{ "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 is now available for Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On.\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 packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n\n* kernel: ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr (CVE-2025-68183)\n\n* kernel: smb: client: fix OOB reads parsing symlink error response (CVE-2026-31613)\n\n* kernel: net: sched: act_csum: validate nested VLAN headers (CVE-2026-31684)\n\n* kernel: netfilter: nf_conntrack_helper: pass helper to expect cleanup (CVE-2026-43027)\n\n* kernel: rtmutex: Use waiter::task instead of current in remove_waiter() (CVE-2026-43499)\n\n* kernel: RDMA/vmw_pvrdma: Fix double free on pvrdma_alloc_ucontext() error path (CVE-2026-46189)\n\n* kernel: drm/gem: Fix inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs() (CVE-2026-46209)\n\n* kernel: nvmet-tcp: fix race between ICReq handling and queue teardown (CVE-2026-46135)\n\n* kernel: futex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock (CVE-2026-53166)\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-2026:40068", "url": "https://access.redhat.com/errata/RHSA-2026:40068" }, { "category": "external", "summary": "https://access.redhat.com/security/updates/classification/#important", "url": "https://access.redhat.com/security/updates/classification/#important" }, { "category": "external", "summary": "2422699", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2422699" }, { "category": "external", "summary": "2461480", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461480" }, { "category": "external", "summary": "2461757", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461757" }, { "category": "external", "summary": "2464369", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464369" }, { "category": "external", "summary": "2480453", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480453" }, { "category": "external", "summary": "2482588", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482588" }, { "category": "external", "summary": "2482636", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482636" }, { "category": "external", "summary": "2482654", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482654" }, { "category": "external", "summary": "2492805", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492805" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_40068.json" } ], "title": "Red Hat Security Advisory: kernel security update", "tracking": { "current_release_date": "2026-10-07T10:12:58+00:00", "generator": { "date": "2026-10-07T10:12:58+00:00", "engine": { "name": "Red Hat SDEngine", "version": "5.4.0" } }, "id": "RHSA-2026:40068", "initial_release_date": "2026-07-15T15:58:53+00:00", "revision_history": [ { "date": "2026-07-15T15:58:53+00:00", "number": "1", "summary": "Initial version" }, { "date": "2026-07-15T15:58:53+00:00", "number": "2", "summary": "Last updated version" }, { "date": "2026-10-07T10:12:58+00:00", "number": "3", "summary": "Last generated version" } ], "status": "final", "version": "3" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Red Hat Enterprise Linux BaseOS AUS (v.8.6)", "product": { "name": "Red Hat Enterprise Linux BaseOS AUS (v.8.6)", "product_id": "BaseOS-8.6.0.Z.AUS", 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"python3-perf-0:4.18.0-372.201.1.el8_6.x86_64", "relates_to_product_reference": "BaseOS-8.6.0.Z.EUS.EXTENSION" }, { "category": "default_component_of", "full_product_name": { "name": "python3-perf-debuginfo-0:4.18.0-372.201.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)", "product_id": "BaseOS-8.6.0.Z.EUS.EXTENSION:python3-perf-debuginfo-0:4.18.0-372.201.1.el8_6.x86_64" }, "product_reference": "python3-perf-debuginfo-0:4.18.0-372.201.1.el8_6.x86_64", "relates_to_product_reference": "BaseOS-8.6.0.Z.EUS.EXTENSION" } ] }, "vulnerabilities": [ { "cve": "CVE-2025-68183", "cwe": { "id": "CWE-354", "name": "Improper Validation of Integrity Check Value" }, "discovery_date": "2025-12-16T00:00:00+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2422699" } ], "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr\n\nCurrently when both IMA and EVM are in fix mode, the IMA signature will\nbe reset to IMA hash if a program first stores IMA signature in\nsecurity.ima and then writes/removes some other security xattr for the\nfile.