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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{ "availability": "No subscription required", "ubuntu_priority": "medium", "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-dbgsym" }, { "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-dnsutils-dbgsym" }, { "binary_version": "1:9.18.12-0ubuntu0.22.04.2", "binary_name": "bind9-doc" }, { "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-host-dbgsym" }, { "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-libs-dbgsym" }, { "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": "bind9-utils-dbgsym" }, { "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" } ] }