CVE-2026-74547 is a vulnerability in Linux Kernel
Published on August 15, 2026
hwmon: (adt7470) Fix busy-loop and I2C flooding in update thread
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.
Products Associated with CVE-2026-74547
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Affected Versions
Linux:- Version 89fac11cb3e7c5860c425dba14845c09ccede39d and below 1a42bd72a66205e439db1d1142442b62d393408a is affected.
- Version 89fac11cb3e7c5860c425dba14845c09ccede39d and below 38e6b5ce5794ff09442231cc171c2be5e900bab3 is affected.
- Version 89fac11cb3e7c5860c425dba14845c09ccede39d and below 82d65f7ef11edcea0228745440b8b4b1f222c34c is affected.
- Version 89fac11cb3e7c5860c425dba14845c09ccede39d and below 5ea299c3aa42a827f6a863eeead6de3525bbb17a is affected.
- Version 89fac11cb3e7c5860c425dba14845c09ccede39d and below cb0b7f9c43b0abbd422a7e4c2c85e91db429207c is affected.
- Version 2.6.29 is affected.
- Before 2.6.29 is unaffected.
- Version 6.6.151, <= 6.6.* is unaffected.
- Version 6.12.103, <= 6.12.* is unaffected.
- Version 6.18.44, <= 6.18.* is unaffected.
- Version 7.1.8, <= 7.1.* is unaffected.
- Version 7.2-rc6, <= * is unaffected.