CVE-2025-68308 (GCVE-0-2025-68308)

Vulnerability from cvelistv5 – Published: 2025-12-16 15:06 – Updated: 2026-05-11 21:50
VLAI
Title
can: kvaser_usb: leaf: Fix potential infinite loop in command parsers
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7259124eac7d1b76b41c7a9cb2511a30556deebe , < 58343e0a4d43699f0e2f5b169384bbe4c0217add (git)
Affected: 7259124eac7d1b76b41c7a9cb2511a30556deebe , < 69c7825df64e24dc15d31631a1fc9145324b1345 (git)
Affected: 7259124eac7d1b76b41c7a9cb2511a30556deebe , < 028e89c7e8b4346302e88df01cc50e0a1f05791a (git)
Affected: 7259124eac7d1b76b41c7a9cb2511a30556deebe , < e9dd83a75a7274edef21682c823bf0b66d7b6b7f (git)
Affected: 7259124eac7d1b76b41c7a9cb2511a30556deebe , < 0897cea266e39166a36111059ba147192b36592f (git)
Affected: 7259124eac7d1b76b41c7a9cb2511a30556deebe , < bd8135a560cf6e64f0b98ed4daadf126a38f7f48 (git)
Affected: 7259124eac7d1b76b41c7a9cb2511a30556deebe , < 0c73772cd2b8cc108d5f5334de89ad648d89b9ec (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.19
Unaffected: 0 , < 4.19 (semver)
Unaffected: 5.10.247 , ≤ 5.10.* (semver)
Unaffected: 5.15.197 , ≤ 5.15.* (semver)
Unaffected: 6.1.159 , ≤ 6.1.* (semver)
Unaffected: 6.6.119 , ≤ 6.6.* (semver)
Unaffected: 6.12.61 , ≤ 6.12.* (semver)
Unaffected: 6.17.11 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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        {
          "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": "2026-05-11T21:50:39.573Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/58343e0a4d43699f0e2f5b169384bbe4c0217add"
        },
        {
          "url": "https://git.kernel.org/stable/c/69c7825df64e24dc15d31631a1fc9145324b1345"
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        {
          "url": "https://git.kernel.org/stable/c/028e89c7e8b4346302e88df01cc50e0a1f05791a"
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          "url": "https://git.kernel.org/stable/c/e9dd83a75a7274edef21682c823bf0b66d7b6b7f"
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        {
          "url": "https://git.kernel.org/stable/c/0c73772cd2b8cc108d5f5334de89ad648d89b9ec"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68308",
    "datePublished": "2025-12-16T15:06:25.081Z",
    "dateReserved": "2025-12-16T14:48:05.294Z",
    "dateUpdated": "2026-05-11T21:50:39.573Z",
    "state": "PUBLISHED"
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      "date": "2026-10-30",
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      "percentile": "0.08801"
    },
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      "cve": "CVE-2025-68308",
      "id": "msrc_CVE-2025-68308",
      "initial_release_date": "2025-12-02T00:00:00.000Z",
      "product_status:fixed": "1",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "can: kvaser_usb: leaf: Fix potential infinite loop in command parsers",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-68308.json",
      "version": "2"
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                "vendor": "Linux",
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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."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncan: kvaser_usb: leaf: Correcci\u00f3n de un posible bucle infinito en los analizadores de comandos\n\nLas funciones \u0027kvaser_usb_leaf_wait_cmd()\u0027 y \u0027kvaser_usb_leaf_read_bulk_callback\u0027 contienen l\u00f3gica para comandos de longitud cero. Estos comandos se utilizan para alinear datos al l\u00edmite wMaxPacketSize del punto final USB.\n\nEl controlador intenta omitir estos marcadores de posici\u00f3n alineando la posici\u00f3n del b\u00fafer \u0027pos\u0027 al siguiente l\u00edmite de paquete utilizando la funci\u00f3n \u0027round_up()\u0027.\n\nSin embargo, si se encuentra un comando de longitud cero exactamente en un l\u00edmite de paquete (es decir, \u0027pos\u0027 es un m\u00faltiplo de wMaxPacketSize, incluyendo 0), la funci\u00f3n \u0027round_up\u0027 devolver\u00e1 el valor sin cambios de \u0027pos\u0027. Esto evita que \u0027pos\u0027 se incremente, causando un bucle infinito en la l\u00f3gica de an\u00e1lisis.\n\nEste parche corrige esto en la funci\u00f3n utilizando \u0027pos + 1\u0027 en su lugar. Esto asegura que, incluso si \u0027pos\u0027 est\u00e1 en un l\u00edmite, el c\u00e1lculo se base en \u0027pos + 1\u0027, forzando a \u0027round_up()\u0027 a devolver siempre el siguiente l\u00edmite alineado."
          }
        ],
        "id": "CVE-2025-68308",
        "lastModified": "2026-10-14T16:10:00.250",
        "metrics": {},
        "published": "2025-12-16T16:16:10.343",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          },
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            "url": "https://git.kernel.org/stable/c/58343e0a4d43699f0e2f5b169384bbe4c0217add"
          },
          {
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            "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": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:17:46+00:00",
      "cve": "CVE-2025-68308",
      "id": "CVE-2025-68308",
      "initial_release_date": "2025-12-16T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Denial of Service in kvaser_usb CAN driver due to infinite loop",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68308.json",
      "version": "3"
    }
  }
}



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