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      "text" : "Copyright © Red Hat, Inc. All rights reserved.",
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      "category" : "summary",
      "text" : "Red Hat OpenShift Container Platform release 4.21.42 is now available with updates to packages and images that fix several bugs and add enhancements.\n\nThis release includes a security update for Red Hat OpenShift Container Platform 4.21.\n\nRed Hat Product Security has rated this update as having a security impact of Critical. 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" : "Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments.\n\nThis advisory contains the container images for Red Hat OpenShift Container Platform 4.21.42. See the following advisory for the RPM packages for this release:\n\nhttps://access.redhat.com/errata/RHBA-2026:95407\n\nSpace precludes documenting all of the container images in this advisory. See the following Release Notes documentation, which will be updated shortly for this release, for details about these changes:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.21/html/release_notes/\n\nSecurity Fix(es):\n\n* kernel: ipv4: free inet_opt and ireq_opt after an RCU grace period (CVE-2026-98432)\n* brotli: Out-of-Bounds Write in Google Brotli Decoder (CVE-2026-111497)\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\nAll OpenShift Container Platform 4.21 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.21/html-single/updating_clusters/index#updating-cluster-cli.",
      "title" : "Details"
    }, {
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      "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"
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      "summary" : "https://access.redhat.com/errata/RHSA-2026:95408",
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      "summary" : "2558973",
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    }, {
      "category" : "external",
      "summary" : "OCPBUGS-133839",
      "url" : "https://issues.redhat.com/browse/OCPBUGS-133839"
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      "summary" : "Canonical URL",
      "url" : "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_95408.json"
    } ],
    "title" : "Red Hat Security Advisory: OpenShift Container Platform 4.21.42 bug fix and security update",
    "tracking" : {
      "current_release_date" : "2026-11-11T14:43:32+00:00",
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        "name" : "x86_64"
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      "category" : "vendor",
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      "full_product_name" : {
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  },
  "vulnerabilities" : [ {
    "cve" : "CVE-2026-98432",
    "cwe" : {
      "id" : "CWE-825",
      "name" : "Expired Pointer Dereference"
    },
    "discovery_date" : "2026-10-15T00:00:00+00:00",
    "ids" : [ {
      "system_name" : "Red Hat Bugzilla ID",
      "text" : "2553390"
    } ],
    "notes" : [ {
      "category" : "description",
      "text" : "A flaw was found in the Linux kernel's IPv4 networking subsystem. A race condition occurs during concurrent processing of retransmitted Transmission Control Protocol (TCP) connection requests or socket migrations, allowing socket options to be freed while still in use. A remote attacker could exploit this vulnerability by sending specially timed network requests, triggering a use-after-free condition. This could results in system crash leading to a Denial of Service (DoS), memory corruption, or remote code execution.",
      "title" : "Vulnerability description"
    }, {
      "category" : "summary",
      "text" : "kernel: ipv4: free inet_opt and ireq_opt after an RCU grace period",
      "title" : "Vulnerability summary"
    }, {
      "category" : "other",
