{ "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 in eventpoll.c may lead to escalation of privilege (CVE-2020-0466)\n\n* kernel: Integer overflow in Intel(R) Graphics Drivers (CVE-2020-12362)\n\n* kernel: SCSI target (LIO) write to any block on ILO backstore (CVE-2020-28374)\n\n* kernel: DoS by corrupting mountpoint reference counter (CVE-2020-12114)\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.z9 Batch source tree (BZ#1949685)", "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-2021:2190", "url": "https://access.redhat.com/errata/RHSA-2021:2190" }, { "category": "external", "summary": "https://access.redhat.com/security/updates/classification/#important", "url": "https://access.redhat.com/security/updates/classification/#important" }, { "category": "external", "summary": "1848652", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1848652" }, { "category": "external", "summary": "1899804", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1899804" }, { "category": "external", "summary": "1920480", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1920480" }, { "category": "external", "summary": "1930246", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1930246" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_2190.json" } ], "title": "Red Hat Security Advisory: kernel-rt security and bug fix update", "tracking": { "current_release_date": "2026-06-28T12:34:30+00:00", "generator": { "date": "2026-06-28T12:34:30+00:00", "engine": { "name": "Red Hat SDEngine", "version": "5.2.6" } }, "id": "RHSA-2021:2190", "initial_release_date": "2021-06-01T16:06:35+00:00", "revision_history": [ { "date": "2021-06-01T16:06:35+00:00", "number": "1", "summary": "Initial version" }, { "date": "2021-06-01T16:06:35+00:00", "number": "2", "summary": "Last updated version" }, { "date": 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"text": "1920480" } ], "notes": [ { "category": "description", "text": "A flaw was found in the Linux kernel. A logic error in eventpoll.c can cause a use-after-free, leading to a local escalation of privilege with no additional execution privileges. User interaction is not needed for exploitation. The highest threat from this vulnerability is to confidentiality, integrity as well as system availability.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: use after free in eventpoll.c may lead to escalation of privilege", "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-0:4.18.0-193.56.1.rt13.106.el8_2.src", "NFV-8.2.0.Z.EUS:kernel-rt-0:4.18.0-193.56.1.rt13.106.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-core-0:4.18.0-193.56.1.rt13.106.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-0:4.18.0-193.56.1.rt13.106.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-core-0:4.18.0-193.56.1.rt13.106.el8_2.x86_64", 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This flaw allows a local privileged user (root outside or root inside a privileged container) to exploit a race condition to manipulate the reference count of the root filesystem. To be able to abuse this flaw, the process or user calling pivot_root must have advanced permissions. The highest threat from this vulnerability is to system availability.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: DoS by corrupting mountpoint reference counter", "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-0:4.18.0-193.56.1.rt13.106.el8_2.src", "NFV-8.2.0.Z.EUS:kernel-rt-0:4.18.0-193.56.1.rt13.106.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-core-0:4.18.0-193.56.1.rt13.106.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-0:4.18.0-193.56.1.rt13.106.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-core-0:4.18.0-193.56.1.rt13.106.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-debuginfo-0:4.18.0-193.56.1.rt13.106.el8_2.x86_64", 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An integer overflow in the firmware for some Intel(R) Graphics Drivers may allow a privileged user to potentially enable an escalation of privilege via local access. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: Integer overflow in Intel(R) Graphics Drivers", "title": "Vulnerability summary" }, { "category": "other", "text": "Only users that specify i915.enable_guc=-1 or i915.enable_guc=1 or 2 are open to be exploited by this issue.\n\nDue to the full fix (combination of kernel and firmware updates) being invasive and GUC firmware loading is off by default, Red Hat Enterprise Linux kernel versions prior to the Linux kernel version shipped with Red Hat Enterprise Linux 8.4 GA (kernel-4.18.0-305.el8) print a warning in the kernel log (\"GUC firmware is insecure - CVE 2020-12362 - Please update to a newer release to get secure GUC\") and do not rely on the firmware fix. As a result, Red Hat Enterprise Linux versions prior Red Hat Enterprise Linux 8.4 GA (including Red Hat Enterprise Linux 6 and 7) do not include the updated firmware packages.", "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-0:4.18.0-193.56.1.rt13.106.el8_2.src", "NFV-8.2.0.Z.EUS:kernel-rt-0:4.18.0-193.56.1.rt13.106.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-core-0:4.18.0-193.56.1.rt13.106.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-0:4.18.0-193.56.1.rt13.106.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-core-0:4.18.0-193.56.1.rt13.106.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-debuginfo-0:4.18.0-193.56.1.rt13.106.el8_2.x86_64", 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This flaw allows an authenticated attacker to send LIO block requests to the Linux system to overwrite data on the backing store. The highest threat from this vulnerability is to integrity. In addition, this flaw affects the tcmu-runner package, where the affected SCSI command is called.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: SCSI target (LIO) write to any block on ILO backstore", "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-0:4.18.0-193.56.1.rt13.106.el8_2.src", "NFV-8.2.0.Z.EUS:kernel-rt-0:4.18.0-193.56.1.rt13.106.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-core-0:4.18.0-193.56.1.rt13.106.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-0:4.18.0-193.56.1.rt13.106.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-core-0:4.18.0-193.56.1.rt13.106.el8_2.x86_64", 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