CVE-2025-40211
Full vulnerability record from the local CVENow database.
Description
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
Not scored
CVSS score
Not available
Vulnerability status
Deferred
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-11-21 11:15:49.513000
Last modified
2026-10-19 19:10:00.130000
View original CVE JSON
{
"id": "CVE-2025-40211",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-11-21T11:15:49.513",
"lastModified": "2026-10-19T19:10:00.130",
"vulnStatus": "Deferred",
"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->brightness\nand device->backlight, 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->brightness or\ndevice->backlight.\n\nFix this by calling cancel_delayed_work_sync() for each device's\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 ]"
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nACPI: video: Corrección de uso después de liberación en acpi_video_switch_brightness()\n\nEl trabajo retrasado switch_brightness_work accede a device -> brightness y device -> backlight, liberados por acpi_video_dev_unregister_backlight() durante la eliminación del dispositivo.\n\nSi el trabajo se ejecuta después de que acpi_video_bus_unregister_backlight() libera estos recursos, causa un uso después de liberación cuando acpi_video_switch_brightness() desreferencia device -> brightness o device -> backlight.\n\nEsto se soluciona llamando a cancel_delayed_work_sync() para el switch_brightness_work de cada dispositivo en acpi_video_bus_remove_notify_handler() después de eliminar el gestor de notificación que encola el trabajo. Esto asegura que el trabajo se complete antes de que se libere la memoria.\n\n[ rjw: Edición del registro de cambios ]"
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"drivers/acpi/acpi_video.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7",
"lessThan": "3f803ccf5a0c043e7c8b83f6665b082401fc8bee",
"versionType": "git",
"status": "affected"
},
{
"version": "8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7",
"lessThan": "ba1704316492a0496c69334338ea1fdbf4c2fd34",
"versionType": "git",
"status": "affected"
},
{
"version": "8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7",
"lessThan": "bc78a4f51d548c1ccc3d1967c2b394bf687c86e9",
"versionType": "git",
"status": "affected"
},
{
"version": "8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7",
"lessThan": "a63a5b6fb508d78fe57ae3b159d9ef3af7ba80e9",
"versionType": "git",
"status": "affected"
},
{
"version": "8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7",
"lessThan": "4e85246ec0d019dfba86ba54d841ef6694f97149",
"versionType": "git",
"status": "affected"
},
{
"version": "8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7",
"lessThan": "de5fc93275a4a459fe2f7cb746984f2ab3e8292a",
"versionType": "git",
"status": "affected"
},
{
"version": "8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7",
"lessThan": "293125536ef5521328815fa7c76d5f9eb1635659",
"versionType": "git",
"status": "affected"
},
{
"version": "8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7",
"lessThan": "8f067aa59430266386b83c18b983ca583faa6a11",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"drivers/acpi/acpi_video.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "3.17",
"status": "affected"
},
{
"version": "0",
"lessThan": "3.17",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.4.302",
"lessThanOrEqual": "5.4.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.10.247",
"lessThanOrEqual": "5.10.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.15.197",
"lessThanOrEqual": "5.15.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.159",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.117",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.58",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.17.8",
"lessThanOrEqual": "6.17.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-06-16T19:58:30.759747Z",
"id": "CVE-2025-40211",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"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/a63a5b6fb508d78fe57ae3b159d9ef3af7ba80e9",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/ba1704316492a0496c69334338ea1fdbf4c2fd34",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/bc78a4f51d548c1ccc3d1967c2b394bf687c86e9",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/de5fc93275a4a459fe2f7cb746984f2ab3e8292a",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}