CVE-2026-74547 (GCVE-0-2026-74547)
Vulnerability from cvelistv5
Published
2026-08-15 12:27
Modified
2026-08-19 16:38
Severity ?
VLAI Severity ?
EPSS score ?
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 89fac11cb3e7c5860c425dba14845c09ccede39d Version: 89fac11cb3e7c5860c425dba14845c09ccede39d Version: 89fac11cb3e7c5860c425dba14845c09ccede39d Version: 89fac11cb3e7c5860c425dba14845c09ccede39d Version: 89fac11cb3e7c5860c425dba14845c09ccede39d Version: 89fac11cb3e7c5860c425dba14845c09ccede39d Version: 89fac11cb3e7c5860c425dba14845c09ccede39d Version: 89fac11cb3e7c5860c425dba14845c09ccede39d |
||
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"version": "0",
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{
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{
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (adt7470) Fix busy-loop and I2C flooding in update thread\n\nWhen userspace configures \u0027auto_update_interval\u0027 to 0 via sysfs, the\nbackground kthread executes schedule_timeout_interruptible(0), which\nreturns immediately.\n\nIf \u0027num_temp_sensors\u0027 is concurrently or previously set to 0, the\nmsleep_interruptible() delay inside adt7470_read_temperatures() also\nbecomes 0. This combination forces the background thread into a tight,\nunbounded busy-loop, hogging the CPU and flooding the I2C bus with a\ncontinuous stream of transactions.\n\nFix this vulnerability by raising the lower limit of the clamp_val in\nauto_update_interval_store() from 0 to 500 milliseconds. This guarantees\na reasonable minimum sleep window between sensor updates, protecting the\nsystem from intentional or accidental I2C bus denial of service."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:38:37.219Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"url": "https://git.kernel.org/stable/c/2c4c4d7cadd10b50b5489183bbbb9eb95f6f8344"
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{
"url": "https://git.kernel.org/stable/c/4dc1518f9cc57c6db99514cafeb02dd7117d5bda"
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{
"url": "https://git.kernel.org/stable/c/1325975a2eab265510e6036d8bf0c0068373d332"
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{
"url": "https://git.kernel.org/stable/c/1a42bd72a66205e439db1d1142442b62d393408a"
},
{
"url": "https://git.kernel.org/stable/c/38e6b5ce5794ff09442231cc171c2be5e900bab3"
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{
"url": "https://git.kernel.org/stable/c/82d65f7ef11edcea0228745440b8b4b1f222c34c"
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{
"url": "https://git.kernel.org/stable/c/5ea299c3aa42a827f6a863eeead6de3525bbb17a"
},
{
"url": "https://git.kernel.org/stable/c/cb0b7f9c43b0abbd422a7e4c2c85e91db429207c"
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],
"title": "hwmon: (adt7470) Fix busy-loop and I2C flooding in update thread",
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"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-74547",
"datePublished": "2026-08-15T12:27:55.777Z",
"dateReserved": "2026-08-15T05:44:03.915Z",
"dateUpdated": "2026-08-19T16:38:37.219Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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