{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-68478",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-68478"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "memstick: ms_block: reject a card that reports too many blocks",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmemstick: ms_block: reject a card that reports too many blocks\n\nmsb_ftl_initialize() computes the zone count from the card block count\nwith no bound:\n\n\tmsb->zone_count = msb->block_count / MS_BLOCKS_IN_ZONE;\n\t...\n\tfor (i = 0; i < msb->zone_count; i++)\n\t\tmsb->free_block_count[i] = MS_BLOCKS_IN_ZONE;\n\nmsb->block_count is a card value. msb_read_boot_blocks() reads\nnumber_of_blocks from the card boot page and byte swaps it.\nfree_block_count is a fixed int[MS_MAX_ZONES]. MS_MAX_ZONES is 16, so the\nvalid indices are 0 to 15. The init loop above indexes it by zone_count.\nmsb_mark_block_used() and msb_mark_block_unused() index it by\npba / MS_BLOCKS_IN_ZONE, for pba up to block_count - 1. A card may report\nup to 65535 blocks. A block_count above 8192 (MS_MAX_ZONES *\nMS_BLOCKS_IN_ZONE) lets the pba index reach 16. That writes past\nfree_block_count[] and corrupts struct msb_data. A larger count runs the\ninit loop past the end too.\n\nA real Memory Stick has at most 16 zones. So it has at most 8192 blocks.\nmsb_ftl_initialize() now rejects a card that reports more than\nMS_MAX_ZONES * MS_BLOCKS_IN_ZONE blocks.",
  "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": "6.1.178",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-68478"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a4b9961efe8640f50800811b4a2b2046b3dc2ccc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8937b11f1c3896e066c3fb07387ba17bc8c50b8a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f1c675ecf6e5ad02722f0019f729d8bb588d502e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d5db3439ee8d1c165a09a47e984c4ba508c130df"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b86666ac4009a252501cc17242582a7ec9ed976e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/39151f0708c84221e94cdd6aa070aba5d7cb1c01"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/47f0c7d856c67c9935546d2644f18c0d0131b449"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/718178f524b98bc920d74bc771aed823c8b81425"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z"
  }
}