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CVE-2024-53211 (GCVE-0-2024-53211)

Vulnerability from cvelistv5 – Published: 2024-12-27 13:49 – Updated: 2026-05-11 20:52
VLAI
Title
net/l2tp: fix warning in l2tp_exit_net found by syzbot
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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 73d33bd063c4cfef3db17f9bec3d202928ed8631 , < a487cc8986d6dd75b60b59004f3bd2ea9b4dd541 (git)
Affected: 73d33bd063c4cfef3db17f9bec3d202928ed8631 , < 5d066766c5f1252f98ff859265bcd1a5b52ac46c (git)
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Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 6.12.2 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
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Show details on NVD website
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{
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          "product": "Linux",
          "programFiles": [
            "net/l2tp/l2tp_core.c"
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          "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": "2026-05-11T20:52:59.673Z",
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/5d066766c5f1252f98ff859265bcd1a5b52ac46c"
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      ],
      "title": "net/l2tp: fix warning in l2tp_exit_net found by syzbot",
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    "cveId": "CVE-2024-53211",
    "datePublished": "2024-12-27T13:49:57.169Z",
    "dateReserved": "2024-11-19T17:17:25.020Z",
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    "state": "PUBLISHED"
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                    "status": "affected",
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                    "status": "unaffected",
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        "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."
          }
        ],
        "id": "CVE-2024-53211",
        "lastModified": "2026-06-17T08:08:36.190",
        "metrics": {
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              "cvssData": {
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                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:16:24+00:00",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/l2tp: fix warning in l2tp_exit_net found by syzbot",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-53211.json",
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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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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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