\n\nFor example, on Fedora, after booting the kernel with \"ima_appraise=fix\nevm=fix ima_policy=appraise_tcb\" and installing rpm-plugin-ima,\ninstalling/reinstalling a package will not make good reference IMA\nsignature generated. Instead IMA hash is generated,\n\n # getfattr -m - -d -e hex /usr/bin/bash\n # file: usr/bin/bash\n security.ima=0x0404...\n\nThis happens because when setting security.selinux, the IMA_DIGSIG flag\nthat had been set early was cleared. As a result, IMA hash is generated\nwhen the file is closed.\n\nSimilarly, IMA signature can be cleared on file close after removing\nsecurity xattr like security.evm or setting/removing ACL.\n\nPrevent replacing the IMA file signature with a file hash, by preventing\nthe IMA_DIGSIG flag from being reset.\n\nHere's a minimal C reproducer which sets security.selinux as the last\nstep which can also replaced by removing security.evm or setting ACL,\n\n #include \n #include \n #include \n #include \n #include \n #include \n\n int main() {\n const char* file_path = \"/usr/sbin/test_binary\";\n const char* hex_string = \"030204d33204490066306402304\";\n int length = strlen(hex_string);\n char* ima_attr_value;\n int fd;\n\n fd = open(file_path, O_WRONLY|O_CREAT|O_EXCL, 0644);\n if (fd == -1) {\n perror(\"Error opening file\");\n return 1;\n }\n\n ima_attr_value = (char*)malloc(length / 2 );\n for (int i = 0, j = 0; i < length; i += 2, j++) {\n sscanf(hex_string + i, \"%2hhx\", &ima_attr_value[j]);\n }\n\n if (fsetxattr(fd, \"security.ima\", ima_attr_value, length/2, 0) == -1) {\n perror(\"Error setting extended attribute\");\n close(fd);\n return 1;\n }\n\n const char* selinux_value= \"system_u:object_r:bin_t:s0\";\n if (fsetxattr(fd, \"security.selinux\", selinux_value, strlen(selinux_value), 0) == -1) {\n perror(\"Error setting extended attribute\");\n close(fd);\n return 1;\n }\n\n close(fd);\n\n return 0;\n }", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr", "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": [ 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"https://bugzilla.redhat.com/show_bug.cgi?id=2422699" }, { "category": "external", "summary": "https://www.cve.org/CVERecord?id=CVE-2025-68183", "url": "https://www.cve.org/CVERecord?id=CVE-2025-68183" }, { "category": "external", "summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-68183", "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68183" }, { "category": "external", "summary": "https://lore.kernel.org/linux-cve-announce/2025121632-CVE-2025-68183-f588@gregkh/T", "url": "https://lore.kernel.org/linux-cve-announce/2025121632-CVE-2025-68183-f588@gregkh/T" } ], "release_date": "2025-12-16T00:00:00+00:00", "remediations": [ { "category": "vendor_fix", "date": "2026-07-15T15:58:53+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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A remote, untrusted server could send a specially crafted symlink error response, leading to an out-of-bounds read vulnerability. This could result in the disclosure of sensitive information from the kernel's memory to a local user through the readlink(2) system call.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: smb: client: fix OOB reads parsing symlink error response", "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": [ "BaseOS-8.6.0.Z.AUS:bpftool-0:4.18.0-372.201.1.el8_6.x86_64", "BaseOS-8.6.0.Z.AUS:bpftool-debuginfo-0:4.18.0-372.201.1.el8_6.x86_64", "BaseOS-8.6.0.Z.AUS:kernel-0:4.18.0-372.201.1.el8_6.src", "BaseOS-8.6.0.Z.AUS:kernel-0:4.18.0-372.201.1.el8_6.x86_64", "BaseOS-8.6.0.Z.AUS:kernel-abi-stablelists-0:4.18.0-372.201.1.el8_6.noarch", 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"category": "impact", "details": "Moderate" } ], "title": "kernel: smb: client: fix OOB reads parsing symlink error response" }, { "cve": "CVE-2026-31684", "cwe": { "id": "CWE-1285", "name": "Improper Validation of Specified Index, Position, or Offset in Input" }, "discovery_date": "2026-04-25T00:00:00+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2461757" } ], "notes": [ { "category": "description", "text": "A flaw was found in the Linux kernel's network scheduler component. A remote attacker could send specially crafted network packets containing nested Virtual Local Area Network (VLAN) headers. This could cause the kernel to read beyond allocated memory, leading to a system crash and a denial of service.