Every named
instance configured to run as a recursive resolver maintains a cache database holding the responses to the queries it has recently sent to authoritative servers. The size limit for that cache database can be configured using the max-cache-size
statement in the configuration file; it defaults to 90% of the total amount of memory available on the host. When the size of the cache reaches 7/8 of the configured limit, a cache-cleaning algorithm starts to remove expired and/or least-recently used RRsets from the cache, to keep memory use below the configured limit. It has been discovered that the effectiveness of the cache-cleaning algorithm used in named
can be severely diminished by querying the resolver for specific RRsets in a certain order, effectively allowing the configured max-cache-size
limit to be significantly exceeded. This issue affects BIND 9 versions 9.11.0 through 9.16.41, 9.18.0 through 9.18.15, 9.19.0 through 9.19.13, 9.11.3-S1 through 9.16.41-S1, and 9.18.11-S1 through 9.18.15-S1.
{ "availability": "No subscription required", "binaries": [ { "binary_name": "bind9", "binary_version": "1:9.16.1-0ubuntu2.15" }, { "binary_name": "bind9-dnsutils", "binary_version": "1:9.16.1-0ubuntu2.15" }, { "binary_name": "bind9-host", "binary_version": "1:9.16.1-0ubuntu2.15" }, { "binary_name": "bind9-libs", "binary_version": "1:9.16.1-0ubuntu2.15" }, { "binary_name": "bind9-utils", "binary_version": "1:9.16.1-0ubuntu2.15" }, { "binary_name": "bind9utils", "binary_version": "1:9.16.1-0ubuntu2.15" }, { "binary_name": "dnsutils", "binary_version": "1:9.16.1-0ubuntu2.15" } ] }
{ "availability": "No subscription required", "binaries": [ { "binary_name": "bind9", "binary_version": "1:9.18.12-0ubuntu0.22.04.2" }, { "binary_name": "bind9-dev", "binary_version": "1:9.18.12-0ubuntu0.22.04.2" }, { "binary_name": "bind9-dnsutils", "binary_version": "1:9.18.12-0ubuntu0.22.04.2" }, { "binary_name": "bind9-host", "binary_version": "1:9.18.12-0ubuntu0.22.04.2" }, { "binary_name": "bind9-libs", "binary_version": "1:9.18.12-0ubuntu0.22.04.2" }, { "binary_name": "bind9-utils", "binary_version": "1:9.18.12-0ubuntu0.22.04.2" }, { "binary_name": "bind9utils", "binary_version": "1:9.18.12-0ubuntu0.22.04.2" }, { "binary_name": "dnsutils", "binary_version": "1:9.18.12-0ubuntu0.22.04.2" } ] }
{ "binaries": [ { "binary_name": "libbind-dev", "binary_version": "1:9.11.19+dfsg-2.1ubuntu3" }, { "binary_name": "libbind-export-dev", "binary_version": "1:9.11.19+dfsg-2.1ubuntu3" }, { "binary_name": "libbind9-161", "binary_version": "1:9.11.19+dfsg-2.1ubuntu3" }, { "binary_name": "libdns-export1110", "binary_version": "1:9.11.19+dfsg-2.1ubuntu3" }, { "binary_name": "libdns1110", "binary_version": "1:9.11.19+dfsg-2.1ubuntu3" }, { "binary_name": "libirs-export161", "binary_version": "1:9.11.19+dfsg-2.1ubuntu3" }, { "binary_name": "libirs161", "binary_version": "1:9.11.19+dfsg-2.1ubuntu3" }, { "binary_name": "libisc-export1105", "binary_version": "1:9.11.19+dfsg-2.1ubuntu3" }, { "binary_name": "libisc1105", "binary_version": "1:9.11.19+dfsg-2.1ubuntu3" }, { "binary_name": "libisccc-export161", "binary_version": "1:9.11.19+dfsg-2.1ubuntu3" }, { "binary_name": "libisccc161", "binary_version": "1:9.11.19+dfsg-2.1ubuntu3" }, { "binary_name": "libisccfg-export163", "binary_version": "1:9.11.19+dfsg-2.1ubuntu3" }, { "binary_name": "libisccfg163", "binary_version": "1:9.11.19+dfsg-2.1ubuntu3" }, { "binary_name": "liblwres161", "binary_version": "1:9.11.19+dfsg-2.1ubuntu3" } ] }
{ "binaries": [ { "binary_name": "isc-dhcp-client", "binary_version": "4.4.3-P1-4ubuntu2" }, { "binary_name": "isc-dhcp-client-ddns", "binary_version": "4.4.3-P1-4ubuntu2" }, { "binary_name": "isc-dhcp-common", "binary_version": "4.4.3-P1-4ubuntu2" }, { "binary_name": "isc-dhcp-dev", "binary_version": "4.4.3-P1-4ubuntu2" }, { "binary_name": "isc-dhcp-keama", "binary_version": "4.4.3-P1-4ubuntu2" }, { "binary_name": "isc-dhcp-relay", "binary_version": "4.4.3-P1-4ubuntu2" }, { "binary_name": "isc-dhcp-server", "binary_version": "4.4.3-P1-4ubuntu2" }, { "binary_name": "isc-dhcp-server-ldap", "binary_version": "4.4.3-P1-4ubuntu2" } ] }
