{"id":"USN-6034-1","summary":"dnsmasq vulnerability","details":"It was discovered that Dnsmasq was sending large DNS messages\nover UDP, possibly causing transmission failures due to IP\nfragmentation. This update lowers the default maximum size of\nDNS messages to improve transmission reliability over UDP.\n","modified":"2026-02-10T04:43:06Z","published":"2023-04-20T12:57:33Z","related":["UBUNTU-CVE-2023-28450"],"upstream":["CVE-2023-28450","UBUNTU-CVE-2023-28450"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6034-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-28450"}],"affected":[{"package":{"name":"dnsmasq","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/dnsmasq@2.68-1ubuntu0.2+esm2?arch=source&distro=trusty/esm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.68-1ubuntu0.2+esm2"}]}],"versions":["2.66-4ubuntu1","2.67-1","2.68-1","2.68-1ubuntu0.1","2.68-1ubuntu0.2","2.68-1ubuntu0.2+esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"2.68-1ubuntu0.2+esm2","binary_name":"dnsmasq"},{"binary_version":"2.68-1ubuntu0.2+esm2","binary_name":"dnsmasq-base"},{"binary_version":"2.68-1ubuntu0.2+esm2","binary_name":"dnsmasq-utils"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6034-1.json","cves_map":{"cves":[{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}],"id":"CVE-2023-28450"}],"ecosystem":"Ubuntu:Pro:14.04:LTS"}}},{"package":{"name":"dnsmasq","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/dnsmasq@2.79-1ubuntu0.16.04.1+esm2?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.79-1ubuntu0.16.04.1+esm2"}]}],"versions":["2.75-1","2.75-1ubuntu0.16.04.1","2.75-1ubuntu0.16.04.2","2.75-1ubuntu0.16.04.3","2.75-1ubuntu0.16.04.4","2.75-1ubuntu0.16.04.5","2.75-1ubuntu0.16.04.7","2.75-1ubuntu0.16.04.8","2.75-1ubuntu0.16.04.10","2.75-1ubuntu0.16.04.10+esm1","2.79-1ubuntu0.16.04.1+esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"2.79-1ubuntu0.16.04.1+esm2","binary_name":"dnsmasq"},{"binary_version":"2.79-1ubuntu0.16.04.1+esm2","binary_name":"dnsmasq-base"},{"binary_version":"2.79-1ubuntu0.16.04.1+esm2","binary_name":"dnsmasq-base-lua"},{"binary_version":"2.79-1ubuntu0.16.04.1+esm2","binary_name":"dnsmasq-utils"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6034-1.json","cves_map":{"cves":[{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}],"id":"CVE-2023-28450"}],"ecosystem":"Ubuntu:Pro:16.04:LTS"}}},{"package":{"name":"dnsmasq","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/dnsmasq@2.79-1ubuntu0.7?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.79-1ubuntu0.7"}]}],"versions":["2.78-1","2.78-3","2.79-1","2.79-1ubuntu0.2","2.79-1ubuntu0.3","2.79-1ubuntu0.4","2.79-1ubuntu0.5","2.79-1ubuntu0.6"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"2.79-1ubuntu0.7","binary_name":"dnsmasq"},{"binary_version":"2.79-1ubuntu0.7","binary_name":"dnsmasq-base"},{"binary_version":"2.79-1ubuntu0.7","binary_name":"dnsmasq-base-lua"},{"binary_version":"2.79-1ubuntu0.7","binary_name":"dnsmasq-utils"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6034-1.json","cves_map":{"cves":[{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}],"id":"CVE-2023-28450"}],"ecosystem":"Ubuntu:18.04:LTS"}}},{"package":{"name":"dnsmasq","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/dnsmasq@2.80-1.1ubuntu1.7?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.80-1.1ubuntu1.7"}]}],"versions":["2.80-1ubuntu2","2.80-1ubuntu4","2.80-1.1ubuntu1","2.80-1.1ubuntu1.2","2.80-1.1ubuntu1.3","2.80-1.1ubuntu1.4","2.80-1.1ubuntu1.5","2.80-1.1ubuntu1.6"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"2.80-1.1ubuntu1.7","binary_name":"dnsmasq"},{"binary_version":"2.80-1.1ubuntu1.7","binary_name":"dnsmasq-base"},{"binary_version":"2.80-1.1ubuntu1.7","binary_name":"dnsmasq-base-lua"},{"binary_version":"2.80-1.1ubuntu1.7","binary_name":"dnsmasq-utils"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6034-1.json","cves_map":{"cves":[{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}],"id":"CVE-2023-28450"}],"ecosystem":"Ubuntu:20.04:LTS"}}},{"package":{"name":"dnsmasq","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/dnsmasq@2.86-1.1ubuntu0.3?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.86-1.1ubuntu0.3"}]}],"versions":["2.85-1ubuntu2","2.86-1.1","2.86-1.1ubuntu0.1","2.86-1.1ubuntu0.2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"2.86-1.1ubuntu0.3","binary_name":"dnsmasq"},{"binary_version":"2.86-1.1ubuntu0.3","binary_name":"dnsmasq-base"},{"binary_version":"2.86-1.1ubuntu0.3","binary_name":"dnsmasq-base-lua"},{"binary_version":"2.86-1.1ubuntu0.3","binary_name":"dnsmasq-utils"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6034-1.json","cves_map":{"cves":[{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}],"id":"CVE-2023-28450"}],"ecosystem":"Ubuntu:22.04:LTS"}}}],"schema_version":"1.7.3"}