{"id":"UBUNTU-CVE-2023-2828","details":"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.","modified":"2026-05-20T16:13:33.188555850Z","published":"2023-06-21T00:00:00Z","related":["USN-6183-1","USN-6183-2"],"upstream":["CVE-2023-2828"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-2828"},{"type":"REPORT","url":"https://kb.isc.org/v1/docs/cve-2023-2828"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6183-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6183-2"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2023-2828"}],"affected":[{"package":{"name":"bind9","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/bind9?arch=source&distro=trusty%2Fesm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.9.5.dfsg-3ubuntu0.19+esm10"}]}],"versions":["1:9.9.3.dfsg.P2-4ubuntu1","1:9.9.3.dfsg.P2-4ubuntu2","1:9.9.3.dfsg.P2-4ubuntu3","1:9.9.5.dfsg-2","1:9.9.5.dfsg-3","1:9.9.5.dfsg-3ubuntu0.1","1:9.9.5.dfsg-3ubuntu0.2","1:9.9.5.dfsg-3ubuntu0.3","1:9.9.5.dfsg-3ubuntu0.4","1:9.9.5.dfsg-3ubuntu0.5","1:9.9.5.dfsg-3ubuntu0.6","1:9.9.5.dfsg-3ubuntu0.7","1:9.9.5.dfsg-3ubuntu0.8","1:9.9.5.dfsg-3ubuntu0.9","1:9.9.5.dfsg-3ubuntu0.10","1:9.9.5.dfsg-3ubuntu0.11","1:9.9.5.dfsg-3ubuntu0.12","1:9.9.5.dfsg-3ubuntu0.13","1:9.9.5.dfsg-3ubuntu0.14","1:9.9.5.dfsg-3ubuntu0.15","1:9.9.5.dfsg-3ubuntu0.16","1:9.9.5.dfsg-3ubuntu0.17","1:9.9.5.dfsg-3ubuntu0.18","1:9.9.5.dfsg-3ubuntu0.19","1:9.9.5.dfsg-3ubuntu0.19+esm1","1:9.9.5.dfsg-3ubuntu0.19+esm2","1:9.9.5.dfsg-3ubuntu0.19+esm3","1:9.9.5.dfsg-3ubuntu0.19+esm4","1:9.9.5.dfsg-3ubuntu0.19+esm5","1:9.9.5.dfsg-3ubuntu0.19+esm6","1:9.9.5.dfsg-3ubuntu0.19+esm7","1:9.9.5.dfsg-3ubuntu0.19+esm9"],"ecosystem_specific":{"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":"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 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