{ "document": { "aggregate_severity": { "namespace": "https://access.redhat.com/security/updates/classification/", "text": "Important" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "Copyright © Red Hat, Inc. All rights reserved.", "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 Red Hat Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://access.redhat.com/security/team/contact/", "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.", "name": "Red Hat Product Security", "namespace": "https://www.redhat.com" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5172.json" } ], "title": "dnsmasq: extract_addresses() OOB read via malformed rdlen", "tracking": { "current_release_date": "2026-06-28T07:43:27+00:00", "generator": { "date": "2026-06-28T07:43:27+00:00", "engine": { "name": "Red Hat SDEngine", "version": "5.2.6" } }, "id": "CVE-2026-5172", "initial_release_date": "2026-05-09T00:00:00+00:00", "revision_history": [ { 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"red_hat_enterprise_linux_8" }, { "category": "default_component_of", "full_product_name": { "name": "dnsmasq-utils as a component of Red Hat Enterprise Linux 8", "product_id": "red_hat_enterprise_linux_8:dnsmasq-utils" }, "product_reference": "dnsmasq-utils", "relates_to_product_reference": "red_hat_enterprise_linux_8" }, { "category": "default_component_of", "full_product_name": { "name": "dnsmasq.src as a component of Red Hat Enterprise Linux 8", "product_id": "red_hat_enterprise_linux_8:dnsmasq.src" }, "product_reference": "dnsmasq.src", "relates_to_product_reference": "red_hat_enterprise_linux_8" }, { "category": "default_component_of", "full_product_name": { "name": "dnsmasq as a component of Red Hat Enterprise Linux 9", "product_id": "red_hat_enterprise_linux_9:dnsmasq" }, "product_reference": "dnsmasq", "relates_to_product_reference": "red_hat_enterprise_linux_9" }, { "category": "default_component_of", "full_product_name": { "name": "dnsmasq-utils as a component of Red Hat Enterprise Linux 9", "product_id": "red_hat_enterprise_linux_9:dnsmasq-utils" }, "product_reference": "dnsmasq-utils", "relates_to_product_reference": "red_hat_enterprise_linux_9" }, { "category": "default_component_of", "full_product_name": { "name": "dnsmasq.src as a component of Red Hat Enterprise Linux 9", "product_id": "red_hat_enterprise_linux_9:dnsmasq.src" }, "product_reference": "dnsmasq.src", "relates_to_product_reference": "red_hat_enterprise_linux_9" }, { "category": "default_component_of", "full_product_name": { "name": "rhcos as a component of Red Hat OpenShift Container Platform 4", "product_id": "red_hat_openshift_container_platform_4:rhcos" }, "product_reference": "rhcos", "relates_to_product_reference": "red_hat_openshift_container_platform_4" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-5172", "cwe": { "id": "CWE-125", "name": "Out-of-bounds Read" }, "discovery_date": "2026-04-14T22:55:28.042000+00:00", "flags": [ { "label": "vulnerable_code_not_present", "product_ids": [ "red_hat_enterprise_linux_7:dnsmasq", "red_hat_enterprise_linux_7:dnsmasq-utils", "red_hat_enterprise_linux_7:dnsmasq.src" ] }, { "label": "component_not_present", "product_ids": [ "red_hat_openshift_container_platform_4:rhcos" ] } ], "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2458521" } ], "notes": [ { "category": "description", "text": "A heap out-of-bounds read vulnerability was discovered in dnsmasq's DNS response processing. The extract_addresses() function trusts the declared record data length (rdlen) without verifying that a subsequent call to extract_name() stays within the record boundary. A crafted DNS response with a mismatched rdlen causes the remaining-bytes calculation to underflow, resulting in a massive out-of-bounds read and process crash.", "title": "Vulnerability description" }, { "category": "summary", "text": "dnsmasq: extract_addresses() OOB read via malformed rdlen", "title": "Vulnerability summary" }, { "category": "other", "text": "Red Hat rates this as Important. While this bug does not require any special dnsmasq configuration, the impact is limited to denial of service.", "title": "Statement" }, { "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": { "fixed": [ "AppStream-10.2.Z:dnsmasq-0:2.90-7.el10_2.aarch64", "AppStream-10.2.Z:dnsmasq-0:2.90-7.el10_2.ppc64le", "AppStream-10.2.Z:dnsmasq-0:2.90-7.el10_2.s390x", "AppStream-10.2.Z:dnsmasq-0:2.90-7.el10_2.src", "AppStream-10.2.Z:dnsmasq-0:2.90-7.el10_2.x86_64", "AppStream-10.2.Z:dnsmasq-debuginfo-0:2.90-7.el10_2.aarch64", "AppStream-10.2.Z:dnsmasq-debuginfo-0:2.90-7.el10_2.ppc64le", "AppStream-10.2.Z:dnsmasq-debuginfo-0:2.90-7.el10_2.s390x", "AppStream-10.2.Z:dnsmasq-debuginfo-0:2.90-7.el10_2.x86_64", "AppStream-10.2.Z:dnsmasq-debugsource-0:2.90-7.el10_2.aarch64", "AppStream-10.2.Z:dnsmasq-debugsource-0:2.90-7.el10_2.ppc64le", "AppStream-10.2.Z:dnsmasq-debugsource-0:2.90-7.el10_2.s390x", "AppStream-10.2.Z:dnsmasq-debugsource-0:2.90-7.el10_2.x86_64", "AppStream-10.2.Z:dnsmasq-utils-0:2.90-7.el10_2.aarch64", "AppStream-10.2.Z:dnsmasq-utils-0:2.90-7.el10_2.ppc64le", "AppStream-10.2.Z:dnsmasq-utils-0:2.90-7.el10_2.s390x", "AppStream-10.2.Z:dnsmasq-utils-0:2.90-7.el10_2.x86_64", "AppStream-10.2.Z:dnsmasq-utils-debuginfo-0:2.90-7.el10_2.aarch64", "AppStream-10.2.Z:dnsmasq-utils-debuginfo-0:2.90-7.el10_2.ppc64le", "AppStream-10.2.Z:dnsmasq-utils-debuginfo-0:2.90-7.el10_2.s390x", "AppStream-10.2.Z:dnsmasq-utils-debuginfo-0:2.90-7.el10_2.x86_64" ], "known_affected": [ "red_hat_enterprise_linux_6:dnsmasq", "red_hat_enterprise_linux_6:dnsmasq-utils", "red_hat_enterprise_linux_6:dnsmasq.src", "red_hat_enterprise_linux_8:dnsmasq", "red_hat_enterprise_linux_8:dnsmasq-utils", "red_hat_enterprise_linux_8:dnsmasq.src", "red_hat_enterprise_linux_9:dnsmasq", "red_hat_enterprise_linux_9:dnsmasq-utils", "red_hat_enterprise_linux_9:dnsmasq.src" ], "known_not_affected": [ "red_hat_enterprise_linux_7:dnsmasq", "red_hat_enterprise_linux_7:dnsmasq-utils", "red_hat_enterprise_linux_7:dnsmasq.src", "red_hat_openshift_container_platform_4:rhcos" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://access.redhat.com/security/cve/CVE-2026-5172" }, { "category": "external", "summary": "RHBZ#2458521", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2458521" }, { "category": "external", "summary": "https://www.cve.org/CVERecord?id=CVE-2026-5172", "url": "https://www.cve.org/CVERecord?id=CVE-2026-5172" }, { "category": "external", "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-5172", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5172" }, { "category": "external", "summary": "https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html", "url": "https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html" } ], "release_date": "2026-05-09T00:00:00+00:00", "remediations": [ { "category": "vendor_fix", "date": "2026-05-19T16:15:41+00:00", "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258", "product_ids": [ "AppStream-10.2.Z:dnsmasq-0:2.90-7.el10_2.aarch64", "AppStream-10.2.Z:dnsmasq-0:2.90-7.el10_2.ppc64le", "AppStream-10.2.Z:dnsmasq-0:2.90-7.el10_2.s390x", "AppStream-10.2.Z:dnsmasq-0:2.90-7.el10_2.src", "AppStream-10.2.Z:dnsmasq-0:2.90-7.el10_2.x86_64", "AppStream-10.2.Z:dnsmasq-debuginfo-0:2.90-7.el10_2.aarch64", "AppStream-10.2.Z:dnsmasq-debuginfo-0:2.90-7.el10_2.ppc64le", "AppStream-10.2.Z:dnsmasq-debuginfo-0:2.90-7.el10_2.s390x", "AppStream-10.2.Z:dnsmasq-debuginfo-0:2.90-7.el10_2.x86_64", "AppStream-10.2.Z:dnsmasq-debugsource-0:2.90-7.el10_2.aarch64", "AppStream-10.2.Z:dnsmasq-debugsource-0:2.90-7.el10_2.ppc64le", "AppStream-10.2.Z:dnsmasq-debugsource-0:2.90-7.el10_2.s390x", "AppStream-10.2.Z:dnsmasq-debugsource-0:2.90-7.el10_2.x86_64", "AppStream-10.2.Z:dnsmasq-utils-0:2.90-7.el10_2.aarch64", "AppStream-10.2.Z:dnsmasq-utils-0:2.90-7.el10_2.ppc64le", "AppStream-10.2.Z:dnsmasq-utils-0:2.90-7.el10_2.s390x", "AppStream-10.2.Z:dnsmasq-utils-0:2.90-7.el10_2.x86_64", "AppStream-10.2.Z:dnsmasq-utils-debuginfo-0:2.90-7.el10_2.aarch64", "AppStream-10.2.Z:dnsmasq-utils-debuginfo-0:2.90-7.el10_2.ppc64le", "AppStream-10.2.Z:dnsmasq-utils-debuginfo-0:2.90-7.el10_2.s390x", "AppStream-10.2.Z:dnsmasq-utils-debuginfo-0:2.90-7.el10_2.x86_64" ], "url": "https://access.redhat.com/errata/RHSA-2026:19158" }, { "category": "no_fix_planned", "details": "Out of support scope", "product_ids": [ "red_hat_enterprise_linux_6:dnsmasq", "red_hat_enterprise_linux_6:dnsmasq-utils", "red_hat_enterprise_linux_6:dnsmasq.src" ] }, { "category": "no_fix_planned", "details": "Will not fix", "product_ids": [ "red_hat_enterprise_linux_8:dnsmasq", "red_hat_enterprise_linux_8:dnsmasq-utils", "red_hat_enterprise_linux_8:dnsmasq.src", "red_hat_enterprise_linux_9:dnsmasq", "red_hat_enterprise_linux_9:dnsmasq-utils", "red_hat_enterprise_linux_9:dnsmasq.src" ] } ], "scores": [ { "cvss_v3": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1" }, "products": [ "AppStream-10.2.Z:dnsmasq-0:2.90-7.el10_2.aarch64", "AppStream-10.2.Z:dnsmasq-0:2.90-7.el10_2.ppc64le", "AppStream-10.2.Z:dnsmasq-0:2.90-7.el10_2.s390x", "AppStream-10.2.Z:dnsmasq-0:2.90-7.el10_2.src", 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"red_hat_enterprise_linux_6:dnsmasq", "red_hat_enterprise_linux_6:dnsmasq-utils", "red_hat_enterprise_linux_6:dnsmasq.src", "red_hat_enterprise_linux_7:dnsmasq", "red_hat_enterprise_linux_7:dnsmasq-utils", "red_hat_enterprise_linux_7:dnsmasq.src", "red_hat_enterprise_linux_8:dnsmasq", "red_hat_enterprise_linux_8:dnsmasq-utils", "red_hat_enterprise_linux_8:dnsmasq.src", "red_hat_enterprise_linux_9:dnsmasq", "red_hat_enterprise_linux_9:dnsmasq-utils", "red_hat_enterprise_linux_9:dnsmasq.src", "red_hat_openshift_container_platform_4:rhcos" ] } ], "title": "dnsmasq: extract_addresses() OOB read via malformed rdlen" } ] }