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: net: sched: act_csum: validate nested VLAN headers", "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": [ "BaseOS-8.6.0.Z.AUS:bpftool-0:4.18.0-372.201.1.el8_6.x86_64", "BaseOS-8.6.0.Z.AUS:bpftool-debuginfo-0:4.18.0-372.201.1.el8_6.x86_64", "BaseOS-8.6.0.Z.AUS:kernel-0:4.18.0-372.201.1.el8_6.src", "BaseOS-8.6.0.Z.AUS:kernel-0:4.18.0-372.201.1.el8_6.x86_64", "BaseOS-8.6.0.Z.AUS:kernel-abi-stablelists-0:4.18.0-372.201.1.el8_6.noarch", "BaseOS-8.6.0.Z.AUS:kernel-core-0:4.18.0-372.201.1.el8_6.x86_64", 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"category": "impact", "details": "Moderate" } ], "title": "kernel: net: sched: act_csum: validate nested VLAN headers" }, { "cve": "CVE-2026-43027", "cwe": { "id": "CWE-459", "name": "Incomplete Cleanup" }, "discovery_date": "2026-05-01T00:00:00+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2464369" } ], "notes": [ { "category": "description", "text": "A flaw was found in the Linux kernel's netfilter subsystem, specifically within the `nf_conntrack_helper`. When a connection tracking helper is unregistered, its associated expectations are not properly cleaned up. This oversight can lead to a use-after-free vulnerability, where the system attempts to access memory that has already been released. A local attacker could exploit this to cause a system crash, resulting in a Denial of Service (DoS), or potentially achieve privilege escalation.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: netfilter: nf_conntrack_helper: pass helper to expect cleanup", "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": [ "BaseOS-8.6.0.Z.AUS:bpftool-0:4.18.0-372.201.1.el8_6.x86_64", "BaseOS-8.6.0.Z.AUS:bpftool-debuginfo-0:4.18.0-372.201.1.el8_6.x86_64", "BaseOS-8.6.0.Z.AUS:kernel-0:4.18.0-372.201.1.el8_6.src", "BaseOS-8.6.0.Z.AUS:kernel-0:4.18.0-372.201.1.el8_6.x86_64", "BaseOS-8.6.0.Z.AUS:kernel-abi-stablelists-0:4.18.0-372.201.1.el8_6.noarch", 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"category": "impact", "details": "Moderate" } ], "title": "kernel: netfilter: nf_conntrack_helper: pass helper to expect cleanup" }, { "cve": "CVE-2026-43499", "cwe": { "id": "CWE-825", "name": "Expired Pointer Dereference" }, "discovery_date": "2026-05-21T00:00:00+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2480453" } ], "notes": [ { "category": "description", "text": "A flaw was found in the Linux kernel. When the kernel's real-time mutex (rtmutex) component performs a specific operation called 'proxy-lock rollback' during futex requeue, it incorrectly handles task pointers. This can lead to a 'Use-After-Free' (UAF) vulnerability, where the system attempts to use memory that has already been released. A local attacker could potentially exploit this to gain elevated privileges or execute unauthorized code.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: rtmutex: Use waiter::task instead of current in remove_waiter()", "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": [ "BaseOS-8.6.0.Z.AUS:bpftool-0:4.18.0-372.201.1.el8_6.x86_64", "BaseOS-8.6.0.Z.AUS:bpftool-debuginfo-0:4.18.0-372.201.1.el8_6.x86_64", "BaseOS-8.6.0.Z.AUS:kernel-0:4.18.0-372.201.1.el8_6.src", "BaseOS-8.6.0.Z.AUS:kernel-0:4.18.0-372.201.1.el8_6.x86_64", "BaseOS-8.6.0.Z.AUS:kernel-abi-stablelists-0:4.18.0-372.201.1.el8_6.noarch", "BaseOS-8.6.0.Z.AUS:kernel-core-0:4.18.0-372.201.1.el8_6.x86_64", 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A race condition exists between the handling of an Initialization Connection Request (ICReq) and the teardown of a queue. A remote attacker, by sending an ICReq and immediately closing the connection, could trigger a double free vulnerability. This could lead to a denial of service (DoS) due to memory corruption.