CVE-2024-56655 (GCVE-0-2024-56655)

Vulnerability from cvelistv5 – Published: 2024-12-27 15:06 – Updated: 2026-08-05 11:45
VLAI
Title
netfilter: nf_tables: do not defer rule destruction via call_rcu
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: do not defer rule destruction via call_rcu nf_tables_chain_destroy can sleep, it can't be used from call_rcu callbacks. Moreover, nf_tables_rule_release() is only safe for error unwinding, while transaction mutex is held and the to-be-desroyed rule was not exposed to either dataplane or dumps, as it deactives+frees without the required synchronize_rcu() in-between. nft_rule_expr_deactivate() callbacks will change ->use counters of other chains/sets, see e.g. nft_lookup .deactivate callback, these must be serialized via transaction mutex. Also add a few lockdep asserts to make this more explicit. Calling synchronize_rcu() isn't ideal, but fixing this without is hard and way more intrusive. As-is, we can get: WARNING: .. net/netfilter/nf_tables_api.c:5515 nft_set_destroy+0x.. Workqueue: events nf_tables_trans_destroy_work RIP: 0010:nft_set_destroy+0x3fe/0x5c0 Call Trace: <TASK> nf_tables_trans_destroy_work+0x6b7/0xad0 process_one_work+0x64a/0xce0 worker_thread+0x613/0x10d0 In case the synchronize_rcu becomes an issue, we can explore alternatives. One way would be to allocate nft_trans_rule objects + one nft_trans_chain object, deactivate the rules + the chain and then defer the freeing to the nft destroy workqueue. We'd still need to keep the synchronize_rcu path as a fallback to handle -ENOMEM corner cases though.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6666 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9eee6097ffb26cdd2adb988c0d378fa0d650c737 , < 5146c27b2780aac59876a887a5f4e793b8949862 (git)
Affected: 558f503f707f481bbf40efa74a938b8021df841d , < 2991dc357a28b61c13ed1f7b59e9251e2b4562fb (git)
Affected: a394c160d57f4b083bd904a22802f6fb7f5b3cea , < b8d8f53e1858178882b881b8c09f94ef0e83bf76 (git)
Affected: e6c32a64d61184c2bdf89442b3d31ef530afba34 , < b0f013bebf94fe7ae75e5a53be2f2bd1cc1841e3 (git)
Affected: bfd05c68e4c6320304e9f371ffa356b6e4b9cc53 , < 27f0574253f6c24c8ee4e3f0a685b75ed3a256ed (git)
Affected: c03d278fdf35e73dd0ec543b9b556876b9d9a8dc , < 7cf0bd232b565d9852cb25fd094f77254773e048 (git)
Affected: c03d278fdf35e73dd0ec543b9b556876b9d9a8dc , < b04df3da1b5c6f6dc7cdccc37941740c078c4043 (git)
Affected: cb401e5799e0acacb405f2128097e9c4ccf82f8a (git)
Affected: 6.6.61 , < 6.6.67 (semver)
Affected: 6.11.8 , < 6.12 (semver)
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Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 6.6.67 , ≤ 6.6.* (semver)
Unaffected: 6.12.6 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: nf_tables: no aplazar la destrucci\u00f3n de la regla mediante call_rcu nf_tables_chain_destroy puede dormir, no se puede utilizar desde las devoluciones de llamadas call_rcu. Adem\u00e1s, nf_tables_rule_release() solo es seguro para desenrollar errores, mientras se mantiene el mutex de transacci\u00f3n y la regla a destruir no se expuso ni al plano de datos ni a los volcados, ya que desactiva + libera sin elsynchronous_rcu() requerido en el medio. Las devoluciones de llamadas nft_rule_expr_deactivate() cambiar\u00e1n -\u0026gt;use contadores de otras cadenas/conjuntos, consulte, por ejemplo, la devoluci\u00f3n de llamada nft_lookup .deactivate, que se deben serializar mediante el mutex de transacci\u00f3n. Agregue tambi\u00e9n algunas afirmaciones lockdep para que esto sea m\u00e1s expl\u00edcito. Llamar asynchronous_rcu() no es ideal, pero solucionar esto sin \u00e9l es dif\u00edcil y mucho m\u00e1s intrusivo. Tal como est\u00e1, podemos obtener: ADVERTENCIA: .. net/netfilter/nf_tables_api.c:5515 nft_set_destroy+0x.. Cola de trabajo: eventos nf_tables_trans_destroy_work RIP: 0010:nft_set_destroy+0x3fe/0x5c0 Rastreo de llamadas:  nf_tables_trans_destroy_work+0x6b7/0xad0 process_one_work+0x64a/0xce0 worker_thread+0x613/0x10d0 En caso de que elsynchronous_rcu se convierta en un problema, podemos explorar alternativas. Una forma ser\u00eda asignar objetos nft_trans_rule + un objeto nft_trans_chain, desactivar las reglas + la cadena y luego diferir la liberaci\u00f3n a la cola de trabajo de destrucci\u00f3n de nft. A\u00fan as\u00ed, necesitar\u00edamos mantener la ruta synchronization_rcu como respaldo para gestionar casos especiales de -ENOMEM."
          }
        ],
        "id": "CVE-2024-56655",
        "lastModified": "2026-08-04T11:22:18.720",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            },
            {
              "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",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2024-12-27T15:15:25.343",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/27f0574253f6c24c8ee4e3f0a685b75ed3a256ed"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2991dc357a28b61c13ed1f7b59e9251e2b4562fb"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5146c27b2780aac59876a887a5f4e793b8949862"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/7cf0bd232b565d9852cb25fd094f77254773e048"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/b04df3da1b5c6f6dc7cdccc37941740c078c4043"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b0f013bebf94fe7ae75e5a53be2f2bd1cc1841e3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b8d8f53e1858178882b881b8c09f94ef0e83bf76"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T03:52:56+00:00",
      "cve": "CVE-2024-56655",
      "id": "CVE-2024-56655",
      "initial_release_date": "2024-12-27T00:00:00+00:00",
      "product_status:known_affected": "28",
      "product_status:known_not_affected": "170",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: nf_tables: do not defer rule destruction via call_rcu",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-56655.json",
      "version": "3"
    }
  }
}



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