% chance of exploitation in the next 30 days.

Integer underflow in the add_pseudoheader function in dnsmasq before 2.78 , when the --add-mac, --add-cpe-id or --add-subnet option is specified, allows remote attackers to cause a denial of service via a crafted DNS request.

Affected products

• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only; version 17.04 only
• Debian Debian Linux: version 7.0 only; version 7.1 only; version 9.0 only
• Google Android: version 4.4.4 only; version 5.0.2 only; version 5.1.1 only; version 6.0 only; version 6.0.1 only; version 7.0 only; …
• Novell Leap: version 42.2 only; version 42.3 only
• Red Hat Enterprise Linux Desktop: version 7.0 only
• Red Hat Enterprise Linux Server: version 7.0 only
• Red Hat Enterprise Linux Workstation: version 7.0 only
• Thekelleys Dnsmasq: up to and including 2.77

Published 2017-10-03. Last modified 2026-06-17.