{ "document": { "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/tuxcare9.8esu/vex/2026/cve-2026-78227-els_os-tuxcare9_8esu.json" } ], "tracking": { "current_release_date": "2026-10-19T16:51:39Z", "generator": { "date": "2026-10-19T16:51:39Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-78227-ELS_OS-TUXCARE9.8ESU", "initial_release_date": "2026-09-16T09:17:00Z", "revision_history": [ { "date": "2026-09-16T09:17:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-10-05T07:22:09Z", "number": "2", "summary": "Official Publication" }, { "date": "2026-10-12T23:21:43Z", "number": "3", "summary": "Update document" }, { "date": "2026-10-19T16:51:39Z", "number": "4", "summary": "Update document" } ], "status": "final", "version": "4" }, "title": "Security update on CVE-2026-78227" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "AlmaLinux 9.8", "product": { "name": "AlmaLinux 9.8", "product_id": "AlmaLinux-9.8", "product_identification_helper": { "cpe": "cpe:2.3:o:almalinux:almalinux:9.8:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "AlmaLinux" } ], "category": "vendor", "name": "AlmaLinux OS Foundation" }, { "branches": [ { "branches": [ { "category": "product_name", "name": "Rocky Linux 9.8", "product": { "name": "Rocky Linux 9.8", "product_id": "Rocky Linux-9.8", "product_identification_helper": { "cpe": "cpe:2.3:o:resf:rocky_linux:9.8:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "Rocky Linux" } ], "category": "vendor", "name": "Rocky Linux" }, { "branches": [ { "branches": [ { 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"unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.i686", "relates_to_product_reference": "Rocky Linux-9.8" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-78227", "cwe": { "id": "CWE-416", "name": "Use After Free" }, "notes": [ { "category": "description", "text": "NLnet Labs Unbound 1.22.0 up to and including 1.26.1, has a use-after-free vulnerability when compiled for DNS-over-QUIC support with '--with-libngtcp2'. Each DoQ stream owns an output buffer that holds the DNS response. ngtcp2's retransmission buffer keeps a shallow pointer into the output buffer for as long as a STREAM frame may be resent. On a client RESET_STREAM, the output buffer is freed but ngtcp2 still holds the matching retransmission entries. The next PTO timeout makes ngtcp2 re-encode the STREAM frame and copy from the freed buffer. A malicious actor that can query Unbound over DoQ and that withholds ACKs, sends RESET_STREAM, and waits for PTO, reaches this use-after-free with no privilege. This leads to retransmissions against freed memory and eventually an abnormal server exit under a 20-query spray.", "title": "Vulnerability description" }, { "category": "other", "text": "TuxCare has assessed that this vulnerability does not impact any currently supported TuxCare products. This evaluation may change as new information becomes available. For additional details regarding this vulnerability and affected products, refer to the provided references.", "title": "Statement" } ], "product_status": { "known_not_affected": [ "AlmaLinux-9.8:python3-unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.aarch64", "AlmaLinux-9.8:python3-unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.i686", "AlmaLinux-9.8:python3-unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.x86_64", "AlmaLinux-9.8:unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.aarch64", "AlmaLinux-9.8:unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.i686", "AlmaLinux-9.8:unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.x86_64", "AlmaLinux-9.8:unbound-devel-0:1.24.2-3.el9_8.8.tuxcare.els1.aarch64", "AlmaLinux-9.8:unbound-devel-0:1.24.2-3.el9_8.8.tuxcare.els1.i686", "AlmaLinux-9.8:unbound-devel-0:1.24.2-3.el9_8.8.tuxcare.els1.x86_64", "AlmaLinux-9.8:unbound-dracut-0:1.24.2-3.el9_8.8.tuxcare.els1.aarch64", "AlmaLinux-9.8:unbound-dracut-0:1.24.2-3.el9_8.8.tuxcare.els1.i686", 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Linux-9.8:unbound-dracut-0:1.24.2-3.el9_8.8.tuxcare.els1.i686", "Rocky Linux-9.8:unbound-dracut-0:1.24.2-3.el9_8.8.tuxcare.els1.x86_64", "Rocky Linux-9.8:unbound-libs-0:1.24.2-3.el9_8.8.tuxcare.els1.aarch64", "Rocky Linux-9.8:unbound-libs-0:1.24.2-3.el9_8.8.tuxcare.els1.i686", "Rocky Linux-9.8:unbound-libs-0:1.24.2-3.el9_8.8.tuxcare.els1.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-78227" }, { "category": "external", "summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-78227.txt", "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-78227.txt" } ], "release_date": "2026-09-16T09:17:00Z", "threats": [ { "category": "impact", "details": "Moderate" }, { "category": "impact", "date": "2026-10-19T14:07:53.766134Z", "details": "Not affected: CVE-2026-78227 requires Unbound built with DNS-over-QUIC support, which the unbound package for TuxCare 9.8 ESU does not include.", "product_ids": [ 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