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CVE-2025-40211
ACPI: video: Fix use-after-free in acpi_video_switch_brightness()
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 ]

INFO

Published Date :

Nov. 21, 2025, 11:15 a.m.

Last Modified :

Dec. 6, 2025, 10:15 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products

The following products are affected by CVE-2025-40211 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Solution
Resolve use-after-free by synchronizing delayed work before memory deallocation.
  • Cancel delayed work synchronously before freeing memory.
  • Ensure work completes before resources are freed.
  • Update the Linux kernel to the latest version.
  • Apply relevant security patches.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-40211.

URL Resource
https://git.kernel.org/stable/c/293125536ef5521328815fa7c76d5f9eb1635659
https://git.kernel.org/stable/c/3f803ccf5a0c043e7c8b83f6665b082401fc8bee
https://git.kernel.org/stable/c/4e85246ec0d019dfba86ba54d841ef6694f97149
https://git.kernel.org/stable/c/8f067aa59430266386b83c18b983ca583faa6a11
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
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-40211 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-40211 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-40211 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2025-40211 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Dec. 06, 2025

    Action Type Old Value New Value
    Added Reference https://git.kernel.org/stable/c/a63a5b6fb508d78fe57ae3b159d9ef3af7ba80e9
    Added Reference https://git.kernel.org/stable/c/ba1704316492a0496c69334338ea1fdbf4c2fd34
    Added Reference https://git.kernel.org/stable/c/bc78a4f51d548c1ccc3d1967c2b394bf687c86e9
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Dec. 03, 2025

    Action Type Old Value New Value
    Added Reference https://git.kernel.org/stable/c/3f803ccf5a0c043e7c8b83f6665b082401fc8bee
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Nov. 24, 2025

    Action Type Old Value New Value
    Added Reference https://git.kernel.org/stable/c/4e85246ec0d019dfba86ba54d841ef6694f97149
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Nov. 21, 2025

    Action Type Old Value New Value
    Added 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 ]
    Added Reference https://git.kernel.org/stable/c/293125536ef5521328815fa7c76d5f9eb1635659
    Added Reference https://git.kernel.org/stable/c/8f067aa59430266386b83c18b983ca583faa6a11
    Added Reference https://git.kernel.org/stable/c/de5fc93275a4a459fe2f7cb746984f2ab3e8292a
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
No CVSS metrics available for this vulnerability.