{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53306",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-53306"
  ],
  "published": "2026-06-26T19:40:50Z",
  "summary": "tty: hvc_iucv: fix off-by-one in number of supported devices",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: hvc_iucv: fix off-by-one in number of supported devices\n\nMAX_HVC_IUCV_LINES == HVC_ALLOC_TTY_ADAPTERS == 8.\nThis is the number of entries in:\n  static struct hvc_iucv_private *hvc_iucv_table[MAX_HVC_IUCV_LINES];\n\nSometimes hvc_iucv_table[] is limited by:\n(a)\tif (num > hvc_iucv_devices) // for error detection\nor\n(b)\tfor (i = 0; i < hvc_iucv_devices; i++) // in 2 places\n(so these 2 don't agree; second one appears to be correct to me.)\n\nhvc_iucv_devices can be 0..8. This is a counter.\n(c)\tif (hvc_iucv_devices > MAX_HVC_IUCV_LINES)\n\nIf hvc_iucv_devices == 8, (a) allows the code to access hvc_iucv_table[8].\nOops.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.175",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-53306"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3d3b89e6ab93bdd0efd45828bda6b0e61cc46dff"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/484357dff256c816d9466bda35eb765685e4dc86"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/11207e42a332eb8bbcb9fe74df9edd2a807c5607"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fed8b8f33a46db0ee2efdb000f4f630c86ed8ca4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a76511bc654819425d3b15e77b523d7f9d81f064"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3104a3f40feb107f77d7116ad9bf6c210ab7babf"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f1dc8e72de9aabe5d96767a4e97219ac26b79fe5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f2a880e802ad12d1e38039d1334fb1475d0f5241"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-06-26T19:40:50Z"
  }
}