{ "binaries": [ { "binary_name": "isc-dhcp-client", "binary_version": "4.4.3-P1-4ubuntu2" }, { "binary_name": "isc-dhcp-client-ddns", "binary_version": "4.4.3-P1-4ubuntu2" }, { "binary_name": "isc-dhcp-common", "binary_version": "4.4.3-P1-4ubuntu2" }, { "binary_name": "isc-dhcp-dev", "binary_version": "4.4.3-P1-4ubuntu2" }, { "binary_name": "isc-dhcp-keama", "binary_version": "4.4.3-P1-4ubuntu2" }, { "binary_name": "isc-dhcp-relay", "binary_version": "4.4.3-P1-4ubuntu2" }, { "binary_name": "isc-dhcp-server", "binary_version": "4.4.3-P1-4ubuntu2" }, { "binary_name": "isc-dhcp-server-ldap", "binary_version": "4.4.3-P1-4ubuntu2" } ] }
{ "binaries": [ { "binary_name": "isc-dhcp-client", "binary_version": "4.4.3-P1-4ubuntu2" }, { "binary_name": "isc-dhcp-client-ddns", "binary_version": "4.4.3-P1-4ubuntu2" }, { "binary_name": "isc-dhcp-common", "binary_version": "4.4.3-P1-4ubuntu2" }, { "binary_name": "isc-dhcp-dev", "binary_version": "4.4.3-P1-4ubuntu2" }, { "binary_name": "isc-dhcp-keama", "binary_version": "4.4.3-P1-4ubuntu2" }, { "binary_name": "isc-dhcp-relay", "binary_version": "4.4.3-P1-4ubuntu2" }, { "binary_name": "isc-dhcp-server", "binary_version": "4.4.3-P1-4ubuntu2" }, { "binary_name": "isc-dhcp-server-ldap", "binary_version": "4.4.3-P1-4ubuntu2" } ] }
{ "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro", "binaries": [ { "binary_name": "bind9", "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm10" }, { "binary_name": "bind9-host", "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm10" }, { "binary_name": "bind9utils", "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm10" }, { "binary_name": "dnsutils", "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm10" }, { "binary_name": "host", "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm10" }, { "binary_name": "libbind-dev", "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm10" }, { "binary_name": "libbind9-90", "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm10" }, { "binary_name": "libdns100", "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm10" }, { "binary_name": "libisc95", "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm10" }, { "binary_name": "libisccc90", "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm10" }, { "binary_name": "libisccfg90", "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm10" }, { "binary_name": "liblwres90", "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm10" }, { "binary_name": "lwresd", "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm10" } ] }
{ "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro", "binaries": [ { "binary_name": "bind9", "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.19+esm6" }, { "binary_name": "bind9-host", "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.19+esm6" }, { "binary_name": "bind9utils", "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.19+esm6" }, { "binary_name": "dnsutils", "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.19+esm6" }, { "binary_name": "host", "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.19+esm6" }, { "binary_name": "libbind-dev", "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.19+esm6" }, { "binary_name": "libbind-export-dev", "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.19+esm6" }, { "binary_name": "libbind9-140", "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.19+esm6" }, { "binary_name": "libdns-export162", "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.19+esm6" }, { "binary_name": "libdns162", "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.19+esm6" }, { "binary_name": "libirs-export141", "