{"id":"CLSA-2026-1788000191","summary":"Fix CVE(s): CVE-2023-6516","details":"   * SECURITY UPDATE: unbounded growth of the asynchronous RBT cache-cleanup\n     queue lets max-cache-size be exceeded\n     - debian/patches/CVE-2023-6516.patch: limit isc_task_send() overhead\n       for tree pruning (upstream c3377cbfaa).\n     - debian/patches/CVE-2023-6516-lock-contention.patch: reduce lock\n       contention during RBTDB tree pruning (upstream 801e888d03).\n     - debian/patches/CVE-2023-6516-prune-guards.patch: guard re-queueing a\n       node for pruning (upstream f6289ad931, 4b6fc97af6, 7d9be24bb1).\n     - debian/patches/CVE-2023-6516-final-design.patch: the design upstream\n       settled on in 9.16.49, GL #4621 (upstream a548312191, eba7fb5f9f,\n       5f98eba608).  Drops the prunenodes lists, so dns_rbtnode is\n       unchanged and MAPAPI stays at 1.0.\n     - CVE-2023-6516","modified":"2026-10-26T09:32:03.775864419Z","published":"2026-08-29T10:48:19Z","upstream":["CVE-2023-6516"],"references":[{"type":"ADVISORY","url":"https://errata.tuxcare.com/els_os/ubuntu18.04els/CLSA-2026-1788000191.html"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-6516"}],"affected":[{"package":{"name":"bind9","ecosystem":"TuxCare:Ubuntu:18.04","purl":"pkg:deb/tuxcare/bind9?distro=ubuntu-18.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.11.3+dfsg-1ubuntu1.18+tuxcare.els11"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1788000191.json"}},{"package":{"name":"bind9-doc","ecosystem":"TuxCare:Ubuntu:18.04","purl":"pkg:deb/tuxcare/bind9-doc?distro=ubuntu-18.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.11.3+dfsg-1ubuntu1.18+tuxcare.els11"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1788000191.json"}},{"package":{"name":"bind9-host","ecosystem":"TuxCare:Ubuntu:18.04","purl":"pkg:deb/tuxcare/bind9-host?distro=ubuntu-18.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.11.3+dfsg-1ubuntu1.18+tuxcare.els11"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1788000191.json"}},{"package":{"name":"bind9utils","ecosystem":"TuxCare:Ubuntu:18.04","purl":"pkg:deb/tuxcare/bind9utils?distro=ubuntu-18.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.11.3+dfsg-1ubuntu1.18+tuxcare.els11"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1788000191.json"}},{"package":{"name":"dnsutils","ecosystem":"TuxCare:Ubuntu:18.04","purl":"pkg:deb/tuxcare/dnsutils?distro=ubuntu-18.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.11.3+dfsg-1ubuntu1.18+tuxcare.els11"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1788000191.json"}},{"package":{"name":"libbind-dev","ecosystem":"TuxCare:Ubuntu:18.04","purl":"pkg:deb/tuxcare/libbind-dev?distro=ubuntu-18.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.11.3+dfsg-1ubuntu1.18+tuxcare.els11"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1788000191.json"}},{"package":{"name":"libbind-export-dev","ecosystem":"TuxCare:Ubuntu:18.04","purl":"pkg:deb/tuxcare/libbind-export-dev?distro=ubuntu-18.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.11.3+dfsg-1ubuntu1.18+tuxcare.els11"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1788000191.json"}},{"package":{"name":"libbind9-160","ecosystem":"TuxCare:Ubuntu:18.04","purl":"pkg:deb/tuxcare/libbind9-160?distro=ubuntu-18.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.11.3+dfsg-1ubuntu1.18+tuxcare.els11"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1788000191.json"}},{"package":{"name":"libdns-export1100","ecosystem":"TuxCare:Ubuntu:18.04","purl":"pkg:deb/tuxcare/libdns-export1100?distro=ubuntu-18.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.11.3+dfsg-1ubuntu1.18+tuxcare.els11"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1788000191.json"}},{"package":{"name":"libdns1100","ecosystem":"TuxCare:Ubuntu:18.04","purl":"pkg:deb/tuxcare/libdns1100?distro=ubuntu-18.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.11.3+dfsg-1ubuntu1.18+tuxcare.els11"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1788000191.json"}},{"package":{"name":"libirs-export160","ecosystem":"TuxCare:Ubuntu:18.04","purl":"pkg:deb/tuxcare/libirs-export160?distro=ubuntu-18.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.11.3+dfsg-1ubuntu1.18+tuxcare.els11"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1788000191.json"}},{"package":{"name":"libirs160","ecosystem":"TuxCare:Ubuntu:18.04","purl":"pkg:deb/tuxcare/libirs160?distro=ubuntu-18.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.11.3+dfsg-1ubuntu1.18+tuxcare.els11"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1788000191.json"}},{"package":{"name":"libisc-export169","ecosystem":"TuxCare:Ubuntu:18.04","purl":"pkg:deb/tuxcare/libisc-export169?dist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