{ "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-rt is now available for Red Hat Enterprise Linux 8.\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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.\n\nSecurity Fix(es):\n\n* Kernel: NetLabel: null pointer dereference while receiving CIPSO packet with null category may cause kernel panic (CVE-2020-10711)\n\n* Kernel: kvm: nVMX: L2 guest may trick the L0 hypervisor to access sensitive L1 resources (CVE-2020-2732)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n\nBug Fix(es):\n\n* kernel-rt: update RT source tree to the latest RHEL-8.2.z source tree (BZ#1831781)", "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-2020:2171", "url": "https://access.redhat.com/errata/RHSA-2020:2171" }, { "category": "external", "summary": "https://access.redhat.com/security/updates/classification/#important", "url": "https://access.redhat.com/security/updates/classification/#important" }, { "category": "external", "summary": "1805135", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1805135" }, { "category": "external", "summary": "1825116", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1825116" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2020/rhsa-2020_2171.json" } ], "title": "Red Hat Security Advisory: kernel-rt security and bug fix update", "tracking": { "current_release_date": "2026-06-28T12:13:31+00:00", "generator": { "date": "2026-06-28T12:13:31+00:00", "engine": { "name": "Red Hat SDEngine", "version": "5.2.6" } }, "id": "RHSA-2020:2171", "initial_release_date": "2020-05-14T19:08:41+00:00", "revision_history": [ { "date": "2020-05-14T19:08:41+00:00", "number": "1", "summary": "Initial version" }, { "date": "2020-05-14T19:08:41+00:00", "number": "2", "summary": "Last updated version" }, { "date": "2026-06-28T12:13:31+00:00", "number": "3", "summary": "Last generated version" } ], "status": "final", "version": "3" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Red Hat 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In the instruction emulation, the L2 guest could trick the L0 hypervisor into accessing sensitive bits of the L1 hypervisor. An L2 guest could use this flaw to potentially access information of the L1 hypervisor.", "title": "Vulnerability description" }, { "category": "summary", "text": "Kernel: kvm: nVMX: L2 guest may trick the L0 hypervisor to access sensitive L1 resources", "title": "Vulnerability summary" }, { "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": [ "NFV-8.2.0.Z.MAIN.EUS:kernel-rt-0:4.18.0-193.1.2.rt13.53.el8_2.src", "NFV-8.2.0.Z.MAIN.EUS:kernel-rt-0:4.18.0-193.1.2.rt13.53.el8_2.x86_64", "NFV-8.2.0.Z.MAIN.EUS:kernel-rt-core-0:4.18.0-193.1.2.rt13.53.el8_2.x86_64", "NFV-8.2.0.Z.MAIN.EUS:kernel-rt-debug-0:4.18.0-193.1.2.rt13.53.el8_2.x86_64", "NFV-8.2.0.Z.MAIN.EUS:kernel-rt-debug-core-0:4.18.0-193.1.2.rt13.53.el8_2.x86_64", 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{ "system_name": "Red Hat Bugzilla ID", "text": "1825116" } ], "notes": [ { "category": "description", "text": "A NULL pointer dereference flaw was found in the Linux kernel's SELinux subsystem. This flaw occurs while importing the Commercial IP Security Option (CIPSO) protocol's category bitmap into the SELinux extensible bitmap via the' ebitmap_netlbl_import' routine. While processing the CIPSO restricted bitmap tag in the 'cipso_v4_parsetag_rbm' routine, it sets the security attribute to indicate that the category bitmap is present, even if it has not been allocated. This issue leads to a NULL pointer dereference issue while importing the same category bitmap into SELinux. This flaw allows a remote network user to crash the system kernel, resulting in a denial of service.", "title": "Vulnerability description" }, { "category": "summary", "text": "Kernel: NetLabel: null pointer dereference while receiving CIPSO packet with null category may cause kernel panic", "title": "Vulnerability summary" }, { "category": "other", "text": "This issue affects the versions of the kernel packages as shipped with the Red Hat Enterprise Linux 6 starting with the Red Hat Enterprise Linux 6.7 GA version kernel-2.6.32-573 . Prior Red Hat Enterprise Linux 6 kernel versions are not affected.", "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": [ "NFV-8.2.0.Z.MAIN.EUS:kernel-rt-0:4.18.0-193.1.2.rt13.53.el8_2.src", "NFV-8.2.0.Z.MAIN.EUS:kernel-rt-0:4.18.0-193.1.2.rt13.53.el8_2.x86_64", "NFV-8.2.0.Z.MAIN.EUS:kernel-rt-core-0:4.18.0-193.1.2.rt13.53.el8_2.x86_64", "NFV-8.2.0.Z.MAIN.EUS:kernel-rt-debug-0:4.18.0-193.1.2.rt13.53.el8_2.x86_64", "NFV-8.2.0.Z.MAIN.EUS:kernel-rt-debug-core-0:4.18.0-193.1.2.rt13.53.el8_2.x86_64", "NFV-8.2.0.Z.MAIN.EUS:kernel-rt-debug-debuginfo-0:4.18.0-193.1.2.rt13.53.el8_2.x86_64", "NFV-8.2.0.Z.MAIN.EUS:kernel-rt-debug-devel-0:4.18.0-193.1.2.rt13.53.el8_2.x86_64", 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