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.19+esm6" }, { "binary_name": "libirs141", "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.19+esm6" }, { "binary_name": "libisc-export160", "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.19+esm6" }, { "binary_name": "libisc160", "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.19+esm6" }, { "binary_name": "libisccc-export140", "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.19+esm6" }, { "binary_name": "libisccc140", "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.19+esm6" }, { "binary_name": "libisccfg-export140", "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.19+esm6" }, { "binary_name": "libisccfg140", "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.19+esm6" }, { "binary_name": "liblwres141", "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.19+esm6" }, { "binary_name": "lwresd", "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.19+esm6" } ] }
{ "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro", "binaries": [ { "binary_name": "bind9", "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm1" }, { "binary_name": "bind9-host", "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm1" }, { "binary_name": "bind9utils", "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm1" }, { "binary_name": "dnsutils", "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm1" }, { "binary_name": "libbind-dev", "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm1" }, { "binary_name": "libbind-export-dev", "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm1" }, { "binary_name": "libbind9-160", "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm1" }, { "binary_name": "libdns-export1100", "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm1" }, { "binary_name": "libdns1100", "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm1" }, { "binary_name": "libirs-export160", "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm1" }, { "binary_name": "libirs160", "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm1" }, { "binary_name": "libisc-export169", "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm1" }, { "binary_name": "libisc169", "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm1" }, { "binary_name": "libisccc-export160", "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm1" }, { "binary_name": "libisccc160", "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm1" }, { "binary_name": "libisccfg-export160", "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm1" }, { "binary_name": "libisccfg160", "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm1" }, { "binary_name": "liblwres160", "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm1" } ] }
{ "binaries": [ { "binary_name": "libbind-dev", "binary_version": "1:9.11.16+dfsg-3~ubuntu1" }, { "binary_name": "libbind-export-dev", "binary_version": "1:9.11.16+dfsg-3~ubuntu1" }, { "binary_name": "libbind9-161", "binary_version": "1:9.11.16+dfsg-3~ubuntu1" }, { "binary_name": "libdns-export1109", "binary_version": "1:9.11.16+dfsg-3~ubuntu1" }, { "binary_name": "libdns1109", "binary_version": "1:9.11.16+dfsg-3~ubuntu1" }, { "binary_name": "libirs-export161", "binary_version": "1:9.11.16+dfsg-3~ubuntu1" }, { "binary_name": "libirs161", "binary_version": "1:9.11.16+dfsg-3~ubuntu1" }, { "binary_name": "libisc-export1105", "binary_version": "1:9.11.16+dfsg-3~ubuntu1" }, { "binary_name": "libisc1105", "binary_version": "1:9.11.16+dfsg-3~ubuntu1" }, { "binary_name": "libisccc-export161", "binary_version": "1:9.11.16+dfsg-3~ubuntu1" }, { "binary_name": "libisccc161", "binary_version": "1:9.11.16+dfsg-3~ubuntu1" }, { "binary_name": "libisccfg-export163", "binary_version": "1:9.11.16+dfsg-3~ubuntu1" }, { "binary_name": "libisccfg163", "binary_version": "1:9.11.16+dfsg-3~ubuntu1" }, { "binary_name": "liblwres161", "binary_version": "1:9.11.16+dfsg-3~ubuntu1" } ] }