FKIE_CVE-2025-39870

Vulnerability from fkie_nvd - Published: 2025-09-23 06:15 - Updated: 2025-11-03 18:16
Severity ?
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/25e6146c2812487a88f619d5ff6efbdcd5b2bc31
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/39aaa337449e71a41d4813be0226a722827ba606
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9f0e225635475b2285b966271d5e82cba74295b1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/df82c7901513fd0fc738052a8e6a330d92cc8ec9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ec5430d090d0b6ace8fefa290fc37e88930017d2
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
Impacted products
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{
  "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\u0027s simpler to just re-write it in a cleaner\nway.  The issues here are:\n\n1) If \"idxd-\u003emax_wqs\" is \u003c= 0 then we call put_device(conf_dev) when\n   \"conf_dev\" hasn\u0027t been initialized.\n2) If kzalloc_node() fails then again \"conf_dev\" is invalid.  It\u0027s\n   either uninitialized or it points to the \"conf_dev\" from the\n   previous iteration so it leads to a double free.\n\nIt\u0027s 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."
    }
  ],
  "id": "CVE-2025-39870",
  "lastModified": "2025-11-03T18:16:51.273",
  "metrics": {},
  "published": "2025-09-23T06:15:46.240",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/25e6146c2812487a88f619d5ff6efbdcd5b2bc31"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/39aaa337449e71a41d4813be0226a722827ba606"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9f0e225635475b2285b966271d5e82cba74295b1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/df82c7901513fd0fc738052a8e6a330d92cc8ec9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ec5430d090d0b6ace8fefa290fc37e88930017d2"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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