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CVE-2022-50394 (GCVE-0-2022-50394)

Vulnerability from cvelistv5 – Published: 2025-09-18 13:33 – Updated: 2026-08-05 08:58
VLAI
Title
i2c: ismt: Fix an out-of-bounds bug in ismt_access()
Summary
In the Linux kernel, the following vulnerability has been resolved: i2c: ismt: Fix an out-of-bounds bug in ismt_access() When the driver does not check the data from the user, the variable 'data->block[0]' may be very large to cause an out-of-bounds bug. The following log can reveal it: [ 33.995542] i2c i2c-1: ioctl, cmd=0x720, arg=0x7ffcb3dc3a20 [ 33.995978] ismt_smbus 0000:00:05.0: I2C_SMBUS_BLOCK_DATA: WRITE [ 33.996475] ================================================================== [ 33.996995] BUG: KASAN: out-of-bounds in ismt_access.cold+0x374/0x214b [ 33.997473] Read of size 18446744073709551615 at addr ffff88810efcfdb1 by task ismt_poc/485 [ 33.999450] Call Trace: [ 34.001849] memcpy+0x20/0x60 [ 34.002077] ismt_access.cold+0x374/0x214b [ 34.003382] __i2c_smbus_xfer+0x44f/0xfb0 [ 34.004007] i2c_smbus_xfer+0x10a/0x390 [ 34.004291] i2cdev_ioctl_smbus+0x2c8/0x710 [ 34.005196] i2cdev_ioctl+0x5ec/0x74c Fix this bug by checking the size of 'data->block[0]' first.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 18:51 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 , < 4a7bb1d93addb2f67e36fed00a53cb7f270d7b7a (git)
Affected: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 , < 03b7ef7a6c5ca1ff553470166b4919db88b810f6 (git)
Affected: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 , < bfe41d966c860a8ad4c735639d616da270c92735 (git)
Affected: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 , < cdcbae2c5003747ddfd14e29db9c1d5d7e7c44dd (git)
Affected: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 , < 9ac541a0898e8ec187a3fa7024b9701cffae6bf2 (git)
Affected: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 , < 96c12fd0ec74641295e1c3c34dea3dce1b6c3422 (git)
Affected: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 , < a642469d464b2780a25a49b51ae56623c65eac34 (git)
Affected: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 , < 233348a04becf133283f0076e20b317302de21d9 (git)
Affected: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 , < 39244cc754829bf707dccd12e2ce37510f5b1f8d (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.9
Unaffected: 0 , < 3.9 (semver)
Unaffected: 4.9.337 , ≤ 4.9.* (semver)
Unaffected: 4.14.303 , ≤ 4.14.* (semver)
Unaffected: 4.19.270 , ≤ 4.19.* (semver)
Unaffected: 5.4.229 , ≤ 5.4.* (semver)
Unaffected: 5.10.163 , ≤ 5.10.* (semver)
Unaffected: 5.15.86 , ≤ 5.15.* (semver)
Unaffected: 6.0.16 , ≤ 6.0.* (semver)
Unaffected: 6.1.2 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ni2c: ismt: Fix an out-of-bounds bug in ismt_access()\n\nWhen the driver does not check the data from the user, the variable\n\u0027data-\u003eblock[0]\u0027 may be very large to cause an out-of-bounds bug.\n\nThe following log can reveal it:\n\n[   33.995542] i2c i2c-1: ioctl, cmd=0x720, arg=0x7ffcb3dc3a20\n[   33.995978] ismt_smbus 0000:00:05.0: I2C_SMBUS_BLOCK_DATA:  WRITE\n[   33.996475] ==================================================================\n[   33.996995] BUG: KASAN: out-of-bounds in ismt_access.cold+0x374/0x214b\n[   33.997473] Read of size 18446744073709551615 at addr ffff88810efcfdb1 by task ismt_poc/485\n[   33.999450] Call Trace:\n[   34.001849]  memcpy+0x20/0x60\n[   34.002077]  ismt_access.cold+0x374/0x214b\n[   34.003382]  __i2c_smbus_xfer+0x44f/0xfb0\n[   34.004007]  i2c_smbus_xfer+0x10a/0x390\n[   34.004291]  i2cdev_ioctl_smbus+0x2c8/0x710\n[   34.005196]  i2cdev_ioctl+0x5ec/0x74c\n\nFix this bug by checking the size of \u0027data-\u003eblock[0]\u0027 first."
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              "url": "https://git.kernel.org/stable/c/bfe41d966c860a8ad4c735639d616da270c92735"
            },
            {
              "url": "https://git.kernel.org/stable/c/cdcbae2c5003747ddfd14e29db9c1d5d7e7c44dd"
            },
            {
              "url": "https://git.kernel.org/stable/c/9ac541a0898e8ec187a3fa7024b9701cffae6bf2"
            },
            {
              "url": "https://git.kernel.org/stable/c/96c12fd0ec74641295e1c3c34dea3dce1b6c3422"
            },
            {
              "url": "https://git.kernel.org/stable/c/a642469d464b2780a25a49b51ae56623c65eac34"
            },
            {
              "url": "https://git.kernel.org/stable/c/233348a04becf133283f0076e20b317302de21d9"
            },
            {
              "url": "https://git.kernel.org/stable/c/39244cc754829bf707dccd12e2ce37510f5b1f8d"
            }
          ],
          "title": "i2c: ismt: Fix an out-of-bounds bug in ismt_access()",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2022-50394",
        "datePublished": "2025-09-18T13:33:12.992Z",
        "dateReserved": "2025-09-17T14:53:06.998Z",
        "dateUpdated": "2026-05-11T19:18:41.200Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.