CVE-2023-54117 (GCVE-0-2023-54117)

Vulnerability from cvelistv5 – Published: 2025-12-24 13:06 – Updated: 2025-12-24 13:06
VLAI?
Title
s390/dcssblk: fix kernel crash with list_add corruption
Summary
In the Linux kernel, the following vulnerability has been resolved: s390/dcssblk: fix kernel crash with list_add corruption Commit fb08a1908cb1 ("dax: simplify the dax_device <-> gendisk association") introduced new logic for gendisk association, requiring drivers to explicitly call dax_add_host() and dax_remove_host(). For dcssblk driver, some dax_remove_host() calls were missing, e.g. in device remove path. The commit also broke error handling for out_dax case in device add path, resulting in an extra put_device() w/o the previous get_device() in that case. This lead to stale xarray entries after device add / remove cycles. In the case when a previously used struct gendisk pointer (xarray index) would be used again, because blk_alloc_disk() happened to return such a pointer, the xa_insert() in dax_add_host() would fail and go to out_dax, doing the extra put_device() in the error path. In combination with an already flawed error handling in dcssblk (device_register() cleanup), which needs to be addressed in a separate patch, this resulted in a missing device_del() / klist_del(), and eventually in the kernel crash with list_add corruption on a subsequent device_add() / klist_add(). Fix this by adding the missing dax_remove_host() calls, and also move the put_device() in the error path to restore the previous logic.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: fb08a1908cb119a4585611d91461ab6d27756b14 , < 6489ec0107860345bc57dcde39e63dfb05ac5c11 (git)
Affected: fb08a1908cb119a4585611d91461ab6d27756b14 , < b7ad75c77349beb4983b9f27108d9b3f33ae1413 (git)
Affected: fb08a1908cb119a4585611d91461ab6d27756b14 , < b5c531a9a7d8e047c90c909f09cef06a9f8e62f4 (git)
Affected: fb08a1908cb119a4585611d91461ab6d27756b14 , < c8f40a0bccefd613748d080147469a4652d6e74c (git)
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    Linux Linux Affected: 5.17
Unaffected: 0 , < 5.17 (semver)
Unaffected: 6.1.53 , ≤ 6.1.* (semver)
Unaffected: 6.4.16 , ≤ 6.4.* (semver)
Unaffected: 6.5.3 , ≤ 6.5.* (semver)
Unaffected: 6.6 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/s390/block/dcssblk.c"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/dcssblk: fix kernel crash with list_add corruption\n\nCommit fb08a1908cb1 (\"dax: simplify the dax_device \u003c-\u003e gendisk\nassociation\") introduced new logic for gendisk association, requiring\ndrivers to explicitly call dax_add_host() and dax_remove_host().\n\nFor dcssblk driver, some dax_remove_host() calls were missing, e.g. in\ndevice remove path. The commit also broke error handling for out_dax case\nin device add path, resulting in an extra put_device() w/o the previous\nget_device() in that case.\n\nThis lead to stale xarray entries after device add / remove cycles. In the\ncase when a previously used struct gendisk pointer (xarray index) would be\nused again, because blk_alloc_disk() happened to return such a pointer, the\nxa_insert() in dax_add_host() would fail and go to out_dax, doing the extra\nput_device() in the error path. In combination with an already flawed error\nhandling in dcssblk (device_register() cleanup), which needs to be\naddressed in a separate patch, this resulted in a missing device_del() /\nklist_del(), and eventually in the kernel crash with list_add corruption on\na subsequent device_add() / klist_add().\n\nFix this by adding the missing dax_remove_host() calls, and also move the\nput_device() in the error path to restore the previous logic."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-24T13:06:38.311Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/6489ec0107860345bc57dcde39e63dfb05ac5c11"
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        },
        {
          "url": "https://git.kernel.org/stable/c/c8f40a0bccefd613748d080147469a4652d6e74c"
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      ],
      "title": "s390/dcssblk: fix kernel crash with list_add corruption",
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    "cveId": "CVE-2023-54117",
    "datePublished": "2025-12-24T13:06:38.311Z",
    "dateReserved": "2025-12-24T13:02:52.520Z",
    "dateUpdated": "2025-12-24T13:06:38.311Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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