CVE-2025-38212 (GCVE-0-2025-38212)
Vulnerability from cvelistv5
Published
2025-07-04 13:37
Modified
2025-07-28 04:15
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ipc: fix to protect IPCS lookups using RCU syzbot reported that it discovered a use-after-free vulnerability, [0] [0]: https://lore.kernel.org/all/67af13f8.050a0220.21dd3.0038.GAE@google.com/ idr_for_each() is protected by rwsem, but this is not enough. If it is not protected by RCU read-critical region, when idr_for_each() calls radix_tree_node_free() through call_rcu() to free the radix_tree_node structure, the node will be freed immediately, and when reading the next node in radix_tree_for_each_slot(), the already freed memory may be read. Therefore, we need to add code to make sure that idr_for_each() is protected within the RCU read-critical region when we call it in shm_destroy_orphaned().
References
Impacted products
Vendor Product Version
Linux Linux Version: b34a6b1da371ed8af1221459a18c67970f7e3d53
Version: b34a6b1da371ed8af1221459a18c67970f7e3d53
Version: b34a6b1da371ed8af1221459a18c67970f7e3d53
Version: b34a6b1da371ed8af1221459a18c67970f7e3d53
Version: b34a6b1da371ed8af1221459a18c67970f7e3d53
Version: b34a6b1da371ed8af1221459a18c67970f7e3d53
Version: b34a6b1da371ed8af1221459a18c67970f7e3d53
Version: b34a6b1da371ed8af1221459a18c67970f7e3d53
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "ipc/shm.c"
          ],
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "6.6.95",
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              "version": "6.15.4",
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              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipc: fix to protect IPCS lookups using RCU\n\nsyzbot reported that it discovered a use-after-free vulnerability, [0]\n\n[0]: https://lore.kernel.org/all/67af13f8.050a0220.21dd3.0038.GAE@google.com/\n\nidr_for_each() is protected by rwsem, but this is not enough.  If it is\nnot protected by RCU read-critical region, when idr_for_each() calls\nradix_tree_node_free() through call_rcu() to free the radix_tree_node\nstructure, the node will be freed immediately, and when reading the next\nnode in radix_tree_for_each_slot(), the already freed memory may be read.\n\nTherefore, we need to add code to make sure that idr_for_each() is\nprotected within the RCU read-critical region when we call it in\nshm_destroy_orphaned()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T04:15:19.169Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5f1e1573bf103303944fd7225559de5d8297539c"
        },
        {
          "url": "https://git.kernel.org/stable/c/b968ba8bfd9f90914957bbbd815413bf6a98eca7"
        },
        {
          "url": "https://git.kernel.org/stable/c/74bc813d11c30e28fc5261dc877cca662ccfac68"
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          "url": "https://git.kernel.org/stable/c/78297d53d3878d43c1d627d20cd09f611fa4b91d"
        },
        {
          "url": "https://git.kernel.org/stable/c/5180561afff8e0f029073c8c8117c95c6512d1f9"
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          "url": "https://git.kernel.org/stable/c/68c173ea138b66d7dd1fd980c9bc578a18e11884"
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          "url": "https://git.kernel.org/stable/c/b0b6bf90ce2699a574b3683e22c44d0dcdd7a057"
        },
        {
          "url": "https://git.kernel.org/stable/c/d66adabe91803ef34a8b90613c81267b5ded1472"
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      ],
      "title": "ipc: fix to protect IPCS lookups using RCU",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38212",
    "datePublished": "2025-07-04T13:37:30.957Z",
    "dateReserved": "2025-04-16T04:51:23.994Z",
    "dateUpdated": "2025-07-28T04:15:19.169Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38212\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-04T14:15:29.473\",\"lastModified\":\"2025-07-08T16:18:53.607\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nipc: fix to protect IPCS lookups using RCU\\n\\nsyzbot reported that it discovered a use-after-free vulnerability, [0]\\n\\n[0]: https://lore.kernel.org/all/67af13f8.050a0220.21dd3.0038.GAE@google.com/\\n\\nidr_for_each() is protected by rwsem, but this is not enough.  If it is\\nnot protected by RCU read-critical region, when idr_for_each() calls\\nradix_tree_node_free() through call_rcu() to free the radix_tree_node\\nstructure, the node will be freed immediately, and when reading the next\\nnode in radix_tree_for_each_slot(), the already freed memory may be read.\\n\\nTherefore, we need to add code to make sure that idr_for_each() is\\nprotected within the RCU read-critical region when we call it in\\nshm_destroy_orphaned().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ipc: correcci\u00f3n para proteger las b\u00fasquedas IPCS mediante RCU. syzbot inform\u00f3 del descubrimiento de una vulnerabilidad de use-after-free, [0] [0]: https://lore.kernel.org/all/67af13f8.050a0220.21dd3.0038.GAE@google.com/ idr_for_each() est\u00e1 protegido por rwsem, pero esto no es suficiente. Si no est\u00e1 protegido por la regi\u00f3n cr\u00edtica de lectura de RCU, cuando idr_for_each() llama a radix_tree_node_free() mediante call_rcu() para liberar la estructura radix_tree_node, el nodo se liberar\u00e1 inmediatamente y, al leer el siguiente nodo en radix_tree_for_each_slot(), se podr\u00e1 leer la memoria ya liberada. Por lo tanto, necesitamos agregar c\u00f3digo para asegurarnos de que idr_for_each() est\u00e9 protegido dentro de la regi\u00f3n cr\u00edtica de lectura de RCU cuando lo llamamos en shm_destroy_orphaned().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5180561afff8e0f029073c8c8117c95c6512d1f9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5f1e1573bf103303944fd7225559de5d8297539c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/68c173ea138b66d7dd1fd980c9bc578a18e11884\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/74bc813d11c30e28fc5261dc877cca662ccfac68\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/78297d53d3878d43c1d627d20cd09f611fa4b91d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b0b6bf90ce2699a574b3683e22c44d0dcdd7a057\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b968ba8bfd9f90914957bbbd815413bf6a98eca7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d66adabe91803ef34a8b90613c81267b5ded1472\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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