{ "document": { "aggregate_severity": { "text": "Important" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "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 Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/centos8.4els/vex/2022/cve-2022-50000-els_os-centos8_4els.json" } ], "title": "Security update on CVE-2022-50000", "tracking": { "current_release_date": "2025-12-23T22:15:38Z", "generator": { "date": "2025-12-23T22:15:38Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2022-50000-ELS_OS-CENTOS8.4ELS", "initial_release_date": "2022-01-01T00:00:00Z", "revision_history": [ { "date": "2022-01-01T00:00:00Z", "number": "1", "summary": "Initial version" }, { "date": "2025-08-07T07:55:41Z", "number": "2", "summary": "Official Publication" }, { "date": "2025-12-23T22:15:38Z", "number": "3", "summary": "Update document" } ], "status": "final", "version": "2" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Community Enterprise Operating System 8.4", "product": { "name": "Community Enterprise Operating System 8.4", "product_id": "CentOS-8.4", "product_identification_helper": { "cpe": "cpe:2.3:o:centos:centos:8.4:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "Community Enterprise Operating System" } ], "category": "vendor", "name": "Red Hat, Inc." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "kernel-debug-modules-extra-0:4.18.0-305.25.1.el8_4.tuxcare.els30.x86_64", "product": { "name": "kernel-debug-modules-extra-0:4.18.0-305.25.1.el8_4.tuxcare.els30.x86_64", "product_id": "kernel-debug-modules-extra-0:4.18.0-305.25.1.el8_4.tuxcare.els30.x86_64", "product_identification_helper": { "purl": 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Community Enterprise Operating System 8.4", "product_id": "CentOS-8.4:kernel-ipaclones-internal-0:4.18.0-305.25.1.el8_4.tuxcare.els30.x86_64" }, "product_reference": "kernel-ipaclones-internal-0:4.18.0-305.25.1.el8_4.tuxcare.els30.x86_64", "relates_to_product_reference": "CentOS-8.4" }, { "category": "default_component_of", "full_product_name": { "name": "kernel-0:4.18.0-305.25.1.el8_4.tuxcare.els30.x86_64 as a component of Community Enterprise Operating System 8.4", "product_id": "CentOS-8.4:kernel-0:4.18.0-305.25.1.el8_4.tuxcare.els30.x86_64" }, "product_reference": "kernel-0:4.18.0-305.25.1.el8_4.tuxcare.els30.x86_64", "relates_to_product_reference": "CentOS-8.4" }, { "category": "default_component_of", "full_product_name": { "name": "kernel-headers-0:4.18.0-305.25.1.el8_4.tuxcare.els30.x86_64 as a component of Community Enterprise Operating System 8.4", "product_id": "CentOS-8.4:kernel-headers-0:4.18.0-305.25.1.el8_4.tuxcare.els30.x86_64" }, "product_reference": "kernel-headers-0:4.18.0-305.25.1.el8_4.tuxcare.els30.x86_64", "relates_to_product_reference": "CentOS-8.4" }, { "category": "default_component_of", "full_product_name": { "name": "perf-0:4.18.0-305.25.1.el8_4.tuxcare.els30.x86_64 as a component of Community Enterprise Operating System 8.4", "product_id": "CentOS-8.4:perf-0:4.18.0-305.25.1.el8_4.tuxcare.els30.x86_64" }, "product_reference": "perf-0:4.18.0-305.25.1.el8_4.tuxcare.els30.x86_64", "relates_to_product_reference": "CentOS-8.4" } ] }, "vulnerabilities": [ { "cve": "CVE-2022-50000", "cwe": { "id": "CWE-820", "name": "Missing Synchronization" }, "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\nnetfilter: flowtable: fix stuck flows on cleanup due to pending work\nTo clear the flow table on flow table free, the following sequence\nnormally happens in order:\n1) gc_step work is stopped to disable any further stats/del requests.\n2) All flow table entries are set to teardown state.