CVE-2025-68308 (GCVE-0-2025-68308)
Vulnerability from cvelistv5
Published
2025-12-16 15:06
Modified
2025-12-16 15:06
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
Impacted products
Vendor Product Version
Linux Linux Version: 7259124eac7d1b76b41c7a9cb2511a30556deebe
Version: 7259124eac7d1b76b41c7a9cb2511a30556deebe
Version: 7259124eac7d1b76b41c7a9cb2511a30556deebe
Version: 7259124eac7d1b76b41c7a9cb2511a30556deebe
Version: 7259124eac7d1b76b41c7a9cb2511a30556deebe
Version: 7259124eac7d1b76b41c7a9cb2511a30556deebe
Version: 7259124eac7d1b76b41c7a9cb2511a30556deebe
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c"
          ],
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          "programFiles": [
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          ],
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          "vendor": "Linux",
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              "lessThanOrEqual": "6.6.*",
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              "lessThanOrEqual": "6.17.*",
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              "version": "6.17.11",
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              "status": "unaffected",
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              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
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          "nodes": [
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                  "vulnerable": true
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              "operator": "OR"
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      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-16T15:06:25.081Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/58343e0a4d43699f0e2f5b169384bbe4c0217add"
        },
        {
          "url": "https://git.kernel.org/stable/c/69c7825df64e24dc15d31631a1fc9145324b1345"
        },
        {
          "url": "https://git.kernel.org/stable/c/028e89c7e8b4346302e88df01cc50e0a1f05791a"
        },
        {
          "url": "https://git.kernel.org/stable/c/e9dd83a75a7274edef21682c823bf0b66d7b6b7f"
        },
        {
          "url": "https://git.kernel.org/stable/c/0897cea266e39166a36111059ba147192b36592f"
        },
        {
          "url": "https://git.kernel.org/stable/c/bd8135a560cf6e64f0b98ed4daadf126a38f7f48"
        },
        {
          "url": "https://git.kernel.org/stable/c/0c73772cd2b8cc108d5f5334de89ad648d89b9ec"
        }
      ],
      "title": "can: kvaser_usb: leaf: Fix potential infinite loop in command parsers",
      "x_generator": {
        "engine": "bippy-1.2.0"
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68308",
    "datePublished": "2025-12-16T15:06:25.081Z",
    "dateReserved": "2025-12-16T14:48:05.294Z",
    "dateUpdated": "2025-12-16T15:06:25.081Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-68308\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-16T16:16:10.343\",\"lastModified\":\"2025-12-18T15:08:06.237\",\"vulnStatus\":\"Awaiting Analysis\",\"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.\"}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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