{ "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 9.\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: Small table perturb size in the TCP source port generation algorithm can lead to information leak (CVE-2022-1012)\n\n* kernel: race condition in perf_event_open leads to privilege escalation (CVE-2022-1729)\n\n* kernel: a use-after-free write in the netfilter subsystem can lead to privilege escalation to root (CVE-2022-1966)\n\n* kernel: buffer overflow in IPsec ESP transformation code (CVE-2022-27666)\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-9.0.z1 Batch (BZ#2089492)", "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-2022:5267", "url": "https://access.redhat.com/errata/RHSA-2022:5267" }, { "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/documentation/en-us/red_hat_enterprise_linux/9/html/9.0_release_notes/index", "url": "https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html/9.0_release_notes/index" }, { "category": "external", "summary": "2061633", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2061633" }, { "category": "external", "summary": "2064604", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2064604" }, { "category": "external", "summary": "2086753", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2086753" }, { "category": "external", "summary": "2092427", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2092427" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2022/rhsa-2022_5267.json" } ], "title": "Red Hat Security Advisory: kernel-rt security and bug fix update", "tracking": { "current_release_date": "2026-06-28T12:36:49+00:00", "generator": { "date": "2026-06-28T12:36:49+00:00", "engine": { "name": "Red Hat SDEngine", "version": "5.2.6" } }, "id": "RHSA-2022:5267", 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to an Unauthorized Actor" }, "discovery_date": "2022-03-16T00:00:00+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2064604" } ], "notes": [ { "category": "description", "text": "The Linux kernel's TCP source port generation algorithm in the TCP stack contains a flaw due to the small table perturb size. This flaw allows an attacker to positively distinguish a system among devices with identical hardware and software, which lasts until the device restarts.\r\n\r\nAn attacker can guess the evolution of the internal state used for source port generation. This information is used to infer the TCP traffic patterns of the victim, guessing the number of outgoing TCP connections established in a specific time frame, which can lead to a system fingerprinting.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: Small table perturb size in the TCP source port generation algorithm can lead to information leak", "title": "Vulnerability summary" }, { "category": "other", "text": "Red Hat Enterprise Linux version 7 (RHEL7) is not affected by this issue. While RHEL7 implements the TCP port randomization algorithm 3 (the Simple Hash-Based Port Selection Algorithm), which knowingly has shortcomings (as per RFC 6056, item 3.3.3), the object of study of this flaw was the TCP port selector algorithm 4, the Double-Hash Port Selection Algorithm, which is not existent in RHEL7.\n\nThis flaw is ranked as a Moderate impact due to:\n* Limited exposure of the data in the TCP stack;\n* The impact of this vulnerability is limited to a system fingerprinting;\n* The requirements to carry the attack are elevated, requiring monitoring of the data flow.", "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-9.0.0.Z.MAIN.EUS:kernel-rt-0:5.14.0-70.17.1.rt21.89.el9_0.src", 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events functionality. A user triggers a race condition in setting up performance monitoring between the leading PERF_TYPE_TRACEPOINT and sub PERF_EVENT_HARDWARE plus the PERF_EVENT_SOFTWARE using the perf_event_open() function with these three types. This flaw allows a local user to crash the system.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: race condition in perf_event_open leads to privilege escalation", "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-9.0.0.Z.MAIN.EUS:kernel-rt-0:5.14.0-70.17.1.rt21.89.el9_0.src", "NFV-9.0.0.Z.MAIN.EUS:kernel-rt-0:5.14.0-70.17.1.rt21.89.el9_0.x86_64", "NFV-9.0.0.Z.MAIN.EUS:kernel-rt-core-0:5.14.0-70.17.1.rt21.89.el9_0.x86_64", "NFV-9.0.0.Z.MAIN.EUS:kernel-rt-debug-0:5.14.0-70.17.1.rt21.89.el9_0.x86_64", "NFV-9.0.0.Z.MAIN.EUS:kernel-rt-debug-core-0:5.14.0-70.17.1.rt21.89.el9_0.x86_64", 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some situations. A local attacker could use this to cause a denial of service (system crash) or execute arbitrary code.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: netfilter: nf_tables: incorrect NFT_STATEFUL_EXPR check leads to a use-after-free (write)", "title": "Vulnerability summary" }, { "category": "other", "text": "This CVE has been rejected. This candidate is a duplicate of CVE-2022-32250. 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This flaw allows a local attacker with a normal user privilege to overwrite kernel heap objects and may cause a local privilege escalation threat.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: buffer overflow in IPsec ESP transformation code", "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-9.0.0.Z.MAIN.EUS:kernel-rt-0:5.14.0-70.17.1.rt21.89.el9_0.src", "NFV-9.0.0.Z.MAIN.EUS:kernel-rt-0:5.14.0-70.17.1.rt21.89.el9_0.x86_64", "NFV-9.0.0.Z.MAIN.EUS:kernel-rt-core-0:5.14.0-70.17.1.rt21.89.el9_0.x86_64", "NFV-9.0.0.Z.MAIN.EUS:kernel-rt-debug-0:5.14.0-70.17.1.rt21.89.el9_0.x86_64", 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This flaw allows a local attacker with user access to cause a privilege escalation issue.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: a use-after-free write in the netfilter subsystem can lead to privilege escalation to root", "title": "Vulnerability summary" }, { "category": "other", "text": "The latest kernel in RHCOS is kernel-4.18.0-305.49.1.el8 which does not contain the vulnerable code and is not affected, also OCP v4.9 or earlier 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-9.0.0.Z.MAIN.EUS:kernel-rt-0:5.14.0-70.17.1.rt21.89.el9_0.src", "NFV-9.0.0.Z.MAIN.EUS:kernel-rt-0:5.14.0-70.17.1.rt21.89.el9_0.x86_64", 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