{ "document" : { "aggregate_severity" : { "namespace" : "https://access.redhat.com/security/updates/classification/", "text" : "Moderate" }, "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 is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service.\n\nRed Hat Product Security has rated this update as having a security impact of Moderate. 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 packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n\n* kernel: net/sched: cls_u32: use skb_header_pointer_careful() (CVE-2026-23204)\n\n* kernel: kernel: Privilege escalation or denial of service via use-after-free in nf_tables_addchain() (CVE-2026-23231)\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.", "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-2026:9515", "url" : "https://access.redhat.com/errata/RHSA-2026:9515" }, { "category" : "external", "summary" : "https://access.redhat.com/security/updates/classification/#moderate", "url" : "https://access.redhat.com/security/updates/classification/#moderate" }, { "category" : "external", "summary" : "2439931", "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2439931" }, { "category" : "external", "summary" : "2444376", "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2444376" }, { "category" : "self", "summary" : "Canonical URL", "url" : "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_9515.json" } ], "title" : "Red Hat Security Advisory: kernel security update", "tracking" : { "current_release_date" : "2026-04-27T14:23:18+00:00", "generator" : { "date" : "2026-04-27T14:23:18+00:00", "engine" : { "name" : "Red Hat SDEngine", "version" : "4.7.5" } }, "id" : "RHSA-2026:9515", "initial_release_date" : "2026-04-22T00:25:41+00:00", "revision_history" : [ { "date" : "2026-04-22T00:25:41+00:00", "number" : "1", "summary" : "Initial version" }, { "date" : "2026-04-22T00:25:41+00:00", "number" : "2", "summary" : "Last updated version" }, { "date" : "2026-04-27T14:23:18+00:00", "number" : "3", "summary" : "Last generated version" } ], "status" : "final", "version" : "3" } }, "product_tree" : { "branches" : [ { "branches" : [ { "branches" : [ { "category" : 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"BaseOS-8.8.0.Z.TUS:python3-perf-0:4.18.0-477.136.1.el8_8.x86_64" }, "product_reference" : "python3-perf-0:4.18.0-477.136.1.el8_8.x86_64", "relates_to_product_reference" : "BaseOS-8.8.0.Z.TUS" }, { "category" : "default_component_of", "full_product_name" : { "name" : "python3-perf-debuginfo-0:4.18.0-477.136.1.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS TUS (v.8.8)", "product_id" : "BaseOS-8.8.0.Z.TUS:python3-perf-debuginfo-0:4.18.0-477.136.1.el8_8.x86_64" }, "product_reference" : "python3-perf-debuginfo-0:4.18.0-477.136.1.el8_8.x86_64", "relates_to_product_reference" : "BaseOS-8.8.0.Z.TUS" } ] }, "vulnerabilities" : [ { "cve" : "CVE-2026-23204", "cwe" : { "id" : "CWE-1285", "name" : "Improper Validation of Specified Index, Position, or Offset in Input" }, "discovery_date" : "2026-02-14T00:00:00+00:00", "ids" : [ { "system_name" : "Red Hat Bugzilla ID", "text" : "2439931" } ], "notes" : [ { "category" : "description", "text" : "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_u32: use skb_header_pointer_careful()\n\nskb_header_pointer() does not fully validate negative @offset values.\n\nUse skb_header_pointer_careful() instead.\n\nGangMin Kim provided a report and a repro fooling u32_classify():\n\nBUG: KASAN: slab-out-of-bounds in u32_classify+0x1180/0x11b0\nnet/sched/cls_u32.c:221", "title" : "Vulnerability description" }, { "category" : "summary", "text" : "kernel: net/sched: cls_u32: use skb_header_pointer_careful()", "title" : "Vulnerability summary" }, { "category" : "other", "text" : "An out of bounds memory access vulnerability exists in the Linux traffic control u32 classifier implementation. In u32_classify the kernel calculates offsets such as toff using key off values masks and variable offsets and then dereferences packet data using skb_header_pointer. The helper skb_header_pointer does not fully validate negative offset values. With a crafted configuration and packet layout the computed offset can become negative or otherwise invalid in a way that bypasses the existing checks and results in an out of bounds access. The most direct impact is a kernel crash causing a denial of service. Because the access pattern involves reading packet data at attacker influenced offsets it may also allow information disclosure of adjacent kernel memory and in worst cases could contribute to privilege escalation chains. Exploitation prerequisites depend on whether the system has tc u32 filters configured on a traffic path. For the CVSS the base score uses PR:L because configuring tc filters typically requires