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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)
guessed Create a notification for this product.
Show details on NVD website
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            "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()."
          }
        ],
        "id": "CVE-2022-48976",
        "lastModified": "2026-06-17T05:16:45.510",
        "metrics": {
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              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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              "source": "nvd@nist.gov",
              "type": "Primary"
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      "current_release_date": "2025-11-21T14:23:37+00:00",
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      "product_status:known_affected": "22",
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      "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",
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      "current_release_date": "2026-09-01T01:28:53Z",
      "cve": "CVE-2022-48976",
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      "product_status:known_not_affected": "498",
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      "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": {
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            "metrics": [
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                    "options": [
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              "shortName": "CISA-ADP"
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            "title": "CISA ADP Vulnrichment"
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        "cna": {
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}



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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.

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  • 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.
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  • 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.


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