{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "144974e7f9e32b53b02f6c8632be45d8f43d6ab5"
            },
            {
              "fixed": "91817ad5452defe69bc7bc0e355f0ed5d01125cc"
            },
            {
              "fixed": "ce0caaed5940162780c5c223b8ae54968a5f059b"
            },
            {
              "fixed": "228b37936376143f4b60cc6828663f6eaceb81b5"
            },
            {
              "fixed": "3428dc5520c811e66622b2f5fa43341bf9a1f8b3"
            },
            {
              "fixed": "387ebb0453b99d71491419a5dc4ab4bee0cacbac"
            },
            {
              "fixed": "8479891d1f04a8ce55366fe4ca361ccdb96f02e1"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.3.0"
            },
            {
              "fixed": "6.1.167"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.130"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.78"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.19"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31412.json"
  },
  "details": "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.",
  "id": "CVE-2026-31412",
  "modified": "2026-07-08T05:37:04.696294230Z",
  "published": "2026-04-10T10:35:05.796Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/228b37936376143f4b60cc6828663f6eaceb81b5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3428dc5520c811e66622b2f5fa43341bf9a1f8b3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/387ebb0453b99d71491419a5dc4ab4bee0cacbac"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8479891d1f04a8ce55366fe4ca361ccdb96f02e1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/91817ad5452defe69bc7bc0e355f0ed5d01125cc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ce0caaed5940162780c5c223b8ae54968a5f059b"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31412.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31412"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "usb: gadget: f_mass_storage: Fix potential integer overflow in check_command_size_in_blocks()"
}