CVE-2026-74547

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux89fac11cb3e7c5860c425dba14845c09ccede39d < 1a42bd72a66205e439db1d1142442b62d393408aaffected
LinuxLinux89fac11cb3e7c5860c425dba14845c09ccede39d < 38e6b5ce5794ff09442231cc171c2be5e900bab3affected
LinuxLinux89fac11cb3e7c5860c425dba14845c09ccede39d < 82d65f7ef11edcea0228745440b8b4b1f222c34caffected
LinuxLinux89fac11cb3e7c5860c425dba14845c09ccede39d < 5ea299c3aa42a827f6a863eeead6de3525bbb17aaffected
LinuxLinux89fac11cb3e7c5860c425dba14845c09ccede39d < cb0b7f9c43b0abbd422a7e4c2c85e91db429207caffected
LinuxLinux2.6.29affected
LinuxLinux0 < 2.6.29unaffected
LinuxLinux6.6.151 <= 6.6.*unaffected
LinuxLinux6.12.103 <= 6.12.*unaffected
LinuxLinux6.18.44 <= 6.18.*unaffected
LinuxLinux7.1.8 <= 7.1.*unaffected
LinuxLinux7.2-rc6 <= *unaffected

Weaknesses

References