      "text" : "This vulnerability is rated as Critical severity for Red Hat Enterprise Linux because it allows an unauthenticated remote attacker to cause kernel memory corruption or an immediate system crash over standard IPv4 TCP network traffic without requiring local privileges or user interaction. In default enterprise configurations across Red Hat environments, TCP services accept incoming connections without specialized tuning, making the concurrent connection handling paths inherently exposed to remote networks. Although reliably executing arbitrary code through this timing-sensitive use-after-free scenario requires precise heap control, the lack of network prerequisites and the potential for severe system instability elevate the impact above Important.",
      "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" : [ "9Base-RHOSE-4.21:rhcos-aarch64-4.21.9.6.202611042115-0", "9Base-RHOSE-4.21:rhcos-ppc64le-4.21.9.6.202611042115-0", "9Base-RHOSE-4.21:rhcos-s390x-4.21.9.6.202611042115-0", "9Base-RHOSE-4.21:rhcos-x86_64-4.21.9.6.202611042115-0" ]
    },
    "references" : [ {
      "category" : "self",
      "summary" : "Canonical URL",
      "url" : "https://access.redhat.com/security/cve/CVE-2026-98432"
    }, {
      "category" : "external",
      "summary" : "RHBZ#2553390",
      "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2553390"
    }, {
      "category" : "external",
      "summary" : "RHSB-2026-016",
      "url" : "https://access.redhat.com/security/vulnerabilities/RHSB-2026-016"
    }, {
      "category" : "external",
      "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-98432",
      "url" : "https://www.cve.org/CVERecord?id=CVE-2026-98432"
    }, {
      "category" : "external",
      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-98432",
      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-98432"
    }, {
      "category" : "external",
      "summary" : "https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98432.mbox",
      "url" : "https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98432.mbox"
    } ],
    "release_date" : "2026-10-15T00:00:00+00:00",
    "remediations" : [ {
      "category" : "vendor_fix",
      "date" : "2026-11-09T02:02:34+00:00",
      "details" : "For OpenShift Container Platform 4.21 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.21/html/release_notes/\n\nYou may download the oc tool and use it to inspect release image metadata for x86_64, s390x, ppc64le, and aarch64 architectures. The image digests may be found at https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags.\n\nThe sha values for the release are as follows:\n\n      (For x86_64 architecture)\n      The image digest is sha256:38312c2ae5e7dbdea4407436830372558fc0ef66a933c9bf47f06dfd7b5e4680\n\n      (For s390x architecture)\n      The image digest is sha256:1106da94177b9358022a2c8fcabf65774ad119e18868029a285d38393874e1d6\n\n      (For ppc64le architecture)\n      The image digest is sha256:4a52f94e18cf97a4fccbbb85d1303a3c952bcaa0c0c174a5b0fb58b7854fdfef\n\n      (For aarch64 architecture)\n      The image digest is sha256:b5b6816d26b4ab608fa25c61b1f053b4b5f99b48ed38a9a6aa722fabc2cd33de\n\nAll OpenShift Container Platform 4.21 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.21/html-single/updating_clusters/index#updating-cluster-cli.",
      "product_ids" : [ "9Base-RHOSE-4.21:rhcos-aarch64-4.21.9.6.202611042115-0", "9Base-RHOSE-4.21:rhcos-ppc64le-4.21.9.6.202611042115-0", "9Base-RHOSE-4.21:rhcos-s390x-4.21.9.6.202611042115-0", "9Base-RHOSE-4.21:rhcos-x86_64-4.21.9.6.202611042115-0" ],
      "restart_required" : {
        "category" : "none"
      },
      "url" : "https://access.redhat.com/errata/RHSA-2026:95408"
    }, {
      "category" : "workaround",
      "details" : "See the security bulletin for a detailed mitigation procedure.",
      "product_ids" : [ "9Base-RHOSE-4.21:rhcos-aarch64-4.21.9.6.202611042115-0", "9Base-RHOSE-4.21:rhcos-ppc64le-4.21.9.6.202611042115-0", "9Base-RHOSE-4.21:rhcos-s390x-4.21.9.6.202611042115-0", "9Base-RHOSE-4.21:rhcos-x86_64-4.21.9.6.202611042115-0" ]
    } ],
    "scores" : [ {
      "cvss_v3" : {
        "attackComplexity" : "LOW",
        "attackVector" : "NETWORK",
        "availabilityImpact" : "HIGH",
        "baseScore" : 9.8,
        "baseSeverity" : "CRITICAL",
        "confidentialityImpact" : "HIGH",
        "integrityImpact" : "HIGH",
        "privilegesRequired" : "NONE",
        "scope" : "UNCHANGED",
