Improper input validation in Linux kernel - CVE-2026-74547

Vulnerability details

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper input validation in the adt7470 hwmon driver sysfs interface and background update thread when processing user-supplied sysfs configuration values. A local user can set 'auto_update_interval' to 0 and cause the update thread to enter a tight busy-loop and flood the I2C bus to cause a denial of service.

The issue requires access to sysfs attributes, and concurrent or prior configuration of 'num_temp_sensors' to 0 triggers the zero-delay temperature read path.

Affected software

How to mitigate CVE-2026-74547

External References

• 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

Related Security Bulletins

• Improper input validation in Linux kernel hwmon driver
• Debian update for linux