CVE-2026-98197

hwmon: (w83791d) remove fan/pwm 4-5 sysfs group on remove

State: Published
Severity: 7.0 High
Published: Oct 6, 2026
Updated: Oct 19, 2026
Reserved: Sep 25, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

hwmon: (w83791d) remove fan/pwm 4-5 sysfs group on remove

When the fan/pwm 4-5 pins are not used as GPIO, w83791d_probe() creates the w83791d_group_fanpwm45 sysfs group on the I2C client device.

The probe error path removes this group when a later initialization step fails, but the normal remove path only removes w83791d_group. As a result, the optional fan/pwm 4-5 sysfs files can remain after the driver is unbound.

The callbacks associated with these files access the driver data, which is devm allocated and released after driver unbind. Leaving the sysfs files behind can therefore result in accesses to stale driver data.

Remove w83791d_group_fanpwm45 during normal teardown as well.

This issue was found by manual code inspection.

Scores

CVSS	Score	Vector	Source
3.1	7.0 High	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	6e1ecd9b8f1358ed4d099f0c54434240dc40debe to before 081e3a78453635fb370b1712809d2af29e60b4c5Affected 6e1ecd9b8f1358ed4d099f0c54434240dc40debe to before b1d419eb3bc41245c3d3d99dfe1a7b6c45989586Affected 6e1ecd9b8f1358ed4d099f0c54434240dc40debe to before 2ccf6c512290a288a2d4d7f076430dfb0c6ee476Affected 6e1ecd9b8f1358ed4d099f0c54434240dc40debe to before f6e2ab72f32d16d71a2549c7ea062dd209f71670Affected 6e1ecd9b8f1358ed4d099f0c54434240dc40debe to before 2dd37d00f1f1af8e02ffa70ee573c10fd1a76864Affected 6e1ecd9b8f1358ed4d099f0c54434240dc40debe to before 2c381e6e0f033f2df13bd64905e7232c42f49009Affected 6e1ecd9b8f1358ed4d099f0c54434240dc40debe to before 583e04e88e75b8d57304015d83c38e82a9531600Affected 6e1ecd9b8f1358ed4d099f0c54434240dc40debe to before 0ff9c7775e51ac6d47b1bb5c46f06b1434fe58a8Affected
LinuxLinux	2.6.28Affected before 2.6.28Not affected 5.10.271 through 5.10.Not affected 5.15.222 through 5.15.Not affected 6.1.189 through 6.1.Not affected 6.6.158 through 6.6.Not affected 6.12.112 through 6.12.Not affected 6.18.54 through 6.18.Not affected 7.2.8 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

6e1ecd9b8f1358ed4d099f0c54434240dc40debe to before 081e3a78453635fb370b1712809d2af29e60b4c5Affected
6e1ecd9b8f1358ed4d099f0c54434240dc40debe to before b1d419eb3bc41245c3d3d99dfe1a7b6c45989586Affected
6e1ecd9b8f1358ed4d099f0c54434240dc40debe to before 2ccf6c512290a288a2d4d7f076430dfb0c6ee476Affected
6e1ecd9b8f1358ed4d099f0c54434240dc40debe to before f6e2ab72f32d16d71a2549c7ea062dd209f71670Affected
6e1ecd9b8f1358ed4d099f0c54434240dc40debe to before 2dd37d00f1f1af8e02ffa70ee573c10fd1a76864Affected
6e1ecd9b8f1358ed4d099f0c54434240dc40debe to before 2c381e6e0f033f2df13bd64905e7232c42f49009Affected
6e1ecd9b8f1358ed4d099f0c54434240dc40debe to before 583e04e88e75b8d57304015d83c38e82a9531600Affected
6e1ecd9b8f1358ed4d099f0c54434240dc40debe to before 0ff9c7775e51ac6d47b1bb5c46f06b1434fe58a8Affected

LinuxLinux

2.6.28Affected
before 2.6.28Not affected
5.10.271 through 5.10.*Not affected
5.15.222 through 5.15.*Not affected
6.1.189 through 6.1.*Not affected
6.6.158 through 6.6.*Not affected
6.12.112 through 6.12.*Not affected
6.18.54 through 6.18.*Not affected
7.2.8 through 7.2.*Not affected
7.3 and laterNot affected

References

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