        "userInteraction" : "NONE",
        "vectorString" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
        "version" : "3.1"
      },
      "products" : [ "9Base-RHOSE-4.21:rhcos-aarch64-4.21.9.6.202611042115-0", "9Base-RHOSE-4.21:rhcos-ppc64le-4.21.9.6.202611042115-0", "9Base-RHOSE-4.21:rhcos-s390x-4.21.9.6.202611042115-0", "9Base-RHOSE-4.21:rhcos-x86_64-4.21.9.6.202611042115-0" ]
    } ],
    "threats" : [ {
      "category" : "impact",
      "details" : "Critical"
    } ],
    "title" : "kernel: ipv4: free inet_opt and ireq_opt after an RCU grace period"
  }, {
    "cve" : "CVE-2026-111497",
    "cwe" : {
      "id" : "CWE-787",
      "name" : "Out-of-bounds Write"
    },
    "discovery_date" : "2026-10-22T13:42:58.596140+00:00",
    "ids" : [ {
      "system_name" : "Red Hat Bugzilla ID",
      "text" : "2558973"
    } ],
    "notes" : [ {
      "category" : "description",
      "text" : "A flaw was found in the Google Brotli decoder. An out-of-bounds write in the block-type switch handling in c/dec/decode.c can be triggered by a crafted Brotli-compressed stream. When an application decompresses untrusted Brotli data, this can lead to memory disclosure, denial of service, or potentially arbitrary code execution.",
      "title" : "Vulnerability description"
    }, {
      "category" : "summary",
      "text" : "brotli: Out-of-Bounds Write in Google Brotli Decoder",
      "title" : "Vulnerability summary"
    }, {
      "category" : "other",
      "text" : "This issue is rated Important. Exploitation requires that the target decompress attacker-controlled Brotli data (for example HTTP content negotiated with Content-Encoding: br, or APIs such as Node.js zlib / fetch() that decode Brotli). The vulnerable path is reached with a malformed stream rather than typical well-formed encoder output. Red Hat Enterprise Linux compiler and runtime hardenings - including Address Space Layout Randomization (ASLR), Non-eXecutable (NX) memory, FORTIFY_SOURCE, and SELinux - increase the difficulty of turning this memory corruption into reliable code execution, though they do not eliminate crashes or all impact. Combined with the Attack Requirements noted by the CNA (CVSS v4 AT:P), Red Hat scores Attack Complexity as High and rates the flaw Important rather than Critical.\n\n---\n\nThe Node.js packages in Red Hat Enterprise Linux use either system version of brotli or bundled version. Some Node.js versions are marked \"Not affected\" because they utilize system brotli. For these versions, the Node.js package itself does not require updating. However, customers must still update the system brotli/libbrotli package to address the vulnerability for these Node.js installations.\n\nFollowing is the overview of Node.js versions use system or bundled version.\n\n- Node.js 22 in Red Hat Enterprise Linux 8 and 9, provided via nodejs:22 module, uses system brotli.\n- Node.js 24 in Red Hat Enterprise Linux 8 and 9, provided via nodejs:24 modules, use bundled brotli.\n- Node.js 22 and 24 in Red Hat Enterprise Linux 10, provided via nodejs22 and nodejs24 use system brotli.\n\n---\n\nThe .NET packages in Red Hat Enterprise Linux may either use system version of brotli or bundled version. Following is the overview of .NET versions use system or bundled version.\n\n- .NET 8.0 in Red Hat Enterprise Linux 8, 9, and 10, provided via dotnet8.0 packages, use bundled brotli.\n- .NET 9.0, 10.0, and 11.0 in Red Hat Enterprise Linux 8, 9, and 10, provided via dotnet9.0, dotnet10.0, and dotnet11.0 packages, use system brotli.",
      "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" : [ "9Base-RHOSE-4.21:rhcos-aarch64-4.21.9.6.202611042115-0", "9Base-RHOSE-4.21:rhcos-ppc64le-4.21.9.6.202611042115-0", "9Base-RHOSE-4.21:rhcos-s390x-4.21.9.6.202611042115-0", "9Base-RHOSE-4.21:rhcos-x86_64-4.21.9.6.202611042115-0" ]
    },
    "references" : [ {
      "category" : "self",
      "summary" : "Canonical URL",
      "url" : "https://access.redhat.com/security/cve/CVE-2026-111497"
    }, {
      "category" : "external",
      "summary" : "RHBZ#2558973",
      "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2558973"
    }, {
      "category" : "external",
