CVE-2024-53211 (GCVE-0-2024-53211)
Vulnerability from cvelistv5
Published
2024-12-27 13:49
Modified
2025-05-04 09:56
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net/l2tp: fix warning in l2tp_exit_net found by syzbot In l2tp's net exit handler, we check that an IDR is empty before destroying it: WARN_ON_ONCE(!idr_is_empty(&pn->l2tp_tunnel_idr)); idr_destroy(&pn->l2tp_tunnel_idr); By forcing memory allocation failures in idr_alloc_32, syzbot is able to provoke a condition where idr_is_empty returns false despite there being no items in the IDR. This turns out to be because the radix tree of the IDR contains only internal radix-tree nodes and it is this that causes idr_is_empty to return false. The internal nodes are cleaned by idr_destroy. Use idr_for_each to check that the IDR is empty instead of idr_is_empty to avoid the problem.
References
Impacted products
Vendor Product Version
Linux Linux Version: 73d33bd063c4cfef3db17f9bec3d202928ed8631
Version: 73d33bd063c4cfef3db17f9bec3d202928ed8631
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/l2tp/l2tp_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a487cc8986d6dd75b60b59004f3bd2ea9b4dd541",
              "status": "affected",
              "version": "73d33bd063c4cfef3db17f9bec3d202928ed8631",
              "versionType": "git"
            },
            {
              "lessThan": "5d066766c5f1252f98ff859265bcd1a5b52ac46c",
              "status": "affected",
              "version": "73d33bd063c4cfef3db17f9bec3d202928ed8631",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/l2tp/l2tp_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "lessThan": "6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.2",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/l2tp: fix warning in l2tp_exit_net found by syzbot\n\nIn l2tp\u0027s net exit handler, we check that an IDR is empty before\ndestroying it:\n\n\tWARN_ON_ONCE(!idr_is_empty(\u0026pn-\u003el2tp_tunnel_idr));\n\tidr_destroy(\u0026pn-\u003el2tp_tunnel_idr);\n\nBy forcing memory allocation failures in idr_alloc_32, syzbot is able\nto provoke a condition where idr_is_empty returns false despite there\nbeing no items in the IDR. This turns out to be because the radix tree\nof the IDR contains only internal radix-tree nodes and it is this that\ncauses idr_is_empty to return false. The internal nodes are cleaned by\nidr_destroy.\n\nUse idr_for_each to check that the IDR is empty instead of\nidr_is_empty to avoid the problem."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T09:56:00.933Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a487cc8986d6dd75b60b59004f3bd2ea9b4dd541"
        },
        {
          "url": "https://git.kernel.org/stable/c/5d066766c5f1252f98ff859265bcd1a5b52ac46c"
        }
      ],
      "title": "net/l2tp: fix warning in l2tp_exit_net found by syzbot",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-53211",
    "datePublished": "2024-12-27T13:49:57.169Z",
    "dateReserved": "2024-11-19T17:17:25.020Z",
    "dateUpdated": "2025-05-04T09:56:00.933Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-53211\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-12-27T14:15:29.017\",\"lastModified\":\"2024-12-27T14:15:29.017\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/l2tp: fix warning in l2tp_exit_net found by syzbot\\n\\nIn l2tp\u0027s net exit handler, we check that an IDR is empty before\\ndestroying it:\\n\\n\\tWARN_ON_ONCE(!idr_is_empty(\u0026pn-\u003el2tp_tunnel_idr));\\n\\tidr_destroy(\u0026pn-\u003el2tp_tunnel_idr);\\n\\nBy forcing memory allocation failures in idr_alloc_32, syzbot is able\\nto provoke a condition where idr_is_empty returns false despite there\\nbeing no items in the IDR. This turns out to be because the radix tree\\nof the IDR contains only internal radix-tree nodes and it is this that\\ncauses idr_is_empty to return false. The internal nodes are cleaned by\\nidr_destroy.\\n\\nUse idr_for_each to check that the IDR is empty instead of\\nidr_is_empty to avoid the problem.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/l2tp: correcci\u00f3n de advertencia en l2tp_exit_net encontrada por syzbot En el controlador de salida de red de l2tp, verificamos que un IDR est\u00e9 vac\u00edo antes de destruirlo: WARN_ON_ONCE(!idr_is_empty(\u0026amp;pn-\u0026gt;l2tp_tunnel_idr)); idr_destroy(\u0026amp;pn-\u0026gt;l2tp_tunnel_idr); Al forzar fallas de asignaci\u00f3n de memoria en idr_alloc_32, syzbot puede provocar una condici\u00f3n donde idr_is_empty devuelve falso a pesar de que no haya elementos en el IDR. Esto resulta ser porque el \u00e1rbol de radix del IDR contiene solo nodos de \u00e1rbol de radix internos y es esto lo que hace que idr_is_empty devuelva falso. Los nodos internos son limpiados por idr_destroy. Utilice idr_for_each para verificar que el IDR est\u00e9 vac\u00edo en lugar de idr_is_empty para evitar el problema.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5d066766c5f1252f98ff859265bcd1a5b52ac46c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a487cc8986d6dd75b60b59004f3bd2ea9b4dd541\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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