CVE-2025-40211 (GCVE-0-2025-40211)

Vulnerability from cvelistv5 – Published: 2025-11-21 10:21 – Updated: 2025-12-03 12:05
VLAI?
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 ]
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7 , < 3f803ccf5a0c043e7c8b83f6665b082401fc8bee (git)
Affected: 8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7 , < 4e85246ec0d019dfba86ba54d841ef6694f97149 (git)
Affected: 8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7 , < de5fc93275a4a459fe2f7cb746984f2ab3e8292a (git)
Affected: 8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7 , < 293125536ef5521328815fa7c76d5f9eb1635659 (git)
Affected: 8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7 , < 8f067aa59430266386b83c18b983ca583faa6a11 (git)
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    Linux Linux Affected: 3.17
Unaffected: 0 , < 3.17 (semver)
Unaffected: 5.4.302 , ≤ 5.4.* (semver)
Unaffected: 6.6.117 , ≤ 6.6.* (semver)
Unaffected: 6.12.58 , ≤ 6.12.* (semver)
Unaffected: 6.17.8 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/acpi/acpi_video.c"
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          "vendor": "Linux",
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              "status": "unaffected",
              "version": "6.12.58",
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              "status": "unaffected",
              "version": "6.17.8",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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          "nodes": [
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              "operator": "OR"
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      "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 ]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-03T12:05:26.646Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/3f803ccf5a0c043e7c8b83f6665b082401fc8bee"
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        },
        {
          "url": "https://git.kernel.org/stable/c/293125536ef5521328815fa7c76d5f9eb1635659"
        },
        {
          "url": "https://git.kernel.org/stable/c/8f067aa59430266386b83c18b983ca583faa6a11"
        }
      ],
      "title": "ACPI: video: Fix use-after-free in acpi_video_switch_brightness()",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40211",
    "datePublished": "2025-11-21T10:21:36.438Z",
    "dateReserved": "2025-04-16T07:20:57.179Z",
    "dateUpdated": "2025-12-03T12:05:26.646Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40211\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-11-21T11:15:49.513\",\"lastModified\":\"2025-12-03T13:16:02.357\",\"vulnStatus\":\"Awaiting Analysis\",\"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 ]\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/293125536ef5521328815fa7c76d5f9eb1635659\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3f803ccf5a0c043e7c8b83f6665b082401fc8bee\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4e85246ec0d019dfba86ba54d841ef6694f97149\",\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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