CVE-2022-50394 (GCVE-0-2022-50394)
Vulnerability from cvelistv5
Published
2025-09-18 13:33
Modified
2025-09-18 13:33
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9
Version: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9
Version: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9
Version: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9
Version: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9
Version: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9
Version: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9
Version: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9
Version: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/i2c/busses/i2c-ismt.c"
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      "descriptions": [
        {
          "lang": "en",
          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-18T13:33:12.992Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4a7bb1d93addb2f67e36fed00a53cb7f270d7b7a"
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          "url": "https://git.kernel.org/stable/c/03b7ef7a6c5ca1ff553470166b4919db88b810f6"
        },
        {
          "url": "https://git.kernel.org/stable/c/bfe41d966c860a8ad4c735639d616da270c92735"
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          "url": "https://git.kernel.org/stable/c/cdcbae2c5003747ddfd14e29db9c1d5d7e7c44dd"
        },
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          "url": "https://git.kernel.org/stable/c/9ac541a0898e8ec187a3fa7024b9701cffae6bf2"
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          "url": "https://git.kernel.org/stable/c/96c12fd0ec74641295e1c3c34dea3dce1b6c3422"
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          "url": "https://git.kernel.org/stable/c/a642469d464b2780a25a49b51ae56623c65eac34"
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          "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()",
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  "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": "2025-09-18T13:33:12.992Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50394\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-18T14:15:38.490\",\"lastModified\":\"2025-09-19T16:00:27.847\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/03b7ef7a6c5ca1ff553470166b4919db88b810f6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/233348a04becf133283f0076e20b317302de21d9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/39244cc754829bf707dccd12e2ce37510f5b1f8d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4a7bb1d93addb2f67e36fed00a53cb7f270d7b7a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/96c12fd0ec74641295e1c3c34dea3dce1b6c3422\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9ac541a0898e8ec187a3fa7024b9701cffae6bf2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a642469d464b2780a25a49b51ae56623c65eac34\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bfe41d966c860a8ad4c735639d616da270c92735\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cdcbae2c5003747ddfd14e29db9c1d5d7e7c44dd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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