FKIE_CVE-2026-52948

Vulnerability from fkie_nvd - Published: 2026-06-24 17:17 - Updated: 2026-06-29 06:16
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: i2c: dev: prevent integer overflow in I2C_TIMEOUT ioctl While fuzzing with Syzkaller, a persistent `schedule_timeout: wrong timeout value` warning was observed, accompanied by SMBus controller state machine corruption. The I2C_TIMEOUT ioctl accepts a user-provided timeout in multiples of 10 ms. The user argument is checked against INT_MAX, but it is subsequently multiplied by 10 before being passed to msecs_to_jiffies(). A malicious user can pass a large value (e.g., 429496729) that passes the `arg > INT_MAX` check but overflows when multiplied by 10. This results in a truncated 32-bit unsigned value that bypasses the internal `(int)m < 0` check in `msecs_to_jiffies()`. The truncated value is then assigned to `client->adapter->timeout` (a signed 32-bit int), which is reinterpreted as a negative number. When passed to wait_for_completion_timeout(), this negative value undergoes sign extension to a 64-bit unsigned long, triggering the `schedule_timeout` warning and causing premature returns. This leaves the SMBus state machine in an unrecoverable state, constituting a local Denial of Service (DoS). Fix this by bounding the user argument to `INT_MAX / 10`. [wsa: move the comment as well]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0b88ecfbc9dc33b4db8836c37b50cf174e6c0691
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4576621dc6577f21a032acfd16c3ad61907a5ea7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/617eb7c0961a8dfcfc811844a6396e406b2923ea
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/943e318eedbeaeea08ece3f5dd44c982f4ed2ef5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aa6ef734016912653a909477fb30aeb66c98b3a2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e9ffd5f5050fbb199d270a85614cd27ebed6fbac
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ff02add34ffd03449b8115904ebe2ec4fed022d4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ffbcf31f032eb454ebfd29309f51366fe57f4ac4
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/i2c/i2c-dev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e9ffd5f5050fbb199d270a85614cd27ebed6fbac",
              "status": "affected",
              "version": "cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d",
              "versionType": "git"
            },
            {
              "lessThan": "0b88ecfbc9dc33b4db8836c37b50cf174e6c0691",
              "status": "affected",
              "version": "cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d",
              "versionType": "git"
            },
            {
              "lessThan": "943e318eedbeaeea08ece3f5dd44c982f4ed2ef5",
              "status": "affected",
              "version": "cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d",
              "versionType": "git"
            },
            {
              "lessThan": "aa6ef734016912653a909477fb30aeb66c98b3a2",
              "status": "affected",
              "version": "cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d",
              "versionType": "git"
            },
            {
              "lessThan": "ff02add34ffd03449b8115904ebe2ec4fed022d4",
              "status": "affected",
              "version": "cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d",
              "versionType": "git"
            },
            {
              "lessThan": "ffbcf31f032eb454ebfd29309f51366fe57f4ac4",
              "status": "affected",
              "version": "cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d",
              "versionType": "git"
            },
            {
              "lessThan": "4576621dc6577f21a032acfd16c3ad61907a5ea7",
              "status": "affected",
              "version": "cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d",
              "versionType": "git"
            },
            {
              "lessThan": "617eb7c0961a8dfcfc811844a6396e406b2923ea",
              "status": "affected",
              "version": "cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/i2c/i2c-dev.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": "5.10.259",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.94",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.36",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "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\ni2c: dev: prevent integer overflow in I2C_TIMEOUT ioctl\n\nWhile fuzzing with Syzkaller, a persistent `schedule_timeout: wrong\ntimeout value` warning was observed, accompanied by SMBus controller\nstate machine corruption.\n\nThe I2C_TIMEOUT ioctl accepts a user-provided timeout in multiples of\n10 ms. The user argument is checked against INT_MAX, but it is\nsubsequently multiplied by 10 before being passed to msecs_to_jiffies().\n\nA malicious user can pass a large value (e.g., 429496729) that passes\nthe `arg \u003e INT_MAX` check but overflows when multiplied by 10. This\nresults in a truncated 32-bit unsigned value that bypasses the\ninternal `(int)m \u003c 0` check in `msecs_to_jiffies()`.\n\nThe truncated value is then assigned to `client-\u003eadapter-\u003etimeout`\n(a signed 32-bit int), which is reinterpreted as a negative number.\nWhen passed to wait_for_completion_timeout(), this negative value\nundergoes sign extension to a 64-bit unsigned long, triggering the\n`schedule_timeout` warning and causing premature returns. This leaves\nthe SMBus state machine in an unrecoverable state, constituting a\nlocal Denial of Service (DoS).\n\nFix this by bounding the user argument to `INT_MAX / 10`.\n\n[wsa: move the comment as well]"
    }
  ],
  "id": "CVE-2026-52948",
  "lastModified": "2026-06-29T06:16:29.820",
  "metrics": {},
  "published": "2026-06-24T17:17:04.900",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0b88ecfbc9dc33b4db8836c37b50cf174e6c0691"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4576621dc6577f21a032acfd16c3ad61907a5ea7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/617eb7c0961a8dfcfc811844a6396e406b2923ea"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/943e318eedbeaeea08ece3f5dd44c982f4ed2ef5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/aa6ef734016912653a909477fb30aeb66c98b3a2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e9ffd5f5050fbb199d270a85614cd27ebed6fbac"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ff02add34ffd03449b8115904ebe2ec4fed022d4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ffbcf31f032eb454ebfd29309f51366fe57f4ac4"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}


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