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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于acpi_video_switch_brightness函数存在释放后重用问题，可能导致内存损坏。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.19% · P9

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7< 3f803ccf5a0c043e7c8b83f6665b082401fc8bee affected
8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7< ba1704316492a0496c69334338ea1fdbf4c2fd34 affected
8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7< bc78a4f51d548c1ccc3d1967c2b394bf687c86e9 affected
8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7< a63a5b6fb508d78fe57ae3b159d9ef3af7ba80e9 affected
8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7< 4e85246ec0d019dfba86ba54d841ef6694f97149 affected
8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7< de5fc93275a4a459fe2f7cb746984f2ab3e8292a affected
8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7< 293125536ef5521328815fa7c76d5f9eb1635659 affected
8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7< 8f067aa59430266386b83c18b983ca583faa6a11 affected
… +10 more rows
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I. Basic Information for CVE-2025-40211

Vulnerability Information
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Vulnerability Title
ACPI: video: Fix use-after-free in acpi_video_switch_brightness()
Source: CVE Program / CVE List V5
Vulnerability 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 ]
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于acpi_video_switch_brightness函数存在释放后重用问题，可能导致内存损坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 8ab58e8e7e097bae5fe39cbc67eb93a91f7134b7 ~ 3f803ccf5a0c043e7c8b83f6665b082401fc8bee -
Linux Linux 3.17 -

II. Public POCs for CVE-2025-40211

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III. Intelligence Information for CVE-2025-40211

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Same Patch Batch · Linux · 2025-11-21 · 3 CVEs total

CVE-2025-40210 7.5 HIGH Revert "NFSD: Remove the cap on number of operations per NFSv4 COMPOUND"
CVE-2025-40209 btrfs: fix memory leak of qgroup_list in btrfs_add_qgroup_relation

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-40211

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