{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2022-48976", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-08-22T01:27:53.632Z", "datePublished": "2024-10-21T20:05:55.739Z", "dateUpdated": "2026-05-11T18:50:47.962Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T18:50:47.962Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: flowtable_offload: fix using __this_cpu_add in preemptible\n\nflow_offload_queue_work() can be called in workqueue without\nbh disabled, like the call trace showed in my act_ct testing,\ncalling NF_FLOW_TABLE_STAT_INC() there would cause a call\ntrace:\n\n BUG: using __this_cpu_add() in preemptible [00000000] code: kworker/u4:0/138560\n caller is flow_offload_queue_work+0xec/0x1b0 [nf_flow_table]\n Workqueue: act_ct_workqueue tcf_ct_flow_table_cleanup_work [act_ct]\n Call Trace:\n <TASK>\n dump_stack_lvl+0x33/0x46\n check_preemption_disabled+0xc3/0xf0\n flow_offload_queue_work+0xec/0x1b0 [nf_flow_table]\n nf_flow_table_iterate+0x138/0x170 [nf_flow_table]\n nf_flow_table_free+0x140/0x1a0 [nf_flow_table]\n tcf_ct_flow_table_cleanup_work+0x2f/0x2b0 [act_ct]\n process_one_work+0x6a3/0x1030\n worker_thread+0x8a/0xdf0\n\nThis patch fixes it by using NF_FLOW_TABLE_STAT_INC_ATOMIC()\ninstead in flow_offload_queue_work().\n\nNote that for FLOW_CLS_REPLACE branch in flow_offload_queue_work(),\nit may not be called in preemptible path, but it's good to use\nNF_FLOW_TABLE_STAT_INC_ATOMIC() for all cases in\nflow_offload_queue_work()."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/nf_flow_table_offload.c"], "versions": [{"version": "b038177636f83bbf87c2b238706474145dd2cd04", "lessThan": "a220a11fda012fba506b35929672374c2723ae6d", "status": "affected", "versionType": "git"}, {"version": "b038177636f83bbf87c2b238706474145dd2cd04", "lessThan": "a81047154e7ce4eb8769d5d21adcbc9693542a79", "status": "affected", "versionType": "git"}, {"version": "5345d78ae64d5a760c211cd2da995dc71c5b29e4", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/nf_flow_table_offload.c"], "versions": [{"version": "6.0", "status": "affected"}, {"version": "0", "lessThan": "6.0", "status": "unaffected", "versionType": "semver"}, {"version": "6.0.13", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.0.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.157"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/a220a11fda012fba506b35929672374c2723ae6d"}, {"url": "https://git.kernel.org/stable/c/a81047154e7ce4eb8769d5d21adcbc9693542a79"}], "title": "netfilter: flowtable_offload: fix using __this_cpu_add in preemptible", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2022-48976", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-10-22T13:18:28.477565Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-22T13:18:44.516Z"}}]}}

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{"affected_release": [{"advisory": "RHSA-2023:2458", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-284.11.1.el9_2", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2023-05-09T00:00:00Z"}, {"advisory": "RHSA-2023:2458", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-284.11.1.el9_2", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2023-05-09T00:00:00Z"}], "bugzilla": {"description": "kernel: netfilter: flowtable_offload: fix using __this_cpu_add in preemptible", "id": "2320792", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2320792"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-362", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnetfilter: flowtable_offload: fix using __this_cpu_add in preemptible\nflow_offload_queue_work() can be called in workqueue without\nbh disabled, like the call trace showed in my act_ct testing,\ncalling NF_FLOW_TABLE_STAT_INC() there would cause a call\ntrace:\nBUG: using __this_cpu_add() in preemptible [00000000] code: kworker/u4:0/138560\ncaller is flow_offload_queue_work+0xec/0x1b0 [nf_flow_table]\nWorkqueue: act_ct_workqueue tcf_ct_flow_table_cleanup_work [act_ct]\nCall Trace:\n<TASK>\ndump_stack_lvl+0x33/0x46\ncheck_preemption_disabled+0xc3/0xf0\nflow_offload_queue_work+0xec/0x1b0 [nf_flow_table]\nnf_flow_table_iterate+0x138/0x170 [nf_flow_table]\nnf_flow_table_free+0x140/0x1a0 [nf_flow_table]\ntcf_ct_flow_table_cleanup_work+0x2f/0x2b0 [act_ct]\nprocess_one_work+0x6a3/0x1030\nworker_thread+0x8a/0xdf0\nThis patch fixes it by using NF_FLOW_TABLE_STAT_INC_ATOMIC()\ninstead in flow_offload_queue_work().\nNote that for FLOW_CLS_REPLACE branch in flow_offload_queue_work(),\nit may not be called in preemptible path, but it's good to use\nNF_FLOW_TABLE_STAT_INC_ATOMIC() for all cases in\nflow_offload_queue_work()."], "name": "CVE-2022-48976", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-10-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-48976\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-48976\nhttps://lore.kernel.org/linux-cve-announce/2024102145-CVE-2022-48976-2980@gregkh/T"], "statement": "This issue is fixed in RHEL-9.2 and above:\n~~~\nin (rhel-9.2, rhel-9.3, rhel-9.4, rhel-9.5, rhel-9.6) netfilter: flowtable_offload: fix using __this_cpu_add in preemptible\n~~~\nPlease note that while RHEL-9 kernel-rt still appears as affected, it has been fixed in the same RHSA as RHEL-9 kernel. This is because from RHEL-9.3 onwards, the kernel and kernel-rt fixes are bundled together in a single errata.", "threat_severity": "Moderate"}

{}