{ "document": { "aggregate_severity": { "namespace": "https://access.redhat.com/security/updates/classification/", "text": "Important" }, "category": "csaf_security_advisory", "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": "summary", "text": "An update for kernel is now available for Red Hat Enterprise Linux 5 Extended Lifecycle Support.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.", "title": "Topic" }, { "category": "general", "text": "The kernel packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n\n* An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of Load & Store instructions (a commonly used performance optimization). It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory read from address to which a recent memory write has occurred may see an older value and subsequently cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to read privileged memory by conducting targeted cache side-channel attacks. (CVE-2018-3639)\n\n* kernel: A divide-by-zero vulnerability was found in the __tcp_select_window function in the Linux kernel. This can result in a kernel panic causing a local denial of service. (CVE-2017-14106)\n\nFor more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.\n\nRed Hat would like to thank Ken Johnson (Microsoft Security Response Center) and Jann Horn (Google Project Zero) for reporting CVE-2018-3639.", "title": "Details" }, { "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": "https://access.redhat.com/errata/RHSA-2018:2172", "url": "https://access.redhat.com/errata/RHSA-2018:2172" }, { "category": "external", "summary": "https://access.redhat.com/security/updates/classification/#important", "url": "https://access.redhat.com/security/updates/classification/#important" }, { "category": "external", "summary": "https://access.redhat.com/security/vulnerabilities/ssbd", "url": "https://access.redhat.com/security/vulnerabilities/ssbd" }, { "category": "external", "summary": "1487295", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1487295" }, { "category": "external", "summary": "1566890", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1566890" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2018/rhsa-2018_2172.json" } ], "title": "Red Hat Security Advisory: kernel security update", "tracking": { "current_release_date": "2026-06-28T12:12:03+00:00", "generator": { "date": "2026-06-28T12:12:03+00:00", "engine": { "name": "Red Hat SDEngine", "version": "5.2.6" } }, "id": "RHSA-2018:2172", "initial_release_date": "2018-07-11T15:39:56+00:00", "revision_history": [ { "date": "2018-07-11T15:39:56+00:00", "number": "1", "summary": "Initial version" }, { "date": "2018-07-11T15:39:56+00:00", "number": "2", "summary": "Last updated version" }, { "date": "2026-06-28T12:12:03+00:00", 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the Linux kernel. This can result in a kernel panic causing a local denial of service.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: Divide-by-zero in __tcp_select_window", "title": "Vulnerability summary" }, { "category": "other", "text": "This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6 and 7 and MRG-2. Future Linux kernel updates for the respective releases may address this issue.", "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": [ "5Server-ELS:kernel-0:2.6.18-433.el5.i686", "5Server-ELS:kernel-0:2.6.18-433.el5.s390x", "5Server-ELS:kernel-0:2.6.18-433.el5.src", "5Server-ELS:kernel-0:2.6.18-433.el5.x86_64", "5Server-ELS:kernel-PAE-0:2.6.18-433.el5.i686", "5Server-ELS:kernel-PAE-debuginfo-0:2.6.18-433.el5.i686", "5Server-ELS:kernel-PAE-devel-0:2.6.18-433.el5.i686", "5Server-ELS:kernel-debug-0:2.6.18-433.el5.i686", "5Server-ELS:kernel-debug-0:2.6.18-433.el5.s390x", "5Server-ELS:kernel-debug-0:2.6.18-433.el5.x86_64", "5Server-ELS:kernel-debug-debuginfo-0:2.6.18-433.el5.i686", 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It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory read from address to which a recent memory write has occurred may see an older value and subsequently cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to read privileged memory by conducting targeted cache side-channel attacks.", "title": "Vulnerability description" }, { "category": "summary", "text": "hw: cpu: speculative store bypass", "title": "Vulnerability summary" }, { "category": "other", "text": "Red Hat Product Security is aware of this issue. Updates will be released as they become available. For additional information, please refer to the Red Hat Knowledgebase article: https://access.redhat.com/security/vulnerabilities/ssbd", "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": [ "5Server-ELS:kernel-0:2.6.18-433.el5.i686", "5Server-ELS:kernel-0:2.6.18-433.el5.s390x", "5Server-ELS:kernel-0:2.6.18-433.el5.src", "5Server-ELS:kernel-0:2.6.18-433.el5.x86_64", "5Server-ELS:kernel-PAE-0:2.6.18-433.el5.i686", "5Server-ELS:kernel-PAE-debuginfo-0:2.6.18-433.el5.i686", "5Server-ELS:kernel-PAE-devel-0:2.6.18-433.el5.i686", "5Server-ELS:kernel-debug-0:2.6.18-433.el5.i686", "5Server-ELS:kernel-debug-0:2.6.18-433.el5.s390x", "5Server-ELS:kernel-debug-0:2.6.18-433.el5.x86_64", 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