      "summary" : "RHSB-2026-015",
      "url" : "https://access.redhat.com/security/vulnerabilities/RHSB-2026-015"
    }, {
      "category" : "external",
      "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-111497",
      "url" : "https://www.cve.org/CVERecord?id=CVE-2026-111497"
    }, {
      "category" : "external",
      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-111497",
      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-111497"
    }, {
      "category" : "external",
      "summary" : "https://nodejs.org/en/blog/vulnerability/october-2026-security-releases#nodejs-brotli-decoder-out-of-bounds-write-permits-remote-code-execution-cve-2026-111497---high",
      "url" : "https://nodejs.org/en/blog/vulnerability/october-2026-security-releases#nodejs-brotli-decoder-out-of-bounds-write-permits-remote-code-execution-cve-2026-111497---high"
    }, {
      "category" : "external",
      "summary" : "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "url" : "https://www.cisa.gov/known-exploited-vulnerabilities-catalog"
    } ],
    "release_date" : "2026-10-22T13:35:41.975000+00:00",
    "remediations" : [ {
      "category" : "vendor_fix",
      "date" : "2026-11-09T02:02:34+00:00",
      "details" : "For OpenShift Container Platform 4.21 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.21/html/release_notes/\n\nYou may download the oc tool and use it to inspect release image metadata for x86_64, s390x, ppc64le, and aarch64 architectures. The image digests may be found at https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags.\n\nThe sha values for the release are as follows:\n\n      (For x86_64 architecture)\n      The image digest is sha256:38312c2ae5e7dbdea4407436830372558fc0ef66a933c9bf47f06dfd7b5e4680\n\n      (For s390x architecture)\n      The image digest is sha256:1106da94177b9358022a2c8fcabf65774ad119e18868029a285d38393874e1d6\n\n      (For ppc64le architecture)\n      The image digest is sha256:4a52f94e18cf97a4fccbbb85d1303a3c952bcaa0c0c174a5b0fb58b7854fdfef\n\n      (For aarch64 architecture)\n      The image digest is sha256:b5b6816d26b4ab608fa25c61b1f053b4b5f99b48ed38a9a6aa722fabc2cd33de\n\nAll OpenShift Container Platform 4.21 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.21/html-single/updating_clusters/index#updating-cluster-cli.",
      "product_ids" : [ "9Base-RHOSE-4.21:rhcos-aarch64-4.21.9.6.202611042115-0", "9Base-RHOSE-4.21:rhcos-ppc64le-4.21.9.6.202611042115-0", "9Base-RHOSE-4.21:rhcos-s390x-4.21.9.6.202611042115-0", "9Base-RHOSE-4.21:rhcos-x86_64-4.21.9.6.202611042115-0" ],
      "restart_required" : {
        "category" : "none"
      },
      "url" : "https://access.redhat.com/errata/RHSA-2026:95408"
    }, {
      "category" : "workaround",
      "details" : "See the security bulletin for a detailed mitigation procedure.",
      "product_ids" : [ "9Base-RHOSE-4.21:rhcos-aarch64-4.21.9.6.202611042115-0", "9Base-RHOSE-4.21:rhcos-ppc64le-4.21.9.6.202611042115-0", "9Base-RHOSE-4.21:rhcos-s390x-4.21.9.6.202611042115-0", "9Base-RHOSE-4.21:rhcos-x86_64-4.21.9.6.202611042115-0" ]
    } ],
    "scores" : [ {
      "cvss_v3" : {
        "attackComplexity" : "HIGH",
        "attackVector" : "NETWORK",
        "availabilityImpact" : "HIGH",
        "baseScore" : 8.1,
        "baseSeverity" : "HIGH",
        "confidentialityImpact" : "HIGH",
        "integrityImpact" : "HIGH",
        "privilegesRequired" : "NONE",
        "scope" : "UNCHANGED",
        "userInteraction" : "NONE",
        "vectorString" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
        "version" : "3.1"
      },
      "products" : [ "9Base-RHOSE-4.21:rhcos-aarch64-4.21.9.6.202611042115-0", "9Base-RHOSE-4.21:rhcos-ppc64le-4.21.9.6.202611042115-0", "9Base-RHOSE-4.21:rhcos-s390x-4.21.9.6.202611042115-0", "9Base-RHOSE-4.21:rhcos-x86_64-4.21.9.6.202611042115-0" ]
    } ],
    "threats" : [ {
      "category" : "exploit_status",
      "date" : "2026-10-27T00:00:00+00:00",
      "details" : "CISA: https://www.cisa.gov/known-exploited-vulnerabilities-catalog"
    }, {
      "category" : "impact",
      "details" : "Important"
    } ],
    "title" : "brotli: Out-of-Bounds Write in Google Brotli Decoder"
  } ]
}