{ "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 8.2 Extended Update 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-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: Use after free via PI futex state (CVE-2021-3347)\n\n* kernel: out-of-bounds read in libiscsi module (CVE-2021-27364)\n\n* kernel: heap buffer overflow in the iSCSI subsystem (CVE-2021-27365)\n\n* kernel: iscsi: unrestricted access to sessions and handles (CVE-2021-27363)\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.z8 Batch source tree (BZ#1916765)", "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-2021:1279", "url": "https://access.redhat.com/errata/RHSA-2021:1279" }, { "category": "external", "summary": "https://access.redhat.com/security/updates/classification/#important", "url": "https://access.redhat.com/security/updates/classification/#important" }, { "category": "external", "summary": "1922249", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1922249" }, { "category": "external", "summary": "1930078", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1930078" }, { "category": "external", "summary": "1930079", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1930079" }, { "category": "external", "summary": "1930080", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1930080" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_1279.json" } ], "title": "Red Hat Security Advisory: kernel-rt security and bug fix update", "tracking": { "current_release_date": "2026-06-28T12:34:19+00:00", "generator": { "date": "2026-06-28T12:34:19+00:00", "engine": { "name": "Red Hat SDEngine", "version": "5.2.6" } }, "id": "RHSA-2021:1279", "initial_release_date": "2021-04-20T13:06:49+00:00", "revision_history": [ { "date": "2021-04-20T13:06:49+00:00", "number": "1", "summary": "Initial version" }, { "date": "2021-04-20T13:06:49+00:00", "number": "2", "summary": "Last updated version" }, { "date": 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"text": "1922249" } ], "notes": [ { "category": "description", "text": "A flaw was found in the Linux kernel. A use-after-free memory flaw in the Fast Userspace Mutexes functionality allowing a local user to crash the system or escalate their privileges on the system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: Use after free via PI futex state", "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.EUS:kernel-rt-0:4.18.0-193.51.1.rt13.101.el8_2.src", "NFV-8.2.0.Z.EUS:kernel-rt-0:4.18.0-193.51.1.rt13.101.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-core-0:4.18.0-193.51.1.rt13.101.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-0:4.18.0-193.51.1.rt13.101.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-core-0:4.18.0-193.51.1.rt13.101.el8_2.x86_64", 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Linux kernel. A local user could use this flaw to leak iSCSI transport handle kernel address or end arbitrary iSCSI connections on the system.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: iscsi: unrestricted access to sessions and handles", "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.EUS:kernel-rt-0:4.18.0-193.51.1.rt13.101.el8_2.src", "NFV-8.2.0.Z.EUS:kernel-rt-0:4.18.0-193.51.1.rt13.101.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-core-0:4.18.0-193.51.1.rt13.101.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-0:4.18.0-193.51.1.rt13.101.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-core-0:4.18.0-193.51.1.rt13.101.el8_2.x86_64", 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"id": "CWE-125", "name": "Out-of-bounds Read" }, "discovery_date": "2021-02-18T00:00:00+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "1930080" } ], "notes": [ { "category": "description", "text": "A flaw was found in the Linux kernel. An out-of-bounds read was discovered in the libiscsi module that could lead to reading kernel memory or a crash. The highest threat from this vulnerability is to data confidentiality as well as system availability.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: out-of-bounds read in libiscsi module", "title": "Vulnerability summary" }, { "category": "other", "text": "Red Hat Product Security is aware of this issue. Updates will be released as they become available.", "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.EUS:kernel-rt-0:4.18.0-193.51.1.rt13.101.el8_2.src", "NFV-8.2.0.Z.EUS:kernel-rt-0:4.18.0-193.51.1.rt13.101.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-core-0:4.18.0-193.51.1.rt13.101.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-0:4.18.0-193.51.1.rt13.101.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-core-0:4.18.0-193.51.1.rt13.101.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-debuginfo-0:4.18.0-193.51.1.rt13.101.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-devel-0:4.18.0-193.51.1.rt13.101.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-kvm-0:4.18.0-193.51.1.rt13.101.el8_2.x86_64", 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"name": "Access of Memory Location After End of Buffer" }, "discovery_date": "2021-02-18T00:00:00+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "1930078" } ], "notes": [ { "category": "description", "text": "A flaw was found in the Linux kernel. A heap buffer overflow in the iSCSI subsystem is triggered by setting an iSCSI string attribute to a value larger than one page and then trying to read it. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: heap buffer overflow in the iSCSI subsystem", "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.EUS:kernel-rt-0:4.18.0-193.51.1.rt13.101.el8_2.src", "NFV-8.2.0.Z.EUS:kernel-rt-0:4.18.0-193.51.1.rt13.101.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-core-0:4.18.0-193.51.1.rt13.101.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-0:4.18.0-193.51.1.rt13.101.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-core-0:4.18.0-193.51.1.rt13.101.el8_2.x86_64", 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