{ "document": { "aggregate_severity": { "text": "Medium" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/centos6els/vex/2026/cve-2026-44608-els_os-centos6els.json" } ], "tracking": { "current_release_date": "2026-10-28T10:59:26Z", "generator": { "date": "2026-10-28T10:59:26Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-44608-ELS_OS-CENTOS6ELS", "initial_release_date": "2026-05-20T10:16:00Z", "revision_history": [ { "date": "2026-05-20T10:16:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-10-28T10:59:26Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security update on 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"CentOS-6" }, { "category": "default_component_of", "full_product_name": { "name": "unbound-0:1.4.20-29.el6_10.1.x86_64 as a component of Community Enterprise Operating System 6", "product_id": "CentOS-6:unbound-0:1.4.20-29.el6_10.1.x86_64" }, "product_reference": "unbound-0:1.4.20-29.el6_10.1.x86_64", "relates_to_product_reference": "CentOS-6" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-44608", "cwe": { "id": "CWE-413", "name": "Improper Resource Locking" }, "notes": [ { "category": "description", "text": "NLnet Labs Unbound 1.14.0 up to and including version 1.25.0 has a locking inconsistency vulnerability that when certain conditions are met (multi-threaded, RPZ XFR reload, RPZ zone with 'rpz-nsip'/'rpz-nsdname' triggers) it could result in heap use-after-free and eventual crash. An adversary can exploit the vulnerability if conditions are first met on a vulnerable Unbound, i.e., multi-threaded, an RPZ zone with 'rpz-nsip'/'rpz-nsdname' triggers and an ongoing XFR for that RPZ zone. Local RPZ files do not trigger the vulnerability. If the timing is right and an XFR happens at the same time another thread needs to read that RPZ zone, the reader may not hold the lock long enough and the thread applying the XFR may free objects that the reader is about to walk causing the use-after-free. Unbound 1.25.1 contains a patch with a fix to the locking code.", "title": "Vulnerability description" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "known_affected": [ "CentOS-6:unbound-0:1.4.20-29.el6_10.1.i686", "CentOS-6:unbound-0:1.4.20-29.el6_10.1.tuxcare.els2.i686", "CentOS-6:unbound-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64", "CentOS-6:unbound-0:1.4.20-29.el6_10.1.x86_64", "CentOS-6:unbound-devel-0:1.4.20-29.el6_10.1.i686", "CentOS-6:unbound-devel-0:1.4.20-29.el6_10.1.tuxcare.els2.i686", "CentOS-6:unbound-devel-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64", "CentOS-6:unbound-devel-0:1.4.20-29.el6_10.1.x86_64", "CentOS-6:unbound-libs-0:1.4.20-29.el6_10.1.i686", "CentOS-6:unbound-libs-0:1.4.20-29.el6_10.1.tuxcare.els2.i686", "CentOS-6:unbound-libs-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64", "CentOS-6:unbound-libs-0:1.4.20-29.el6_10.1.x86_64", "CentOS-6:unbound-python-0:1.4.20-29.el6_10.1.i686", "CentOS-6:unbound-python-0:1.4.20-29.el6_10.1.tuxcare.els2.i686", "CentOS-6:unbound-python-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64", "CentOS-6:unbound-python-0:1.4.20-29.el6_10.1.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-44608" }, { "category": "external", "summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-44608.txt", "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-44608.txt" } ], "release_date": "2026-05-20T10:16:00Z", "remediations": [ { "category": "no_fix_planned", "date": "2026-10-15T10:08:31.403815Z", "details": "This vulnerability is only reachable under a narrow, non-default setup: Unbound must be running multi-threaded and reloading an RPZ zone received via XFR that uses rpz-nsip or rpz-nsdname triggers at the exact moment another thread reads it; local RPZ files do not trigger the bug. With no confidentiality or integrity impact (DoS-only) and default Unbound configured single‑threaded (num-threads: 1), deployments not explicitly using RPZ-over‑XFR with these triggers can safely deprioritize this CVE.", "product_ids": [ "CentOS-6:unbound-0:1.4.20-29.el6_10.1.i686", "CentOS-6:unbound-0:1.4.20-29.el6_10.1.tuxcare.els2.i686", "CentOS-6:unbound-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64", "CentOS-6:unbound-0:1.4.20-29.el6_10.1.x86_64", "CentOS-6:unbound-devel-0:1.4.20-29.el6_10.1.i686", "CentOS-6:unbound-devel-0:1.4.20-29.el6_10.1.tuxcare.els2.i686", "CentOS-6:unbound-devel-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64", "CentOS-6:unbound-devel-0:1.4.20-29.el6_10.1.x86_64", "CentOS-6:unbound-libs-0:1.4.20-29.el6_10.1.i686", "CentOS-6:unbound-libs-0:1.4.20-29.el6_10.1.tuxcare.els2.i686", "CentOS-6:unbound-libs-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64", "CentOS-6:unbound-libs-0:1.4.20-29.el6_10.1.x86_64", "CentOS-6:unbound-python-0:1.4.20-29.el6_10.1.i686", "CentOS-6:unbound-python-0:1.4.20-29.el6_10.1.tuxcare.els2.i686", "CentOS-6:unbound-python-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64", "CentOS-6:unbound-python-0:1.4.20-29.el6_10.1.x86_64" ] } ], "scores": [ { "cvss_v3": { "attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1" }, "products": [ "CentOS-6:unbound-0:1.4.20-29.el6_10.1.i686", "CentOS-6:unbound-0:1.4.20-29.el6_10.1.tuxcare.els2.i686", "CentOS-6:unbound-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64", "CentOS-6:unbound-0:1.4.20-29.el6_10.1.x86_64", "CentOS-6:unbound-devel-0:1.4.20-29.el6_10.1.i686", "CentOS-6:unbound-devel-0:1.4.20-29.el6_10.1.tuxcare.els2.i686", "CentOS-6:unbound-devel-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64", "CentOS-6:unbound-devel-0:1.4.20-29.el6_10.1.x86_64", "CentOS-6:unbound-libs-0:1.4.20-29.el6_10.1.i686", "CentOS-6:unbound-libs-0:1.4.20-29.el6_10.1.tuxcare.els2.i686", "CentOS-6:unbound-libs-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64", "CentOS-6:unbound-libs-0:1.4.20-29.el6_10.1.x86_64", "CentOS-6:unbound-python-0:1.4.20-29.el6_10.1.i686", "CentOS-6:unbound-python-0:1.4.20-29.el6_10.1.tuxcare.els2.i686", "CentOS-6:unbound-python-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64", "CentOS-6:unbound-python-0:1.4.20-29.el6_10.1.x86_64" ] } ], "threats": [ { "category": "impact", "details": "Moderate" } ] } ] }