CVE-2026-98197
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.
How to fix
- Linux Linux081e3a78453635fb370b1712809d2af29e60b4c5, b1d419eb3bc41245c3d3d99dfe1a7b6c45989586, 2ccf6c512290a288a2d4d7f076430dfb0c6ee476, f6e2ab72f32d16d71a2549c7ea062dd209f71670, 2dd37d00f1f1af8e02ffa70ee573c10fd1a76864, 2c381e6e0f033f2df13bd64905e7232c42f49009, 583e04e88e75b8d57304015d83c38e82a9531600, 0ff9c7775e51ac6d47b1bb5c46f06b1434fe58a8 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 6e1ecd9b8f1358ed4d099f0c54434240dc40debe ≤ v < 081e3a78453635fb370b1712809d2af29e60b4c5, 6e1ecd9b8f1358ed4d099f0c54434240dc40debe ≤ v < b1d419eb3bc41245c3d3d99dfe1a7b6c45989586, 6e1ecd9b8f1358ed4d099f0c54434240dc40debe ≤ v < 2ccf6c512290a288a2d4d7f076430dfb0c6ee476, 6e1ecd9b8f1358ed4d099f0c54434240dc40debe ≤ v < f6e2ab72f32d16d71a2549c7ea062dd209f71670, 6e1ecd9b8f1358ed4d099f0c54434240dc40debe ≤ v < 2dd37d00f1f1af8e02ffa70ee573c10fd1a76864, 6e1ecd9b8f1358ed4d099f0c54434240dc40debe ≤ v < 2c381e6e0f033f2df13bd64905e7232c42f49009, 6e1ecd9b8f1358ed4d099f0c54434240dc40debe ≤ v < 583e04e88e75b8d57304015d83c38e82a9531600, 6e1ecd9b8f1358ed4d099f0c54434240dc40debe ≤ v < 0ff9c7775e51ac6d47b1bb5c46f06b1434fe58a8, 2.6.28 | 081e3a78453635fb370b1712809d2af29e60b4c5, b1d419eb3bc41245c3d3d99dfe1a7b6c45989586, 2ccf6c512290a288a2d4d7f076430dfb0c6ee476, f6e2ab72f32d16d71a2549c7ea062dd209f71670, 2dd37d00f1f1af8e02ffa70ee573c10fd1a76864, 2c381e6e0f033f2df13bd64905e7232c42f49009, 583e04e88e75b8d57304015d83c38e82a9531600, 0ff9c7775e51ac6d47b1bb5c46f06b1434fe58a8 |
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