CVE-2026-74547
hwmon: (adt7470) Fix busy-loop and I2C flooding in update thread
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.
INFO
Published Date :
Aug. 15, 2026, 1:18 p.m.
Last Modified :
Aug. 15, 2026, 1:18 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-74547
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update the lower limit for auto_update_interval to 500ms.
- Ensure adequate sleep windows between sensor updates.
- Monitor system resources and I2C bus activity.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-74547.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-74547 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-74547
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-74547 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-74547 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 15, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '89fac11cb3e7c5860c425dba14845c09ccede39d', 'lessThan': '1a42bd72a66205e439db1d1142442b62d393408a', 'versionType': 'git'}, {'status': 'affected', 'version': '89fac11cb3e7c5860c425dba14845c09ccede39d', 'lessThan': '38e6b5ce5794ff09442231cc171c2be5e900bab3', 'versionType': 'git'}, {'status': 'affected', 'version': '89fac11cb3e7c5860c425dba14845c09ccede39d', 'lessThan': '82d65f7ef11edcea0228745440b8b4b1f222c34c', 'versionType': 'git'}, {'status': 'affected', 'version': '89fac11cb3e7c5860c425dba14845c09ccede39d', 'lessThan': '5ea299c3aa42a827f6a863eeead6de3525bbb17a', 'versionType': 'git'}, {'status': 'affected', 'version': '89fac11cb3e7c5860c425dba14845c09ccede39d', 'lessThan': 'cb0b7f9c43b0abbd422a7e4c2c85e91db429207c', 'versionType': 'git'}], 'programFiles': ['drivers/hwmon/adt7470.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.29'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.29', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.151', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.103', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.44', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.8', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc6', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/hwmon/adt7470.c'], 'defaultStatus': 'affected'}] Added 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. Added Reference https://git.kernel.org/stable/c/1a42bd72a66205e439db1d1142442b62d393408a Added Reference https://git.kernel.org/stable/c/38e6b5ce5794ff09442231cc171c2be5e900bab3 Added Reference https://git.kernel.org/stable/c/5ea299c3aa42a827f6a863eeead6de3525bbb17a Added Reference https://git.kernel.org/stable/c/82d65f7ef11edcea0228745440b8b4b1f222c34c Added Reference https://git.kernel.org/stable/c/cb0b7f9c43b0abbd422a7e4c2c85e91db429207c