CVE-2025-38584 (GCVE-0-2025-38584)
Vulnerability from cvelistv5
Published
2025-08-19 17:03
Modified
2025-09-29 05:54
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: padata: Fix pd UAF once and for all There is a race condition/UAF in padata_reorder that goes back to the initial commit. A reference count is taken at the start of the process in padata_do_parallel, and released at the end in padata_serial_worker. This reference count is (and only is) required for padata_replace to function correctly. If padata_replace is never called then there is no issue. In the function padata_reorder which serves as the core of padata, as soon as padata is added to queue->serial.list, and the associated spin lock released, that padata may be processed and the reference count on pd would go away. Fix this by getting the next padata before the squeue->serial lock is released. In order to make this possible, simplify padata_reorder by only calling it once the next padata arrives.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/71203f68c7749609d7fc8ae6ad054bdedeb24f91
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cdf79bd2e1ecb3cc75631c73d8f4149be6019a52
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dbe3e911a59bda6de96e7cae387ff882c2c177fa
Impacted products
Vendor Product Version
Linux Linux Version: 16295bec6398a3eedc9377e1af6ff4c71b98c300
Version: 16295bec6398a3eedc9377e1af6ff4c71b98c300
Version: 16295bec6398a3eedc9377e1af6ff4c71b98c300
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   Linux Linux Version: 2.6.34
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        {
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          "product": "Linux",
          "programFiles": [
            "include/linux/padata.h",
            "kernel/padata.c"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npadata: Fix pd UAF once and for all\n\nThere is a race condition/UAF in padata_reorder that goes back\nto the initial commit.  A reference count is taken at the start\nof the process in padata_do_parallel, and released at the end in\npadata_serial_worker.\n\nThis reference count is (and only is) required for padata_replace\nto function correctly.  If padata_replace is never called then\nthere is no issue.\n\nIn the function padata_reorder which serves as the core of padata,\nas soon as padata is added to queue-\u003eserial.list, and the associated\nspin lock released, that padata may be processed and the reference\ncount on pd would go away.\n\nFix this by getting the next padata before the squeue-\u003eserial lock\nis released.\n\nIn order to make this possible, simplify padata_reorder by only\ncalling it once the next padata arrives."
        }
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      "providerMetadata": {
        "dateUpdated": "2025-09-29T05:54:15.987Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/71203f68c7749609d7fc8ae6ad054bdedeb24f91"
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      ],
      "title": "padata: Fix pd UAF once and for all",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38584",
    "datePublished": "2025-08-19T17:03:06.172Z",
    "dateReserved": "2025-04-16T04:51:24.026Z",
    "dateUpdated": "2025-09-29T05:54:15.987Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38584\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-08-19T17:15:35.723\",\"lastModified\":\"2025-08-20T14:40:17.713\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\npadata: Fix pd UAF once and for all\\n\\nThere is a race condition/UAF in padata_reorder that goes back\\nto the initial commit.  A reference count is taken at the start\\nof the process in padata_do_parallel, and released at the end in\\npadata_serial_worker.\\n\\nThis reference count is (and only is) required for padata_replace\\nto function correctly.  If padata_replace is never called then\\nthere is no issue.\\n\\nIn the function padata_reorder which serves as the core of padata,\\nas soon as padata is added to queue-\u003eserial.list, and the associated\\nspin lock released, that padata may be processed and the reference\\ncount on pd would go away.\\n\\nFix this by getting the next padata before the squeue-\u003eserial lock\\nis released.\\n\\nIn order to make this possible, simplify padata_reorder by only\\ncalling it once the next padata arrives.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: padata: Arregla pd UAF de una vez por todas Hay una condici\u00f3n de ejecuci\u00f3n/UAF en padata_reorder que se remonta a la confirmaci\u00f3n inicial. Se toma un recuento de referencias al inicio del proceso en padata_do_parallel y se libera al final en padata_serial_worker. Este recuento de referencias es (y solo es) necesario para que padata_replace funcione correctamente. Si nunca se llama a padata_replace, no hay problema. En la funci\u00f3n padata_reorder que sirve como n\u00facleo de padata, tan pronto como padata se agrega a queue-\u0026gt;serial.list y se libera el bloqueo de giro asociado, ese padata puede procesarse y el recuento de referencias en pd desaparecer\u00eda. Arregla esto obteniendo el siguiente padata antes de que se libere el bloqueo squeue-\u0026gt;serial. Para que esto sea posible, simplifica padata_reorder llam\u00e1ndolo solo una vez que llega el siguiente padata.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/71203f68c7749609d7fc8ae6ad054bdedeb24f91\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cdf79bd2e1ecb3cc75631c73d8f4149be6019a52\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dbe3e911a59bda6de96e7cae387ff882c2c177fa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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