FKIE_CVE-2026-74547

Vulnerability from fkie_nvd - Published: 2026-08-15 13:18 - Updated: 2026-08-19 17:21
Severity
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1325975a2eab265510e6036d8bf0c0068373d332
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1a42bd72a66205e439db1d1142442b62d393408a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2c4c4d7cadd10b50b5489183bbbb9eb95f6f8344
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/38e6b5ce5794ff09442231cc171c2be5e900bab3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4dc1518f9cc57c6db99514cafeb02dd7117d5bda
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5ea299c3aa42a827f6a863eeead6de3525bbb17a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/82d65f7ef11edcea0228745440b8b4b1f222c34c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cb0b7f9c43b0abbd422a7e4c2c85e91db429207c
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hwmon/adt7470.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2c4c4d7cadd10b50b5489183bbbb9eb95f6f8344",
              "status": "affected",
              "version": "89fac11cb3e7c5860c425dba14845c09ccede39d",
              "versionType": "git"
            },
            {
              "lessThan": "4dc1518f9cc57c6db99514cafeb02dd7117d5bda",
              "status": "affected",
              "version": "89fac11cb3e7c5860c425dba14845c09ccede39d",
              "versionType": "git"
            },
            {
              "lessThan": "1325975a2eab265510e6036d8bf0c0068373d332",
              "status": "affected",
              "version": "89fac11cb3e7c5860c425dba14845c09ccede39d",
              "versionType": "git"
            },
            {
              "lessThan": "1a42bd72a66205e439db1d1142442b62d393408a",
              "status": "affected",
              "version": "89fac11cb3e7c5860c425dba14845c09ccede39d",
              "versionType": "git"
            },
            {
              "lessThan": "38e6b5ce5794ff09442231cc171c2be5e900bab3",
              "status": "affected",
              "version": "89fac11cb3e7c5860c425dba14845c09ccede39d",
              "versionType": "git"
            },
            {
              "lessThan": "82d65f7ef11edcea0228745440b8b4b1f222c34c",
              "status": "affected",
              "version": "89fac11cb3e7c5860c425dba14845c09ccede39d",
              "versionType": "git"
            },
            {
              "lessThan": "5ea299c3aa42a827f6a863eeead6de3525bbb17a",
              "status": "affected",
              "version": "89fac11cb3e7c5860c425dba14845c09ccede39d",
              "versionType": "git"
            },
            {
              "lessThan": "cb0b7f9c43b0abbd422a7e4c2c85e91db429207c",
              "status": "affected",
              "version": "89fac11cb3e7c5860c425dba14845c09ccede39d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/hwmon/adt7470.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.29"
            },
            {
              "lessThan": "2.6.29",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.151",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-74547",
  "lastModified": "2026-08-19T17:21:09.567",
  "metrics": {},
  "published": "2026-08-15T13:18:00.057",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1325975a2eab265510e6036d8bf0c0068373d332"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1a42bd72a66205e439db1d1142442b62d393408a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2c4c4d7cadd10b50b5489183bbbb9eb95f6f8344"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/38e6b5ce5794ff09442231cc171c2be5e900bab3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4dc1518f9cc57c6db99514cafeb02dd7117d5bda"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5ea299c3aa42a827f6a863eeead6de3525bbb17a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/82d65f7ef11edcea0228745440b8b4b1f222c34c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cb0b7f9c43b0abbd422a7e4c2c85e91db429207c"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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