CVE-2025-40211 (GCVE-0-2025-40211)
Vulnerability from cvelistv5
Published
2025-11-21 10:21
Modified
2025-11-21 10:21
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
Impacted products
Vendor Product Version
Linux Linux Version: 8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7
Version: 8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7
Version: 8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7
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{
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/acpi/acpi_video.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "3.17"
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            {
              "lessThan": "3.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "lessThanOrEqual": "6.12.*",
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              "versionType": "semver"
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              "lessThanOrEqual": "6.17.*",
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              "version": "6.17.8",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.18-rc4",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": "2025-11-21T10:21:36.438Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/de5fc93275a4a459fe2f7cb746984f2ab3e8292a"
        },
        {
          "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()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "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": "2025-11-21T10:21:36.438Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40211\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-11-21T11:15:49.513\",\"lastModified\":\"2025-11-21T15:13:13.800\",\"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/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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