CVE-2023-53511 (GCVE-0-2023-53511)
Vulnerability from cvelistv5
Published
2025-10-01 11:46
Modified
2025-10-01 11:46
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: io_uring: fix fget leak when fs don't support nowait buffered read Heming reported a BUG when using io_uring doing link-cp on ocfs2. [1] Do the following steps can reproduce this BUG: mount -t ocfs2 /dev/vdc /mnt/ocfs2 cp testfile /mnt/ocfs2/ ./link-cp /mnt/ocfs2/testfile /mnt/ocfs2/testfile.1 umount /mnt/ocfs2 Then umount will fail, and it outputs: umount: /mnt/ocfs2: target is busy. While tracing umount, it blames mnt_get_count() not return as expected. Do a deep investigation for fget()/fput() on related code flow, I've finally found that fget() leaks since ocfs2 doesn't support nowait buffered read. io_issue_sqe |-io_assign_file // do fget() first |-io_read |-io_iter_do_read |-ocfs2_file_read_iter // return -EOPNOTSUPP |-kiocb_done |-io_rw_done |-__io_complete_rw_common // set REQ_F_REISSUE |-io_resubmit_prep |-io_req_prep_async // override req->file, leak happens This was introduced by commit a196c78b5443 in v5.18. Fix it by don't re-assign req->file if it has already been assigned. [1] https://lore.kernel.org/ocfs2-devel/ab580a75-91c8-d68a-3455-40361be1bfa8@linux.alibaba.com/T/#t
References
Impacted products
Vendor Product Version
Linux Linux Version: a196c78b5443fc61af2c0490213b9d125482cbd1
Version: a196c78b5443fc61af2c0490213b9d125482cbd1
Version: a196c78b5443fc61af2c0490213b9d125482cbd1
Version: cef27a7d36026bd3c86f4fdfb4611ebbe2814af4
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "io_uring/io_uring.c"
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: fix fget leak when fs don\u0027t support nowait buffered read\n\nHeming reported a BUG when using io_uring doing link-cp on ocfs2. [1]\n\nDo the following steps can reproduce this BUG:\nmount -t ocfs2 /dev/vdc /mnt/ocfs2\ncp testfile /mnt/ocfs2/\n./link-cp /mnt/ocfs2/testfile /mnt/ocfs2/testfile.1\numount /mnt/ocfs2\n\nThen umount will fail, and it outputs:\numount: /mnt/ocfs2: target is busy.\n\nWhile tracing umount, it blames mnt_get_count() not return as expected.\nDo a deep investigation for fget()/fput() on related code flow, I\u0027ve\nfinally found that fget() leaks since ocfs2 doesn\u0027t support nowait\nbuffered read.\n\nio_issue_sqe\n|-io_assign_file  // do fget() first\n  |-io_read\n  |-io_iter_do_read\n    |-ocfs2_file_read_iter  // return -EOPNOTSUPP\n  |-kiocb_done\n    |-io_rw_done\n      |-__io_complete_rw_common  // set REQ_F_REISSUE\n    |-io_resubmit_prep\n      |-io_req_prep_async  // override req-\u003efile, leak happens\n\nThis was introduced by commit a196c78b5443 in v5.18. Fix it by don\u0027t\nre-assign req-\u003efile if it has already been assigned.\n\n[1] https://lore.kernel.org/ocfs2-devel/ab580a75-91c8-d68a-3455-40361be1bfa8@linux.alibaba.com/T/#t"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-01T11:46:00.185Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/75a499fc9d66a32271e2b3e4ca71156e8ad3b484"
        },
        {
          "url": "https://git.kernel.org/stable/c/10fb2e16ee6ffaf1716b9e90d007e6b300bfa457"
        },
        {
          "url": "https://git.kernel.org/stable/c/54aa7f2330b82884f4a1afce0220add6e8312f8b"
        }
      ],
      "title": "io_uring: fix fget leak when fs don\u0027t support nowait buffered read",
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      }
    }
  },
  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53511",
    "datePublished": "2025-10-01T11:46:00.185Z",
    "dateReserved": "2025-10-01T11:39:39.406Z",
    "dateUpdated": "2025-10-01T11:46:00.185Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53511\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-01T12:15:55.030\",\"lastModified\":\"2025-10-02T19:11:46.753\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nio_uring: fix fget leak when fs don\u0027t support nowait buffered read\\n\\nHeming reported a BUG when using io_uring doing link-cp on ocfs2. [1]\\n\\nDo the following steps can reproduce this BUG:\\nmount -t ocfs2 /dev/vdc /mnt/ocfs2\\ncp testfile /mnt/ocfs2/\\n./link-cp /mnt/ocfs2/testfile /mnt/ocfs2/testfile.1\\numount /mnt/ocfs2\\n\\nThen umount will fail, and it outputs:\\numount: /mnt/ocfs2: target is busy.\\n\\nWhile tracing umount, it blames mnt_get_count() not return as expected.\\nDo a deep investigation for fget()/fput() on related code flow, I\u0027ve\\nfinally found that fget() leaks since ocfs2 doesn\u0027t support nowait\\nbuffered read.\\n\\nio_issue_sqe\\n|-io_assign_file  // do fget() first\\n  |-io_read\\n  |-io_iter_do_read\\n    |-ocfs2_file_read_iter  // return -EOPNOTSUPP\\n  |-kiocb_done\\n    |-io_rw_done\\n      |-__io_complete_rw_common  // set REQ_F_REISSUE\\n    |-io_resubmit_prep\\n      |-io_req_prep_async  // override req-\u003efile, leak happens\\n\\nThis was introduced by commit a196c78b5443 in v5.18. Fix it by don\u0027t\\nre-assign req-\u003efile if it has already been assigned.\\n\\n[1] https://lore.kernel.org/ocfs2-devel/ab580a75-91c8-d68a-3455-40361be1bfa8@linux.alibaba.com/T/#t\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/10fb2e16ee6ffaf1716b9e90d007e6b300bfa457\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/54aa7f2330b82884f4a1afce0220add6e8312f8b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/75a499fc9d66a32271e2b3e4ca71156e8ad3b484\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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