ACPI: video: Fix use-after-free in acpi_video_switch_brightness()

{
  "id": "5e17dc2efcecb1b7fc7bfcc34ac9545cf07429661efa830e7928c41dfab827d4",
  "url": "https://osv.dev/vulnerability/CVE-2025-40211",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ACPI: video: Fix use-after-free in acpi_video_switch_brightness()",
    "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 ]",
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      "modified": "2026-10-28T02:30:51.061825275Z",
      "provider": "osv",
      "references": [
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        "https://git.kernel.org/stable/c/3f803ccf5a0c043e7c8b83f6665b082401fc8bee",
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        "https://git.kernel.org/stable/c/a63a5b6fb508d78fe57ae3b159d9ef3af7ba80e9",
        "https://git.kernel.org/stable/c/ba1704316492a0496c69334338ea1fdbf4c2fd34",
        "https://git.kernel.org/stable/c/bc78a4f51d548c1ccc3d1967c2b394bf687c86e9",
        "https://git.kernel.org/stable/c/de5fc93275a4a459fe2f7cb746984f2ab3e8292a",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40211.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-40211",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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    "severity_evidence": null
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  "source_id": "core-osv",
  "document_id": 519904,
  "published_at": "2025-11-21T10:21:36.438+00:00"
}