fkie_cve-2025-40211
Vulnerability from fkie_nvd
Published
2025-11-21 11:15
Modified
2025-11-21 11:15
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ACPI: video: Fix use-after-free in acpi_video_switch_brightness() The switch_brightness_work delayed work accesses device->brightness and device->backlight, freed by acpi_video_dev_unregister_backlight() during device removal. If the work executes after acpi_video_bus_unregister_backlight() frees these resources, it causes a use-after-free when acpi_video_switch_brightness() dereferences device->brightness or device->backlight. Fix this by calling cancel_delayed_work_sync() for each device's switch_brightness_work in acpi_video_bus_remove_notify_handler() after removing the notify handler that queues the work. This ensures the work completes before the memory is freed. [ rjw: Changelog edit ]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/293125536ef5521328815fa7c76d5f9eb1635659
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8f067aa59430266386b83c18b983ca583faa6a11
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/de5fc93275a4a459fe2f7cb746984f2ab3e8292a
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\nACPI: video: Fix use-after-free in acpi_video_switch_brightness()\n\nThe switch_brightness_work delayed work accesses device-\u003ebrightness\nand device-\u003ebacklight, freed by acpi_video_dev_unregister_backlight()\nduring device removal.\n\nIf the work executes after acpi_video_bus_unregister_backlight()\nfrees these resources, it causes a use-after-free when\nacpi_video_switch_brightness() dereferences device-\u003ebrightness or\ndevice-\u003ebacklight.\n\nFix this by calling cancel_delayed_work_sync() for each device\u0027s\nswitch_brightness_work in acpi_video_bus_remove_notify_handler()\nafter removing the notify handler that queues the work. This ensures\nthe work completes before the memory is freed.\n\n[ rjw: Changelog edit ]"
    }
  ],
  "id": "CVE-2025-40211",
  "lastModified": "2025-11-21T11:15:49.513",
  "metrics": {},
  "published": "2025-11-21T11:15:49.513",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/293125536ef5521328815fa7c76d5f9eb1635659"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8f067aa59430266386b83c18b983ca583faa6a11"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/de5fc93275a4a459fe2f7cb746984f2ab3e8292a"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}


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