CVE-2026-74547

Not scored yetLast modified Nov 6, 2026

Description

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.

Metrics

No CVSS score has been published yet.

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 89fac11cb3e7c5860c425dba14845c09ccede39d, < 2c4c4d7cadd10b50b5489183bbbb9eb95f6f8344; >= 89fac11cb3e7c5860c425dba14845c09ccede39d, < 4dc1518f9cc57c6db99514cafeb02dd7117d5bda; >= 89fac11cb3e7c5860c425dba14845c09ccede39d, < 1325975a2eab265510e6036d8bf0c0068373d332; >= 89fac11cb3e7c5860c425dba14845c09ccede39d, < 1a42bd72a66205e439db1d1142442b62d393408a; >= 89fac11cb3e7c5860c425dba14845c09ccede39d, < 38e6b5ce5794ff09442231cc171c2be5e900bab3; >= 89fac11cb3e7c5860c425dba14845c09ccede39d, < 82d65f7ef11edcea0228745440b8b4b1f222c34c; >= 89fac11cb3e7c5860c425dba14845c09ccede39d, < 5ea299c3aa42a827f6a863eeead6de3525bbb17a; >= 89fac11cb3e7c5860c425dba14845c09ccede39d, < cb0b7f9c43b0abbd422a7e4c2c85e91db429207c
LinuxLinux2.6.29

References

Timeline

Published
Aug 15, 2026
Last modified
Nov 6, 2026
NVD status
Received

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CVE-2026-74547: Unscored | Vulnix