hwmon: (adt7470) Fix busy-loop and I2C flooding in update thread
Summary
| CVE | CVE-2026-74547 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-15 13:18:00 UTC |
| Updated | 2026-08-19 17:21:09 UTC |
| 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. |
Risk And Classification
EPSS: 0.001680000 probability, percentile 0.066200000 (date 2026-08-19)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 89fac11cb3e7c5860c425dba14845c09ccede39d 2c4c4d7cadd10b50b5489183bbbb9eb95f6f8344 git | Not specified |
| CNA | Linux | Linux | affected 89fac11cb3e7c5860c425dba14845c09ccede39d 4dc1518f9cc57c6db99514cafeb02dd7117d5bda git | Not specified |
| CNA | Linux | Linux | affected 89fac11cb3e7c5860c425dba14845c09ccede39d 1325975a2eab265510e6036d8bf0c0068373d332 git | Not specified |
| CNA | Linux | Linux | affected 89fac11cb3e7c5860c425dba14845c09ccede39d 1a42bd72a66205e439db1d1142442b62d393408a git | Not specified |
| CNA | Linux | Linux | affected 89fac11cb3e7c5860c425dba14845c09ccede39d 38e6b5ce5794ff09442231cc171c2be5e900bab3 git | Not specified |
| CNA | Linux | Linux | affected 89fac11cb3e7c5860c425dba14845c09ccede39d 82d65f7ef11edcea0228745440b8b4b1f222c34c git | Not specified |
| CNA | Linux | Linux | affected 89fac11cb3e7c5860c425dba14845c09ccede39d 5ea299c3aa42a827f6a863eeead6de3525bbb17a git | Not specified |
| CNA | Linux | Linux | affected 89fac11cb3e7c5860c425dba14845c09ccede39d cb0b7f9c43b0abbd422a7e4c2c85e91db429207c git | Not specified |
| CNA | Linux | Linux | affected 2.6.29 | Not specified |
| CNA | Linux | Linux | unaffected 2.6.29 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.265 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.216 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.183 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.151 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.103 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.44 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1.8 7.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/1325975a2eab265510e6036d8bf0c0068373d332 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/4dc1518f9cc57c6db99514cafeb02dd7117d5bda | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/5ea299c3aa42a827f6a863eeead6de3525bbb17a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/38e6b5ce5794ff09442231cc171c2be5e900bab3 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/82d65f7ef11edcea0228745440b8b4b1f222c34c | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/cb0b7f9c43b0abbd422a7e4c2c85e91db429207c | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/2c4c4d7cadd10b50b5489183bbbb9eb95f6f8344 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/1a42bd72a66205e439db1d1142442b62d393408a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.