FKIE_CVE-2026-31412

Vulnerability from fkie_nvd - Published: 2026-04-10 11:16 - Updated: 2026-05-20 15:54
Severity
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/228b37936376143f4b60cc6828663f6eaceb81b5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3428dc5520c811e66622b2f5fa43341bf9a1f8b3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/387ebb0453b99d71491419a5dc4ab4bee0cacbacPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8479891d1f04a8ce55366fe4ca361ccdb96f02e1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/91817ad5452defe69bc7bc0e355f0ed5d01125ccPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ce0caaed5940162780c5c223b8ae54968a5f059bPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
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      "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."
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          "baseScore": 5.5,
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          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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