github - ghsa-3xv8-84fj-hhg4

GHSA-3XV8-84FJ-HHG4

Vulnerability from github – Published: 2025-11-21 12:32 – Updated: 2025-12-03 15:30

Details

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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{
  "affected": [],
  "aliases": [
    "CVE-2025-40211"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-11-21T11:15:49Z",
    "severity": null
  },
  "details": "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": "GHSA-3xv8-84fj-hhg4",
  "modified": "2025-12-03T15:30:28Z",
  "published": "2025-11-21T12:32:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40211"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/293125536ef5521328815fa7c76d5f9eb1635659"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3f803ccf5a0c043e7c8b83f6665b082401fc8bee"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4e85246ec0d019dfba86ba54d841ef6694f97149"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8f067aa59430266386b83c18b983ca583faa6a11"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/de5fc93275a4a459fe2f7cb746984f2ab3e8292a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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

Vulnerability from cvelistv5 – Published: 2025-11-21 10:21 – Updated: 2025-12-03 12:05

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

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/3f803ccf5a0c043e7…
	https://git.kernel.org/stable/c/4e85246ec0d019dfb…
	https://git.kernel.org/stable/c/de5fc93275a4a459f…
	https://git.kernel.org/stable/c/293125536ef552132…
	https://git.kernel.org/stable/c/8f067aa5943026638…

Impacted products

Vendor

Product

Version

Linux

Affected: 8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7 , < 3f803ccf5a0c043e7c8b83f6665b082401fc8bee (git)
Affected: 8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7 , < 4e85246ec0d019dfba86ba54d841ef6694f97149 (git)
Affected: 8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7 , < de5fc93275a4a459fe2f7cb746984f2ab3e8292a (git)
Affected: 8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7 , < 293125536ef5521328815fa7c76d5f9eb1635659 (git)
Affected: 8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7 , < 8f067aa59430266386b83c18b983ca583faa6a11 (git)

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": {
    "cna": {
      "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",
          "versions": [
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              "versionType": "git"
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              "versionType": "git"
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              "versionType": "git"
            },
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              "status": "affected",
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              "versionType": "git"
            },
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
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            "drivers/acpi/acpi_video.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "3.17"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.4.302",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.117",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.58",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.302",
                  "versionStartIncluding": "3.17",
                  "vulnerable": true
                },
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                  "vulnerable": true
                },
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              ],
              "negate": false,
              "operator": "OR"
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          "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 ]"
        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "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()",
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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",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-3XV8-84FJ-HHG4

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

Tags

Sightings

Nomenclature