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CVE-2025-39870

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: Fix double free in idxd_setup_wqs() The clean up in idxd_setup_wqs() has had a couple bugs because the error handling is a bit subtle. It's simpler to just re-write it in a cleaner way. The issues here are: 1) If "idxd->max_wqs" is <= 0 then we call put_device(conf_dev) when "conf_dev" hasn't been initialized. 2) If kzalloc_node() fails then again "conf_dev" is invalid. It's either uninitialized or it points to the "conf_dev" from the previous iteration so it leads to a double free. It's better to free partial loop iterations within the loop and then the unwinding at the end can handle whole loop iterations. I also renamed the labels to describe what the goto does and not where the goto was located.

Severity
HIGH
CVSS score
7.8 (v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-09-23 06:15:46.240000
Last modified
2026-10-19 21:10:00.160000
View original CVE JSON 
{
  "id": "CVE-2025-39870",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-09-23T06:15:46.240",
  "lastModified": "2026-10-19T21:10:00.160",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: idxd: Fix double free in idxd_setup_wqs()\n\nThe clean up in idxd_setup_wqs() has had a couple bugs because the error\nhandling is a bit subtle.  It's simpler to just re-write it in a cleaner\nway.  The issues here are:\n\n1) If \"idxd->max_wqs\" is <= 0 then we call put_device(conf_dev) when\n   \"conf_dev\" hasn't been initialized.\n2) If kzalloc_node() fails then again \"conf_dev\" is invalid.  It's\n   either uninitialized or it points to the \"conf_dev\" from the\n   previous iteration so it leads to a double free.\n\nIt's better to free partial loop iterations within the loop and then\nthe unwinding at the end can handle whole loop iterations.  I also\nrenamed the labels to describe what the goto does and not where the goto\nwas located."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndmaengine: idxd: Corrección de doble liberación en idxd_setup_wqs()\n\nLa limpieza en idxd_setup_wqs() ha tenido un par de errores porque el manejo de errores es un poco sutil. Es más simple simplemente reescribirlo de una manera más limpia. Los problemas aquí son:\n\n1) Si 'idxd->max_wqs' es menor o igual que 0, entonces llamamos a put_device(conf_dev) cuando 'conf_dev' no ha sido inicializado.\n2) Si kzalloc_node() falla, entonces nuevamente 'conf_dev' es inválido. Está sin inicializar o apunta al 'conf_dev' de la iteración anterior, lo que lleva a una doble liberación.\n\nEs mejor liberar iteraciones parciales del bucle dentro del bucle y luego el desenrollado al final puede manejar iteraciones completas del bucle. También renombré las etiquetas para describir lo que hace el goto y no dónde estaba ubicado el goto."
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        "source": "[email protected]",
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          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
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          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
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      "source": "[email protected]",
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      "description": [
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