fkie_cve-2025-68308
Vulnerability from fkie_nvd
Published
2025-12-16 16:16
Modified
2025-12-18 15:08
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: can: kvaser_usb: leaf: Fix potential infinite loop in command parsers The `kvaser_usb_leaf_wait_cmd()` and `kvaser_usb_leaf_read_bulk_callback` functions contain logic to zero-length commands. These commands are used to align data to the USB endpoint's wMaxPacketSize boundary. The driver attempts to skip these placeholders by aligning the buffer position `pos` to the next packet boundary using `round_up()` function. However, if zero-length command is found exactly on a packet boundary (i.e., `pos` is a multiple of wMaxPacketSize, including 0), `round_up` function will return the unchanged value of `pos`. This prevents `pos` to be increased, causing an infinite loop in the parsing logic. This patch fixes this in the function by using `pos + 1` instead. This ensures that even if `pos` is on a boundary, the calculation is based on `pos + 1`, forcing `round_up()` to always return the next aligned boundary.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/028e89c7e8b4346302e88df01cc50e0a1f05791a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0897cea266e39166a36111059ba147192b36592f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0c73772cd2b8cc108d5f5334de89ad648d89b9ec
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/58343e0a4d43699f0e2f5b169384bbe4c0217add
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/69c7825df64e24dc15d31631a1fc9145324b1345
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bd8135a560cf6e64f0b98ed4daadf126a38f7f48
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e9dd83a75a7274edef21682c823bf0b66d7b6b7f
Impacted products
Vendor Product Version


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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: kvaser_usb: leaf: Fix potential infinite loop in command parsers\n\nThe `kvaser_usb_leaf_wait_cmd()` and `kvaser_usb_leaf_read_bulk_callback`\nfunctions contain logic to zero-length commands. These commands are used\nto align data to the USB endpoint\u0027s wMaxPacketSize boundary.\n\nThe driver attempts to skip these placeholders by aligning the buffer\nposition `pos` to the next packet boundary using `round_up()` function.\n\nHowever, if zero-length command is found exactly on a packet boundary\n(i.e., `pos` is a multiple of wMaxPacketSize, including 0), `round_up`\nfunction will return the unchanged value of `pos`. This prevents `pos`\nto be increased, causing an infinite loop in the parsing logic.\n\nThis patch fixes this in the function by using `pos + 1` instead.\nThis ensures that even if `pos` is on a boundary, the calculation is\nbased on `pos + 1`, forcing `round_up()` to always return the next\naligned boundary."
    }
  ],
  "id": "CVE-2025-68308",
  "lastModified": "2025-12-18T15:08:06.237",
  "metrics": {},
  "published": "2025-12-16T16:16:10.343",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/028e89c7e8b4346302e88df01cc50e0a1f05791a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0897cea266e39166a36111059ba147192b36592f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0c73772cd2b8cc108d5f5334de89ad648d89b9ec"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/58343e0a4d43699f0e2f5b169384bbe4c0217add"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/69c7825df64e24dc15d31631a1fc9145324b1345"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bd8135a560cf6e64f0b98ed4daadf126a38f7f48"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e9dd83a75a7274edef21682c823bf0b66d7b6b7f"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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