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CVE-2022-48976 (GCVE-0-2022-48976)

Vulnerability from cvelistv5 – Published: 2024-10-21 20:05 – Updated: 2026-05-23 15:21
VLAI
Title
netfilter: flowtable_offload: fix using __this_cpu_add in preemptible
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable_offload: fix using __this_cpu_add in preemptible flow_offload_queue_work() can be called in workqueue without bh disabled, like the call trace showed in my act_ct testing, calling NF_FLOW_TABLE_STAT_INC() there would cause a call trace: BUG: using __this_cpu_add() in preemptible [00000000] code: kworker/u4:0/138560 caller is flow_offload_queue_work+0xec/0x1b0 [nf_flow_table] Workqueue: act_ct_workqueue tcf_ct_flow_table_cleanup_work [act_ct] Call Trace: <TASK> dump_stack_lvl+0x33/0x46 check_preemption_disabled+0xc3/0xf0 flow_offload_queue_work+0xec/0x1b0 [nf_flow_table] nf_flow_table_iterate+0x138/0x170 [nf_flow_table] nf_flow_table_free+0x140/0x1a0 [nf_flow_table] tcf_ct_flow_table_cleanup_work+0x2f/0x2b0 [act_ct] process_one_work+0x6a3/0x1030 worker_thread+0x8a/0xdf0 This patch fixes it by using NF_FLOW_TABLE_STAT_INC_ATOMIC() instead in flow_offload_queue_work(). Note that for FLOW_CLS_REPLACE branch in flow_offload_queue_work(), it may not be called in preemptible path, but it's good to use NF_FLOW_TABLE_STAT_INC_ATOMIC() for all cases in flow_offload_queue_work().
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-22 13:18 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b038177636f83bbf87c2b238706474145dd2cd04 , < a220a11fda012fba506b35929672374c2723ae6d (git)
Affected: b038177636f83bbf87c2b238706474145dd2cd04 , < a81047154e7ce4eb8769d5d21adcbc9693542a79 (git)
Affected: 5345d78ae64d5a760c211cd2da995dc71c5b29e4 (git)
Affected: 5.15.157 , < 5.16 (semver)
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Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.0.13 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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    "nvd": "{\"cve\":{\"id\":\"CVE-2022-48976\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T20:15:09.680\",\"lastModified\":\"2026-06-17T05:16:45.510\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"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   \u003cTASK\u003e\\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\u0027s good to use\\nNF_FLOW_TABLE_STAT_INC_ATOMIC() for all cases in\\nflow_offload_queue_work().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: flowtable_offload: correcci\u00f3n al usar __this_cpu_add en preemptible flow_offload_queue_work() se puede llamar en workqueue sin bh deshabilitado, como el seguimiento de llamadas que mostr\u00f3 en mi prueba act_ct, llamar a NF_FLOW_TABLE_STAT_INC() all\u00ed causar\u00eda un seguimiento de llamadas: ERROR: usar __this_cpu_add() en preemptible [00000000] c\u00f3digo: kworker/u4:0/138560 el llamador es flow_offload_queue_work+0xec/0x1b0 [nf_flow_table] Workqueue: act_ct_workqueue tcf_ct_flow_table_cleanup_work [act_ct] Seguimiento de llamadas:  dump_stack_lvl+0x33/0x46 check_preemption_disabled+0xc3/0xf0 Este parche lo corrige al usar NF_FLOW_TABLE_STAT_INC_ATOMIC() en lugar de flow_offload_queue_work(). Tenga en cuenta que para la rama FLOW_CLS_REPLACE en flow_offload_queue_work(), es posible que no se la llame en una ruta preemptible, pero es bueno usar NF_FLOW_TABLE_STAT_INC_ATOMIC() para todos los casos en flow_offload_queue_work().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/netfilter/nf_flow_table_offload.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"b038177636f83bbf87c2b238706474145dd2cd04\",\"lessThan\":\"a220a11fda012fba506b35929672374c2723ae6d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b038177636f83bbf87c2b238706474145dd2cd04\",\"lessThan\":\"a81047154e7ce4eb8769d5d21adcbc9693542a79\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5345d78ae64d5a760c211cd2da995dc71c5b29e4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.15.157\",\"lessThan\":\"5.16\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/netfilter/nf_flow_table_offload.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.0.13\",\"lessThanOrEqual\":\"6.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-10-22T13:18:28.477565Z\",\"id\":\"CVE-2022-48976\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15.157\",\"versionEndExcluding\":\"6.0.13\",\"matchCriteriaId\":\"3FC10E8F-D0FF-45C4-A8F5-7ABB6F91A19E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"8B3CE743-2126-47A3-8B7C-822B502CF119\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"4DEB27E7-30AA-45CC-8934-B89263EF3551\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"E0005AEF-856E-47EB-BFE4-90C46899394D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"39889A68-6D34-47A6-82FC-CD0BF23D6754\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"B8383ABF-1457-401F-9B61-EE50F4C61F4F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"B77A9280-37E6-49AD-B559-5B23A3B1DC3D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"DE5298B3-04B4-4F3E-B186-01A58B5C75A6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc8:*:*:*:*:*:*\",\"matchCriteriaId\":\"E9D7C49C-53E7-4B23-9AFE-DAC5A18B153A\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/a220a11fda012fba506b35929672374c2723ae6d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a81047154e7ce4eb8769d5d21adcbc9693542a79\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T14:23:37+00:00",
      "cve": "CVE-2022-48976",
      "id": "CVE-2022-48976",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:fixed": "417",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "114",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: flowtable_offload: fix using __this_cpu_add in preemptible",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-48976.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-01T01:28:53Z",
      "cve": "CVE-2022-48976",
      "id": "CVE-2022-48976",
      "initial_release_date": "2024-10-22T14:22:59Z",
      "product_status:known_not_affected": "498",
      "product_status:recommended": "27",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-48976",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-48976.json",
      "version": "19"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"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\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-22T13:18:31.596Z\"}}], \"cna\": {\"title\": \"netfilter: flowtable_offload: fix using __this_cpu_add in preemptible\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"b038177636f83bbf87c2b238706474145dd2cd04\", \"lessThan\": \"a220a11fda012fba506b35929672374c2723ae6d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b038177636f83bbf87c2b238706474145dd2cd04\", \"lessThan\": \"a81047154e7ce4eb8769d5d21adcbc9693542a79\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5345d78ae64d5a760c211cd2da995dc71c5b29e4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5.15.157\", \"lessThan\": \"5.16\", \"versionType\": \"semver\"}], \"programFiles\": [\"net/netfilter/nf_flow_table_offload.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.0\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.0\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.0.13\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.0.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/netfilter/nf_flow_table_offload.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/a220a11fda012fba506b35929672374c2723ae6d\"}, {\"url\": \"https://git.kernel.org/stable/c/a81047154e7ce4eb8769d5d21adcbc9693542a79\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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   \u003cTASK\u003e\\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\u0027s good to use\\nNF_FLOW_TABLE_STAT_INC_ATOMIC() for all cases in\\nflow_offload_queue_work().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.0.13\", \"versionStartIncluding\": \"6.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1\", \"versionStartIncluding\": \"6.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.15.157\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T15:21:14.168Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-48976\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-23T15:21:14.168Z\", \"dateReserved\": \"2024-08-22T01:27:53.632Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T20:05:55.739Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.