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CVE-2026-97582: hwmon: (gpio-fan) Fix use-after-free in alarm work

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-25 · updated 2026-10-30

Description

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.

Affected products

• Linux: 2.6.37 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/30755d3a5782cd704c8921cac8ee66dffe4383ea
• https://git.kernel.org/stable/c/594c62eea7c82f526054496e9fa9b895122a8016
• https://git.kernel.org/stable/c/6e67d9bdac810edacef78cbaeedd34445aa8ceb7
• https://git.kernel.org/stable/c/7f96803f612134f585ab3b39e6d5b2d4b9c0606f
• https://git.kernel.org/stable/c/9b12bd724db9db318e3a68be17693583dc29a066
• https://git.kernel.org/stable/c/a2471ed17b0e6ff7bfb6b2ea8e6e5b04c309d293
• https://git.kernel.org/stable/c/c6ab7f855891877a16d2e2ddf0cd0305fd098a85
• https://git.kernel.org/stable/c/e9fc7d53b2eb34c0a607d1659f49b46911aaf16c

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