CVE-2023-53832 (GCVE-0-2023-53832)

Vulnerability from cvelistv5 – Published: 2025-12-09 01:29 – Updated: 2025-12-09 01:29
VLAI?
Title
md/raid10: fix null-ptr-deref in raid10_sync_request
Summary
In the Linux kernel, the following vulnerability has been resolved: md/raid10: fix null-ptr-deref in raid10_sync_request init_resync() inits mempool and sets conf->have_replacemnt at the beginning of sync, close_sync() frees the mempool when sync is completed. After [1] recovery might be skipped and init_resync() is called but close_sync() is not. null-ptr-deref occurs with r10bio->dev[i].repl_bio. The following is one way to reproduce the issue. 1) create a array, wait for resync to complete, mddev->recovery_cp is set to MaxSector. 2) recovery is woken and it is skipped. conf->have_replacement is set to 0 in init_resync(). close_sync() not called. 3) some io errors and rdev A is set to WantReplacement. 4) a new device is added and set to A's replacement. 5) recovery is woken, A have replacement, but conf->have_replacemnt is 0. r10bio->dev[i].repl_bio will not be alloced and null-ptr-deref occurs. Fix it by not calling init_resync() if recovery skipped. [1] commit 7e83ccbecd60 ("md/raid10: Allow skipping recovery when clean arrays are assembled")
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 7e83ccbecd608b971f340e951c9e84cd0343002f , < 38d33593260536840b49fd1dcac9aedfd14a9d42 (git)
Affected: 7e83ccbecd608b971f340e951c9e84cd0343002f , < 14964127be77884003976a392c9faa9ebaabbbe1 (git)
Affected: 7e83ccbecd608b971f340e951c9e84cd0343002f , < bdbf104b1c91fbf38f82c522ebf75429f094292a (git)
Affected: 7e83ccbecd608b971f340e951c9e84cd0343002f , < 68695084077e3de9d3e94e09238ace2b6f246446 (git)
Affected: 7e83ccbecd608b971f340e951c9e84cd0343002f , < b50fd1c3d9d0175aa29ff2706ef36cc178bc356a (git)
Affected: 7e83ccbecd608b971f340e951c9e84cd0343002f , < 99b503e4edc5938885d839cf0e7571963f75d800 (git)
Affected: 7e83ccbecd608b971f340e951c9e84cd0343002f , < 9e9efc77efd1956cc244af975240f2513d78a371 (git)
Affected: 7e83ccbecd608b971f340e951c9e84cd0343002f , < a405c6f0229526160aa3f177f65e20c86fce84c5 (git)
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    Linux Linux Affected: 3.10
Unaffected: 0 , < 3.10 (semver)
Unaffected: 4.19.283 , ≤ 4.19.* (semver)
Unaffected: 5.4.243 , ≤ 5.4.* (semver)
Unaffected: 5.10.180 , ≤ 5.10.* (semver)
Unaffected: 5.15.111 , ≤ 5.15.* (semver)
Unaffected: 6.1.28 , ≤ 6.1.* (semver)
Unaffected: 6.2.15 , ≤ 6.2.* (semver)
Unaffected: 6.3.2 , ≤ 6.3.* (semver)
Unaffected: 6.4 , ≤ * (original_commit_for_fix)
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/raid10: fix null-ptr-deref in raid10_sync_request\n\ninit_resync() inits mempool and sets conf-\u003ehave_replacemnt at the beginning\nof sync, close_sync() frees the mempool when sync is completed.\n\nAfter [1] recovery might be skipped and init_resync() is called but\nclose_sync() is not. null-ptr-deref occurs with r10bio-\u003edev[i].repl_bio.\n\nThe following is one way to reproduce the issue.\n\n  1) create a array, wait for resync to complete, mddev-\u003erecovery_cp is set\n     to MaxSector.\n  2) recovery is woken and it is skipped. conf-\u003ehave_replacement is set to\n     0 in init_resync(). close_sync() not called.\n  3) some io errors and rdev A is set to WantReplacement.\n  4) a new device is added and set to A\u0027s replacement.\n  5) recovery is woken, A have replacement, but conf-\u003ehave_replacemnt is\n     0. r10bio-\u003edev[i].repl_bio will not be alloced and null-ptr-deref\n     occurs.\n\nFix it by not calling init_resync() if recovery skipped.\n\n[1] commit 7e83ccbecd60 (\"md/raid10: Allow skipping recovery when clean arrays are assembled\")"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-09T01:29:47.513Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/38d33593260536840b49fd1dcac9aedfd14a9d42"
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          "url": "https://git.kernel.org/stable/c/14964127be77884003976a392c9faa9ebaabbbe1"
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        },
        {
          "url": "https://git.kernel.org/stable/c/a405c6f0229526160aa3f177f65e20c86fce84c5"
        }
      ],
      "title": "md/raid10: fix null-ptr-deref in raid10_sync_request",
      "x_generator": {
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      }
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53832",
    "datePublished": "2025-12-09T01:29:47.513Z",
    "dateReserved": "2025-12-09T01:27:17.825Z",
    "dateUpdated": "2025-12-09T01:29:47.513Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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