CVE-2025-22126 (GCVE-0-2025-22126)
Vulnerability from cvelistv5
Published
2025-04-16 14:13
Modified
2025-05-26 05:19
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: md: fix mddev uaf while iterating all_mddevs list While iterating all_mddevs list from md_notify_reboot() and md_exit(), list_for_each_entry_safe is used, and this can race with deletint the next mddev, causing UAF: t1: spin_lock //list_for_each_entry_safe(mddev, n, ...) mddev_get(mddev1) // assume mddev2 is the next entry spin_unlock t2: //remove mddev2 ... mddev_free spin_lock list_del spin_unlock kfree(mddev2) mddev_put(mddev1) spin_lock //continue dereference mddev2->all_mddevs The old helper for_each_mddev() actually grab the reference of mddev2 while holding the lock, to prevent from being freed. This problem can be fixed the same way, however, the code will be complex. Hence switch to use list_for_each_entry, in this case mddev_put() can free the mddev1 and it's not safe as well. Refer to md_seq_show(), also factor out a helper mddev_put_locked() to fix this problem.
References
Impacted products
Vendor Product Version
Linux Linux Version: f26514342255855f4ca3c0a92cb1cdea01c33004
Version: f26514342255855f4ca3c0a92cb1cdea01c33004
Version: f26514342255855f4ca3c0a92cb1cdea01c33004
Version: f26514342255855f4ca3c0a92cb1cdea01c33004
Version: f26514342255855f4ca3c0a92cb1cdea01c33004
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/md/md.c"
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          ],
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          "vendor": "Linux",
          "versions": [
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              "version": "6.0"
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              "version": "0",
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              "status": "unaffected",
              "version": "6.14.2",
              "versionType": "semver"
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd: fix mddev uaf while iterating all_mddevs list\n\nWhile iterating all_mddevs list from md_notify_reboot() and md_exit(),\nlist_for_each_entry_safe is used, and this can race with deletint the\nnext mddev, causing UAF:\n\nt1:\nspin_lock\n//list_for_each_entry_safe(mddev, n, ...)\n mddev_get(mddev1)\n // assume mddev2 is the next entry\n spin_unlock\n            t2:\n            //remove mddev2\n            ...\n            mddev_free\n            spin_lock\n            list_del\n            spin_unlock\n            kfree(mddev2)\n mddev_put(mddev1)\n spin_lock\n //continue dereference mddev2-\u003eall_mddevs\n\nThe old helper for_each_mddev() actually grab the reference of mddev2\nwhile holding the lock, to prevent from being freed. This problem can be\nfixed the same way, however, the code will be complex.\n\nHence switch to use list_for_each_entry, in this case mddev_put() can free\nthe mddev1 and it\u0027s not safe as well. Refer to md_seq_show(), also factor\nout a helper mddev_put_locked() to fix this problem."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-26T05:19:02.408Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ca9f84de76723b358dfc0606668efdca54afc2e5"
        },
        {
          "url": "https://git.kernel.org/stable/c/d69a23d8e925f8052d657652a6875ec2712c7e33"
        },
        {
          "url": "https://git.kernel.org/stable/c/e2a9f73ee408a460f4c9dfe03b4741d6b11652b8"
        },
        {
          "url": "https://git.kernel.org/stable/c/5462544ccbad3fc938a71b01fa5bd3a0dc2b750a"
        },
        {
          "url": "https://git.kernel.org/stable/c/8542870237c3a48ff049b6c5df5f50c8728284fa"
        }
      ],
      "title": "md: fix mddev uaf while iterating all_mddevs list",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-22126",
    "datePublished": "2025-04-16T14:13:09.399Z",
    "dateReserved": "2024-12-29T08:45:45.823Z",
    "dateUpdated": "2025-05-26T05:19:02.408Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-22126\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-04-16T15:16:06.727\",\"lastModified\":\"2025-04-25T11:15:45.880\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmd: fix mddev uaf while iterating all_mddevs list\\n\\nWhile iterating all_mddevs list from md_notify_reboot() and md_exit(),\\nlist_for_each_entry_safe is used, and this can race with deletint the\\nnext mddev, causing UAF:\\n\\nt1:\\nspin_lock\\n//list_for_each_entry_safe(mddev, n, ...)\\n mddev_get(mddev1)\\n // assume mddev2 is the next entry\\n spin_unlock\\n            t2:\\n            //remove mddev2\\n            ...\\n            mddev_free\\n            spin_lock\\n            list_del\\n            spin_unlock\\n            kfree(mddev2)\\n mddev_put(mddev1)\\n spin_lock\\n //continue dereference mddev2-\u003eall_mddevs\\n\\nThe old helper for_each_mddev() actually grab the reference of mddev2\\nwhile holding the lock, to prevent from being freed. This problem can be\\nfixed the same way, however, the code will be complex.\\n\\nHence switch to use list_for_each_entry, in this case mddev_put() can free\\nthe mddev1 and it\u0027s not safe as well. Refer to md_seq_show(), also factor\\nout a helper mddev_put_locked() to fix this problem.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: md: corregir mddev uaf mientras se itera la lista all_mddevs Mientras se itera la lista all_mddevs desde md_notify_reboot() y md_exit(), se usa list_for_each_entry_safe, y esto puede competir con deletint en el siguiente mddev, lo que causa UAF: t1: spin_lock //list_for_each_entry_safe(mddev, n, ...) mddev_get(mddev1) // asumir que mddev2 es la siguiente entrada spin_unlock t2: //eliminar mddev2 ... mddev_free spin_lock list_del spin_unlock kfree(mddev2) mddev_put(mddev1) spin_lock //continuar la desreferencia de mddev2-\u0026gt;all_mddevs El antiguo ayudante for_each_mddev() en realidad toma la referencia de mddev2 mientras mantiene el bloqueo, para evitar ser Liberado. Este problema se puede solucionar de la misma manera; sin embargo, el c\u00f3digo ser\u00e1 complejo. Por lo tanto, cambie a list_for_each_entry; en este caso, mddev_put() puede liberar el mddev1, lo cual tampoco es seguro. Consulte md_seq_show() y tambi\u00e9n descarte la funci\u00f3n auxiliar mddev_put_locked() para solucionar este problema.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5462544ccbad3fc938a71b01fa5bd3a0dc2b750a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8542870237c3a48ff049b6c5df5f50c8728284fa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ca9f84de76723b358dfc0606668efdca54afc2e5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d69a23d8e925f8052d657652a6875ec2712c7e33\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e2a9f73ee408a460f4c9dfe03b4741d6b11652b8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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