CVE-2023-53608 (GCVE-0-2023-53608)
Vulnerability from cvelistv5
Published
2025-10-04 15:44
Modified
2025-10-04 15:44
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix potential UAF of struct nilfs_sc_info in nilfs_segctor_thread() The finalization of nilfs_segctor_thread() can race with nilfs_segctor_kill_thread() which terminates that thread, potentially causing a use-after-free BUG as KASAN detected. At the end of nilfs_segctor_thread(), it assigns NULL to "sc_task" member of "struct nilfs_sc_info" to indicate the thread has finished, and then notifies nilfs_segctor_kill_thread() of this using waitqueue "sc_wait_task" on the struct nilfs_sc_info. However, here, immediately after the NULL assignment to "sc_task", it is possible that nilfs_segctor_kill_thread() will detect it and return to continue the deallocation, freeing the nilfs_sc_info structure before the thread does the notification. This fixes the issue by protecting the NULL assignment to "sc_task" and its notification, with spinlock "sc_state_lock" of the struct nilfs_sc_info. Since nilfs_segctor_kill_thread() does a final check to see if "sc_task" is NULL with "sc_state_lock" locked, this can eliminate the race.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "fs/nilfs2/segment.c"
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          "vendor": "Linux",
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix potential UAF of struct nilfs_sc_info in nilfs_segctor_thread()\n\nThe finalization of nilfs_segctor_thread() can race with\nnilfs_segctor_kill_thread() which terminates that thread, potentially\ncausing a use-after-free BUG as KASAN detected.\n\nAt the end of nilfs_segctor_thread(), it assigns NULL to \"sc_task\" member\nof \"struct nilfs_sc_info\" to indicate the thread has finished, and then\nnotifies nilfs_segctor_kill_thread() of this using waitqueue\n\"sc_wait_task\" on the struct nilfs_sc_info.\n\nHowever, here, immediately after the NULL assignment to \"sc_task\", it is\npossible that nilfs_segctor_kill_thread() will detect it and return to\ncontinue the deallocation, freeing the nilfs_sc_info structure before the\nthread does the notification.\n\nThis fixes the issue by protecting the NULL assignment to \"sc_task\" and\nits notification, with spinlock \"sc_state_lock\" of the struct\nnilfs_sc_info.  Since nilfs_segctor_kill_thread() does a final check to\nsee if \"sc_task\" is NULL with \"sc_state_lock\" locked, this can eliminate\nthe race."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-04T15:44:17.302Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/034cce77d52ba013ce62b4f5258c29907eb1ada5"
        },
        {
          "url": "https://git.kernel.org/stable/c/0dbf0e64b91ee8fcb278aea93eb06fc7d56ecbcc"
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        {
          "url": "https://git.kernel.org/stable/c/613bf23c070d11c525268f2945aa594704a9b764"
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          "url": "https://git.kernel.org/stable/c/f32297dba338dc06d62286dedb3cdbd5175b1719"
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          "url": "https://git.kernel.org/stable/c/92684e02654c91a61a0b0561433b710bcece19fe"
        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/6be49d100c22ffea3287a4b19d7639d259888e33"
        }
      ],
      "title": "nilfs2: fix potential UAF of struct nilfs_sc_info in nilfs_segctor_thread()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53608",
    "datePublished": "2025-10-04T15:44:17.302Z",
    "dateReserved": "2025-10-04T15:40:38.480Z",
    "dateUpdated": "2025-10-04T15:44:17.302Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53608\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-04T16:15:57.527\",\"lastModified\":\"2025-10-06T14:56:21.733\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnilfs2: fix potential UAF of struct nilfs_sc_info in nilfs_segctor_thread()\\n\\nThe finalization of nilfs_segctor_thread() can race with\\nnilfs_segctor_kill_thread() which terminates that thread, potentially\\ncausing a use-after-free BUG as KASAN detected.\\n\\nAt the end of nilfs_segctor_thread(), it assigns NULL to \\\"sc_task\\\" member\\nof \\\"struct nilfs_sc_info\\\" to indicate the thread has finished, and then\\nnotifies nilfs_segctor_kill_thread() of this using waitqueue\\n\\\"sc_wait_task\\\" on the struct nilfs_sc_info.\\n\\nHowever, here, immediately after the NULL assignment to \\\"sc_task\\\", it is\\npossible that nilfs_segctor_kill_thread() will detect it and return to\\ncontinue the deallocation, freeing the nilfs_sc_info structure before the\\nthread does the notification.\\n\\nThis fixes the issue by protecting the NULL assignment to \\\"sc_task\\\" and\\nits notification, with spinlock \\\"sc_state_lock\\\" of the struct\\nnilfs_sc_info.  Since nilfs_segctor_kill_thread() does a final check to\\nsee if \\\"sc_task\\\" is NULL with \\\"sc_state_lock\\\" locked, this can eliminate\\nthe race.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/034cce77d52ba013ce62b4f5258c29907eb1ada5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0dbf0e64b91ee8fcb278aea93eb06fc7d56ecbcc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/613bf23c070d11c525268f2945aa594704a9b764\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6be49d100c22ffea3287a4b19d7639d259888e33\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/92684e02654c91a61a0b0561433b710bcece19fe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b4d80bd6370b81a1725b6b8f7894802c23a14e9f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bae009a2f1b7c2011d2e92d8c84868d315c0b97e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f32297dba338dc06d62286dedb3cdbd5175b1719\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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