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: nvmet-tcp: fix race between ICReq handling and queue teardown", "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": [ "BaseOS-8.6.0.Z.AUS:bpftool-0:4.18.0-372.201.1.el8_6.x86_64", "BaseOS-8.6.0.Z.AUS:bpftool-debuginfo-0:4.18.0-372.201.1.el8_6.x86_64", "BaseOS-8.6.0.Z.AUS:kernel-0:4.18.0-372.201.1.el8_6.src", "BaseOS-8.6.0.Z.AUS:kernel-0:4.18.0-372.201.1.el8_6.x86_64", "BaseOS-8.6.0.Z.AUS:kernel-abi-stablelists-0:4.18.0-372.201.1.el8_6.noarch", "BaseOS-8.6.0.Z.AUS:kernel-core-0:4.18.0-372.201.1.el8_6.x86_64", 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"category": "impact", "details": "Moderate" } ], "title": "kernel: nvmet-tcp: fix race between ICReq handling and queue teardown" }, { "cve": "CVE-2026-46189", "cwe": { "id": "CWE-763", "name": "Release of Invalid Pointer or Reference" }, "discovery_date": "2026-05-28T00:00:00+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2482588" } ], "notes": [ { "category": "description", "text": "A flaw was found in the Linux kernel, specifically within the RDMA (Remote Direct Memory Access) vmw_pvrdma module. This vulnerability is a double free, which means the system attempts to release the same memory resource twice. This can occur in an error handling path within the `pvrdma_alloc_ucontext()` function. Exploiting this flaw could lead to memory corruption or cause the system to become unavailable, resulting in a denial of service (DoS).", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: RDMA/vmw_pvrdma: Fix double free on pvrdma_alloc_ucontext() error path", "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": [ "BaseOS-8.6.0.Z.AUS:bpftool-0:4.18.0-372.201.1.el8_6.x86_64", "BaseOS-8.6.0.Z.AUS:bpftool-debuginfo-0:4.18.0-372.201.1.el8_6.x86_64", "BaseOS-8.6.0.Z.AUS:kernel-0:4.18.0-372.201.1.el8_6.src", "BaseOS-8.6.0.Z.AUS:kernel-0:4.18.0-372.201.1.el8_6.x86_64", "BaseOS-8.6.0.Z.AUS:kernel-abi-stablelists-0:4.18.0-372.201.1.el8_6.noarch", 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This vulnerability arises from an inconsistent calculation of plane dimensions, which can lead to incorrect memory allocation checks. A local attacker could exploit this by creating a specially crafted Graphics Execution Manager (GEM) object that bypasses security validations. This could allow the GPU to access memory outside its designated area, potentially leading to memory corruption, information disclosure, or the execution of unauthorized code.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: drm/gem: Fix inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs()", "title": "Vulnerability summary" }, { "category": "other", "text": "A Moderate flaw was found in the Linux kernel's Direct Rendering Manager (DRM) Graphics Execution Manager (GEM) component. This vulnerability allows a local attacker to craft a GEM object that bypasses memory allocation checks due to inconsistent plane dimension calculations. Successful exploitation could lead to memory corruption, information disclosure, or arbitrary code execution by enabling the GPU to access memory beyond allocated bounds.", "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-8.6.0.Z.AUS:bpftool-0:4.18.0-372.201.1.el8_6.x86_64", "BaseOS-8.6.0.Z.AUS:bpftool-debuginfo-0:4.18.0-372.201.1.el8_6.x86_64", "BaseOS-8.6.0.Z.AUS:kernel-0:4.18.0-372.201.1.el8_6.src", "BaseOS-8.6.0.Z.AUS:kernel-0:4.18.0-372.201.1.el8_6.x86_64", "BaseOS-8.6.0.Z.AUS:kernel-abi-stablelists-0:4.18.0-372.201.1.el8_6.noarch", "BaseOS-8.6.0.Z.AUS:kernel-core-0:4.18.0-372.201.1.el8_6.x86_64", "BaseOS-8.6.0.Z.AUS:kernel-debug-0:4.18.0-372.201.1.el8_6.x86_64", 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"category": "impact", "details": "Moderate" } ], "title": "kernel: drm/gem: Fix inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs()" }, { "cve": "CVE-2026-53166", "cwe": { "id": "CWE-476", "name": "NULL Pointer Dereference" }, "discovery_date": "2026-06-25T00:00:00+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2492805" } ], "notes": [ { "category": "description", "text": "A flaw was found in the Linux kernel's futex (Fast Userspace Mutex) requeue mechanism. When a non-top waiter attempts to requeue a Priority Inheritance (PI) futex it already owns, a NULL pointer dereference can occur. This issue, specifically within the `remove_waiter()` function during a self-deadlock scenario, leads to a kernel crash, resulting in a Denial of Service (DoS).", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: futex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock", "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": [ "BaseOS-8.6.0.Z.AUS:bpftool-0:4.18.0-372.201.1.el8_6.x86_64", "BaseOS-8.6.0.Z.AUS:bpftool-debuginfo-0:4.18.0-372.201.1.el8_6.x86_64", "BaseOS-8.6.0.Z.AUS:kernel-0:4.18.0-372.201.1.el8_6.src", "BaseOS-8.6.0.Z.AUS:kernel-0:4.18.0-372.201.1.el8_6.x86_64", 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