fkie_cve-2025-39997
Vulnerability from fkie_nvd
Published
2025-10-15 08:15
Modified
2025-10-16 15:28
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free The previous commit 0718a78f6a9f ("ALSA: usb-audio: Kill timer properly at removal") patched a UAF issue caused by the error timer. However, because the error timer kill added in this patch occurs after the endpoint delete, a race condition to UAF still occurs, albeit rarely. Additionally, since kill-cleanup for urb is also missing, freed memory can be accessed in interrupt context related to urb, which can cause UAF. Therefore, to prevent this, error timer and urb must be killed before freeing the heap memory.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/353d8c715cc951a980728133c9dd64ca5a0a186c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/647d6b8d22be12842fde6ed0c56859ebc615f21e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9f2c0ac1423d5f267e7f1d1940780fc764b0fee3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/af600e7f5526d16146b3ae99f6ad57bfea79ca33
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dc4874366cf6cf4a31d8fa4b7f0e2a5b2d7647ba
Impacted products
Vendor Product Version


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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free\n\nThe previous commit 0718a78f6a9f (\"ALSA: usb-audio: Kill timer properly at\nremoval\") patched a UAF issue caused by the error timer.\n\nHowever, because the error timer kill added in this patch occurs after the\nendpoint delete, a race condition to UAF still occurs, albeit rarely.\n\nAdditionally, since kill-cleanup for urb is also missing, freed memory can\nbe accessed in interrupt context related to urb, which can cause UAF.\n\nTherefore, to prevent this, error timer and urb must be killed before\nfreeing the heap memory."
    }
  ],
  "id": "CVE-2025-39997",
  "lastModified": "2025-10-16T15:28:59.610",
  "metrics": {},
  "published": "2025-10-15T08:15:37.947",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/353d8c715cc951a980728133c9dd64ca5a0a186c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/647d6b8d22be12842fde6ed0c56859ebc615f21e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9f2c0ac1423d5f267e7f1d1940780fc764b0fee3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/af600e7f5526d16146b3ae99f6ad57bfea79ca33"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dc4874366cf6cf4a31d8fa4b7f0e2a5b2d7647ba"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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