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.
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{ "binaries": [ { "binary_version": "1:9.18.12-0ubuntu0.22.04.2", "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" } ], "availability": "No subscription required" }
{ "binaries": [ { "binary_version": "1:9.11.19+dfsg-2.1ubuntu3", "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" } ] }
{ "binaries": [ { "binary_version": "4.4.3-P1-4ubuntu2", "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" } ] }
{ "binaries": [ { "binary_version": "4.4.3-P1-4ubuntu2", "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" } ] }
{ "binaries": [ { "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm10", "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" } ], "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro" }
{ "binaries": [ { "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.19+esm6", "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" } ], "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro" }
{ "binaries": [ { "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm1", "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" } ], "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro" }
{ "binaries": [ { "binary_version": "1:9.11.16+dfsg-3~ubuntu1", "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" } ] }