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CVE-2025-38235— HID: appletb-kbd: fix "appletb_backlight" backlight device reference counting

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appletb-kbd驱动中backlight设备引用计数未释放。

AI Predicted 5.5 Difficulty: Theoretical EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1562.002

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux 93a0fc48948107e0cc34e1de22c3cb363a8f2783< 751d5437112a3f387de4ef6d2d1c131068ff7627 affected
93a0fc48948107e0cc34e1de22c3cb363a8f2783< 4540e41e753a7d69ecd3f5bad51fe620205c3a18 affected
6.15 affected
< 6.15 unaffected
6.15.5≤ 6.15.* unaffected
6.16≤ * unaffected
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I. Basic Information for CVE-2025-38235

Vulnerability Information
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Vulnerability Title
HID: appletb-kbd: fix "appletb_backlight" backlight device reference counting
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: HID: appletb-kbd: fix "appletb_backlight" backlight device reference counting During appletb_kbd_probe, probe attempts to get the backlight device by name. When this happens backlight_device_get_by_name looks for a device in the backlight class which has name "appletb_backlight" and upon finding a match it increments the reference count for the device and returns it to the caller. However this reference is never released leading to a reference leak. Fix this by decrementing the backlight device reference count on removal via put_device and on probe failure.
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appletb-kbd驱动中backlight设备引用计数未释放。
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 93a0fc48948107e0cc34e1de22c3cb363a8f2783 ~ 751d5437112a3f387de4ef6d2d1c131068ff7627 -
Linux Linux 6.15 -

II. Public POCs for CVE-2025-38235

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III. Intelligence Information for CVE-2025-38235

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IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-38235

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