CVE-2026-31412 (GCVE-0-2026-31412)

Vulnerability from cvelistv5 – Published: 2026-04-10 10:35 – Updated: 2026-04-10 10:35
VLAI?
Title
usb: gadget: f_mass_storage: Fix potential integer overflow in check_command_size_in_blocks()
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_mass_storage: Fix potential integer overflow in check_command_size_in_blocks() The `check_command_size_in_blocks()` function calculates the data size in bytes by left shifting `common->data_size_from_cmnd` by the block size (`common->curlun->blkbits`). However, it does not validate whether this shift operation will cause an integer overflow. Initially, the block size is set up in `fsg_lun_open()` , and the `common->data_size_from_cmnd` is set up in `do_scsi_command()`. During initialization, there is no integer overflow check for the interaction between two variables. So if a malicious USB host sends a SCSI READ or WRITE command requesting a large amount of data (`common->data_size_from_cmnd`), the left shift operation can wrap around. This results in a truncated data size, which can bypass boundary checks and potentially lead to memory corruption or out-of-bounds accesses. Fix this by using the check_shl_overflow() macro to safely perform the shift and catch any overflows.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 144974e7f9e32b53b02f6c8632be45d8f43d6ab5 , < 91817ad5452defe69bc7bc0e355f0ed5d01125cc (git)
Affected: 144974e7f9e32b53b02f6c8632be45d8f43d6ab5 , < ce0caaed5940162780c5c223b8ae54968a5f059b (git)
Affected: 144974e7f9e32b53b02f6c8632be45d8f43d6ab5 , < 228b37936376143f4b60cc6828663f6eaceb81b5 (git)
Affected: 144974e7f9e32b53b02f6c8632be45d8f43d6ab5 , < 3428dc5520c811e66622b2f5fa43341bf9a1f8b3 (git)
Affected: 144974e7f9e32b53b02f6c8632be45d8f43d6ab5 , < 387ebb0453b99d71491419a5dc4ab4bee0cacbac (git)
Affected: 144974e7f9e32b53b02f6c8632be45d8f43d6ab5 , < 8479891d1f04a8ce55366fe4ca361ccdb96f02e1 (git)
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    Linux Linux Affected: 3.3
Unaffected: 0 , < 3.3 (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.19 , ≤ 6.18.* (semver)
Unaffected: 6.19.9 , ≤ 6.19.* (semver)
Unaffected: 7.0-rc4 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_mass_storage.c"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_mass_storage: Fix potential integer overflow in check_command_size_in_blocks()\n\nThe `check_command_size_in_blocks()` function calculates the data size\nin bytes by left shifting `common-\u003edata_size_from_cmnd` by the block\nsize (`common-\u003ecurlun-\u003eblkbits`). However, it does not validate whether\nthis shift operation will cause an integer overflow.\n\nInitially, the block size is set up in `fsg_lun_open()` , and the\n`common-\u003edata_size_from_cmnd` is set up in `do_scsi_command()`. During\ninitialization, there is no integer overflow check for the interaction\nbetween two variables.\n\nSo if a malicious USB host sends a SCSI READ or WRITE command\nrequesting a large amount of data (`common-\u003edata_size_from_cmnd`), the\nleft shift operation can wrap around. This results in a truncated data\nsize, which can bypass boundary checks and potentially lead to memory\ncorruption or out-of-bounds accesses.\n\nFix this by using the check_shl_overflow() macro to safely perform the\nshift and catch any overflows."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-10T10:35:05.796Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/387ebb0453b99d71491419a5dc4ab4bee0cacbac"
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        {
          "url": "https://git.kernel.org/stable/c/8479891d1f04a8ce55366fe4ca361ccdb96f02e1"
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      ],
      "title": "usb: gadget: f_mass_storage: Fix potential integer overflow in check_command_size_in_blocks()",
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    "cveId": "CVE-2026-31412",
    "datePublished": "2026-04-10T10:35:05.796Z",
    "dateReserved": "2026-03-09T15:48:24.087Z",
    "dateUpdated": "2026-04-10T10:35:05.796Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31412\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-10T11:16:22.967\",\"lastModified\":\"2026-04-10T11:16:22.967\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nusb: gadget: f_mass_storage: Fix potential integer overflow in check_command_size_in_blocks()\\n\\nThe `check_command_size_in_blocks()` function calculates the data size\\nin bytes by left shifting `common-\u003edata_size_from_cmnd` by the block\\nsize (`common-\u003ecurlun-\u003eblkbits`). However, it does not validate whether\\nthis shift operation will cause an integer overflow.\\n\\nInitially, the block size is set up in `fsg_lun_open()` , and the\\n`common-\u003edata_size_from_cmnd` is set up in `do_scsi_command()`. During\\ninitialization, there is no integer overflow check for the interaction\\nbetween two variables.\\n\\nSo if a malicious USB host sends a SCSI READ or WRITE command\\nrequesting a large amount of data (`common-\u003edata_size_from_cmnd`), the\\nleft shift operation can wrap around. This results in a truncated data\\nsize, which can bypass boundary checks and potentially lead to memory\\ncorruption or out-of-bounds accesses.\\n\\nFix this by using the check_shl_overflow() macro to safely perform the\\nshift and catch any overflows.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/228b37936376143f4b60cc6828663f6eaceb81b5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3428dc5520c811e66622b2f5fa43341bf9a1f8b3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/387ebb0453b99d71491419a5dc4ab4bee0cacbac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8479891d1f04a8ce55366fe4ca361ccdb96f02e1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/91817ad5452defe69bc7bc0e355f0ed5d01125cc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ce0caaed5940162780c5c223b8ae54968a5f059b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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