cve-2024-53211
Vulnerability from cvelistv5
Published
2024-12-27 13:49
Modified
2025-01-20 06:21
Severity ?
EPSS score ?
0.03% (0.04018)
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5d066766c5f1252f98ff859265bcd1a5b52ac46c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a487cc8986d6dd75b60b59004f3bd2ea9b4dd541
Impacted products
Vendor Product Version
Linux Linux Version: 73d33bd063c4cfef3db17f9bec3d202928ed8631
Version: 73d33bd063c4cfef3db17f9bec3d202928ed8631
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   Linux Linux Version: 6.12
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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",
                  },
               ],
            },
         ],
         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's net exit handler, we check that an IDR is empty before\ndestroying it:\n\n\tWARN_ON_ONCE(!idr_is_empty(&pn->l2tp_tunnel_idr));\n\tidr_destroy(&pn->l2tp_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: "2025-01-20T06:21:19.855Z",
            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-5f407fcff5a0",
         },
      },
   },
   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: "2025-01-20T06:21:19.855Z",
      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\":\"Received\",\"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's net exit handler, we check that an IDR is empty before\\ndestroying it:\\n\\n\\tWARN_ON_ONCE(!idr_is_empty(&pn->l2tp_tunnel_idr));\\n\\tidr_destroy(&pn->l2tp_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.\"}],\"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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