FKIE_CVE-2025-71073

Vulnerability from fkie_nvd - Published: 2026-01-13 16:16 - Updated: 2026-01-14 16:26
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: Input: lkkbd - disable pending work before freeing device lkkbd_interrupt() schedules lk->tq via schedule_work(), and the work handler lkkbd_reinit() dereferences the lkkbd structure and its serio/input_dev fields. lkkbd_disconnect() and error paths in lkkbd_connect() free the lkkbd structure without preventing the reinit work from being queued again until serio_close() returns. This can allow the work handler to run after the structure has been freed, leading to a potential use-after-free. Use disable_work_sync() instead of cancel_work_sync() to ensure the reinit work cannot be re-queued, and call it both in lkkbd_disconnect() and in lkkbd_connect() error paths after serio_open().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3a7cd1397c209076c371d53bf39a55c138f62342
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cffc4e29b1e2d44ab094cf142d7c461ff09b9104
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e58c88f0cb2d8ed89de78f6f17409d29cfab6c5c
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nInput: lkkbd - disable pending work before freeing device\n\nlkkbd_interrupt() schedules lk-\u003etq via schedule_work(), and the work\nhandler lkkbd_reinit() dereferences the lkkbd structure and its\nserio/input_dev fields.\n\nlkkbd_disconnect() and error paths in lkkbd_connect() free the lkkbd\nstructure without preventing the reinit work from being queued again\nuntil serio_close() returns. This can allow the work handler to run\nafter the structure has been freed, leading to a potential use-after-free.\n\nUse disable_work_sync() instead of cancel_work_sync() to ensure the\nreinit work cannot be re-queued, and call it both in lkkbd_disconnect()\nand in lkkbd_connect() error paths after serio_open()."
    }
  ],
  "id": "CVE-2025-71073",
  "lastModified": "2026-01-14T16:26:00.933",
  "metrics": {},
  "published": "2026-01-13T16:16:06.743",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3a7cd1397c209076c371d53bf39a55c138f62342"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cffc4e29b1e2d44ab094cf142d7c461ff09b9104"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e58c88f0cb2d8ed89de78f6f17409d29cfab6c5c"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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