\n3) Run gc_step which will queue HW del work for each flow table entry.\n4) Waiting for the above del work to finish (flush).\n5) Run gc_step again, deleting all entries from the flow table.\n6) Flow table is freed.\nBut if a flow table entry already has pending HW stats or HW add work\nstep 3 will not queue HW del work (it will be skipped), step 4 will wait\nfor the pending add/stats to finish, and step 5 will queue HW del work\nwhich might execute after freeing of the flow table.\nTo fix the above, this patch flushes the pending work, then it sets the\nteardown flag to all flows in the flowtable and it forces a garbage\ncollector run to queue work to remove the flows from hardware, then it\nflushes this new pending work and (finally) it forces another garbage\ncollector run to remove the entry from the software flowtable.\nStack trace:\n[47773.882335] BUG: KASAN: use-after-free in down_read+0x99/0x460\n[47773.883634] Write of size 8 at addr ffff888103b45aa8 by task kworker/u20:6/543704\n[47773.885634] CPU: 3 PID: 543704 Comm: kworker/u20:6 Not tainted 5.12.0-rc7+ #2\n[47773.886745] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009)\n[47773.888438] Workqueue: nf_ft_offload_del flow_offload_work_handler [nf_flow_table]\n[47773.889727] Call Trace:\n[47773.890214] dump_stack+0xbb/0x107\n[47773.890818] print_address_description.constprop.0+0x18/0x140\n[47773.892990] kasan_report.cold+0x7c/0xd8\n[47773.894459] kasan_check_range+0x145/0x1a0\n[47773.895174] down_read+0x99/0x460\n[47773.899706] nf_flow_offload_tuple+0x24f/0x3c0 [nf_flow_table]\n[47773.907137] flow_offload_work_handler+0x72d/0xbe0 [nf_flow_table]\n[47773.913372] process_one_work+0x8ac/0x14e0\n[47773.921325]\n[47773.921325] Allocated by task 592159:\n[47773.922031] kasan_save_stack+0x1b/0x40\n[47773.922730] __kasan_kmalloc+0x7a/0x90\n[47773.923411] tcf_ct_flow_table_get+0x3cb/0x1230 [act_ct]\n[47773.924363] tcf_ct_init+0x71c/0x1156 [act_ct]\n[47773.925207] tcf_action_init_1+0x45b/0x700\n[47773.925987] tcf_action_init+0x453/0x6b0\n[47773.926692] tcf_exts_validate+0x3d0/0x600\n[47773.927419] fl_change+0x757/0x4a51 [cls_flower]\n[47773.928227] tc_new_tfilter+0x89a/0x2070\n[47773.936652]\n[47773.936652] Freed by task 543704:\n[47773.937303] kasan_save_stack+0x1b/0x40\n[47773.938039] kasan_set_track+0x1c/0x30\n[47773.938731] kasan_set_free_info+0x20/0x30\n[47773.939467] __kasan_slab_free+0xe7/0x120\n[47773.940194] slab_free_freelist_hook+0x86/0x190\n[47773.941038] kfree+0xce/0x3a0\n[47773.941644] tcf_ct_flow_table_cleanup_work\nOriginal patch description and stack trace by Paul Blakey.", "title": "Vulnerability description" }, { "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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"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" }, "products": [ "CentOS-8.4:kernel-debug-modules-extra-0:4.18.0-305.25.1.el8_4.tuxcare.els30.x86_64", "CentOS-8.4:python3-perf-0:4.18.0-305.25.1.el8_4.tuxcare.els30.x86_64", "CentOS-8.4:kernel-modules-internal-0:4.18.0-305.25.1.el8_4.tuxcare.els30.x86_64", "CentOS-8.4:kernel-modules-0:4.18.0-305.25.1.el8_4.tuxcare.els30.x86_64", "CentOS-8.4:kernel-tools-libs-devel-0:4.18.0-305.25.1.el8_4.tuxcare.els30.x86_64", "CentOS-8.4:kernel-core-0:4.18.0-305.25.1.el8_4.tuxcare.els30.x86_64", "CentOS-8.4:bpftool-0:4.18.0-305.25.1.el8_4.tuxcare.els30.x86_64", "CentOS-8.4:kernel-debug-modules-0:4.18.0-305.25.1.el8_4.tuxcare.els30.x86_64", "CentOS-8.4:kernel-debug-0:4.18.0-305.25.1.el8_4.tuxcare.els30.x86_64", 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} ], "threats": [ { "category": "impact", "details": "High" } ] } ] }