hwmon: (adt7470) Fix busy-loop and I2C flooding in update thread
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
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.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
Version range not reported
- Linux Linux
2.6.29
References 8
git.kernel.org
- stable/c/2c4c4d7cadd10b50b5489183bbbb9eb95f6f8344
- stable/c/4dc1518f9cc57c6db99514cafeb02dd7117d5bda
- stable/c/1325975a2eab265510e6036d8bf0c0068373d332
- stable/c/1a42bd72a66205e439db1d1142442b62d393408a
- stable/c/38e6b5ce5794ff09442231cc171c2be5e900bab3
- stable/c/82d65f7ef11edcea0228745440b8b4b1f222c34c
- stable/c/5ea299c3aa42a827f6a863eeead6de3525bbb17a
- stable/c/cb0b7f9c43b0abbd422a7e4c2c85e91db429207c