hwmon: (gpio-fan) Fix use-after-free in alarm work

Summary

In the Linux kernel, the following vulnerability has been resolved: hwmon: (gpio-fan) Fix use-after-free in alarm work fan_alarm_irq_handler() queues fan_data->alarm_work, but nothing cancels it. fan_alarm_notify() dereferences fan_data and its hwmon device. On unbind, devres frees the interrupt, which only waits for the handler itself, and then releases the hwmon device and fan_data, so a pending fan_alarm_notify() can run after those frees. Replace INIT_WORK() with devm_work_autocancel(), registered before devm_request_irq(). The devres cleanup then frees the interrupt first, so no new work can be queued, and cancels the work while fan_data and the hwmon device are still alive. This issue was found by an in-house static analysis tool.

Timeline

1. Sep 25, 2026, 10:22 AM UTCCVE published
2. Oct 19, 2026, 9:09 AM UTCRecord last updated

Affected versions

• Linux Linux

  From d6fe1360f42e86262153927986dea6502daff703 · fixed in 594c62eea7c82f526054496e9fa9b895122a8016; From d6fe1360f42e86262153927986dea6502daff703 · fixed in 6e67d9bdac810edacef78cbaeedd34445aa8ceb7; From d6fe1360f42e86262153927986dea6502daff703 · fixed in e9fc7d53b2eb34c0a607d1659f49b46911aaf16c; From d6fe1360f42e86262153927986dea6502daff703 · fixed in 9b12bd724db9db318e3a68be17693583dc29a066; From d6fe1360f42e86262153927986dea6502daff703 · fixed in 30755d3a5782cd704c8921cac8ee66dffe4383ea; From d6fe1360f42e86262153927986dea6502daff703 · fixed in c6ab7f855891877a16d2e2ddf0cd0305fd098a85; From d6fe1360f42e86262153927986dea6502daff703 · fixed in a2471ed17b0e6ff7bfb6b2ea8e6e5b04c309d293

• Linux Linux

  2.6.37

• KernelLinux

  From 2.6.37 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.111; From 6.13.0 · fixed in 6.18.53; From 6.19.0 · fixed in 7.2.7

References 7