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

hwmon: (adt7470) Fix busy-loop and I2C flooding in update thread

When userspace configures 'auto_update_interval' to 0 via sysfs, the
background kthread executes schedule_timeout_interruptible(0), which
returns immediately.

If 'num_temp_sensors' is concurrently or previously set to 0, the
msleep_interruptible() delay inside adt7470_read_temperatures() also
becomes 0. This combination forces the background thread into a tight,
unbounded busy-loop, hogging the CPU and flooding the I2C bus with a
continuous stream of transactions.

Fix this vulnerability by raising the lower limit of the clamp_val in
auto_update_interval_store() from 0 to 500 milliseconds. This guarantees
a reasonable minimum sleep window between sensor updates, protecting the
system from intentional or accidental I2C bus denial of service.

https://git.kernel.org/stable/c/1a42bd72a66205e439db1d1142442b62d393408a

https://git.kernel.org/stable/c/38e6b5ce5794ff09442231cc171c2be5e900bab3

https://git.kernel.org/stable/c/5ea299c3aa42a827f6a863eeead6de3525bbb17a

https://git.kernel.org/stable/c/82d65f7ef11edcea0228745440b8b4b1f222c34c

https://git.kernel.org/stable/c/cb0b7f9c43b0abbd422a7e4c2c85e91db429207c

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