elevated privileges but can be available in containers or network namespaces with CAP_NET_ADMIN.", "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" : [ "BaseOS-8.8.0.Z.E4S:bpftool-0:4.18.0-477.136.1.el8_8.ppc64le", "BaseOS-8.8.0.Z.E4S:bpftool-0:4.18.0-477.136.1.el8_8.x86_64", "BaseOS-8.8.0.Z.E4S:bpftool-debuginfo-0:4.18.0-477.136.1.el8_8.ppc64le", "BaseOS-8.8.0.Z.E4S:bpftool-debuginfo-0:4.18.0-477.136.1.el8_8.x86_64", "BaseOS-8.8.0.Z.E4S:kernel-0:4.18.0-477.136.1.el8_8.ppc64le", "BaseOS-8.8.0.Z.E4S:kernel-0:4.18.0-477.136.1.el8_8.src", "BaseOS-8.8.0.Z.E4S:kernel-0:4.18.0-477.136.1.el8_8.x86_64", 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"https://bugzilla.redhat.com/show_bug.cgi?id=2439931" }, { "category" : "external", "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-23204", "url" : "https://www.cve.org/CVERecord?id=CVE-2026-23204" }, { "category" : "external", "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-23204", "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-23204" }, { "category" : "external", "summary" : "https://lore.kernel.org/linux-cve-announce/2026021437-CVE-2026-23204-be85@gregkh/T", "url" : "https://lore.kernel.org/linux-cve-announce/2026021437-CVE-2026-23204-be85@gregkh/T" } ], "release_date" : "2026-02-14T00:00:00+00:00", "remediations" : [ { "category" : "vendor_fix", "date" : "2026-04-22T00:25:41+00:00", "details" : "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.", "product_ids" : [ 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] } ], "threats" : [ { "category" : "impact", "details" : "Moderate" } ], "title" : "kernel: net/sched: cls_u32: use skb_header_pointer_careful()" }, { "cve" : "CVE-2026-23231", "cwe" : { "id" : "CWE-416", "name" : "Use After Free" }, "discovery_date" : "2026-03-04T00:00:00+00:00", "ids" : [ { "system_name" : "Red Hat Bugzilla ID", "text" : "2444376" } ], "notes" : [ { "category" : "description", "text" : "A flaw was found in the Linux kernel. A local attacker with CAP_NET_ADMIN capabilities, or remote packet traffic, could exploit a use-after-free vulnerability in the nf_tables_addchain() function's error handling. Successful exploitation could lead to a kernel crash, resulting in a Denial of Service (DoS), or potentially privilege escalation.", "title" : "Vulnerability description" }, { "category" : "summary", "text" : "kernel: kernel: Privilege escalation or denial of service via use-after-free in nf_tables_addchain()", "title" : "Vulnerability summary" }, { "category" : "other", "text" : "A use after free can occur in nf_tables_addchain error handling because a new chain is published to table chains via RCU before hook registration completes and is then freed without an RCU grace period when hook registration fails. This creates a race with RCU readers in the control plane such as nf_tables_dump_chains and also with in flight packet evaluation when an IPv4 hook is transiently installed for NFPROTO_INET and later IPv6 hook registration fails. For the CVSS the PR is L because a local actor with CAP_NET_ADMIN can induce the failing add chain path while remote packet traffic may hit the transient hook and trigger the UAF window. Impact ranges from a kernel crash to potential privilege escalation.", "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" : [ "BaseOS-8.8.0.Z.E4S:bpftool-0:4.18.0-477.136.1.el8_8.ppc64le", "BaseOS-8.8.0.Z.E4S:bpftool-0:4.18.0-477.136.1.el8_8.x86_64", "BaseOS-8.8.0.Z.E4S:bpftool-debuginfo-0:4.18.0-477.136.1.el8_8.ppc64le", "BaseOS-8.8.0.Z.E4S:bpftool-debuginfo-0:4.18.0-477.136.1.el8_8.x86_64", "BaseOS-8.8.0.Z.E4S:kernel-0:4.18.0-477.136.1.el8_8.ppc64le", "BaseOS-8.8.0.Z.E4S:kernel-0:4.18.0-477.136.1.el8_8.src", "BaseOS-8.8.0.Z.E4S:kernel-0:4.18.0-477.136.1.el8_8.x86_64", "BaseOS-8.8.0.Z.E4S:kernel-abi-stablelists-0:4.18.0-477.136.1.el8_8.noarch", "BaseOS-8.8.0.Z.E4S:kernel-core-0:4.18.0-477.136.1.el8_8.ppc64le", 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"https://www.cve.org/CVERecord?id=CVE-2026-23231" }, { "category" : "external", "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-23231", "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-23231" }, { "category" : "external", "summary" : "https://lore.kernel.org/linux-cve-announce/2026030436-CVE-2026-23231-1a96@gregkh/T", "url" : "https://lore.kernel.org/linux-cve-announce/2026030436-CVE-2026-23231-1a96@gregkh/T" } ], "release_date" : "2026-03-04T00:00:00+00:00", "remediations" : [ { "category" : "vendor_fix", "date" : "2026-04-22T00:25:41+00:00", "details" : "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.", "product_ids" : [ "BaseOS-8.8.0.Z.E4S:bpftool-0:4.18.0-477.136.1.el8_8.ppc64le", "BaseOS-8.8.0.Z.E4S:bpftool-0:4.18.0-477.136.1.el8_8.x86_64", 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