{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "0ab30494bc4f3bc1ea4659b7c5d97c5218554a63"
            },
            {
              "fixed": "a4b9961efe8640f50800811b4a2b2046b3dc2ccc"
            },
            {
              "fixed": "8937b11f1c3896e066c3fb07387ba17bc8c50b8a"
            },
            {
              "fixed": "f1c675ecf6e5ad02722f0019f729d8bb588d502e"
            },
            {
              "fixed": "d5db3439ee8d1c165a09a47e984c4ba508c130df"
            },
            {
              "fixed": "b86666ac4009a252501cc17242582a7ec9ed976e"
            },
            {
              "fixed": "39151f0708c84221e94cdd6aa070aba5d7cb1c01"
            },
            {
              "fixed": "47f0c7d856c67c9935546d2644f18c0d0131b449"
            },
            {
              "fixed": "718178f524b98bc920d74bc771aed823c8b81425"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.12.0"
            },
            {
              "fixed": "5.10.261"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.212"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68478.json"
  },
  "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-\u003ezone_count = msb-\u003eblock_count / MS_BLOCKS_IN_ZONE;\n\t...\n\tfor (i = 0; i \u003c msb-\u003ezone_count; i++)\n\t\tmsb-\u003efree_block_count[i] = MS_BLOCKS_IN_ZONE;\n\nmsb-\u003eblock_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.",
  "id": "CVE-2026-68478",
  "modified": "2026-08-18T03:31:01.717651174Z",
  "published": "2026-08-15T05:51:33.441Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/39151f0708c84221e94cdd6aa070aba5d7cb1c01"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/47f0c7d856c67c9935546d2644f18c0d0131b449"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/718178f524b98bc920d74bc771aed823c8b81425"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8937b11f1c3896e066c3fb07387ba17bc8c50b8a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a4b9961efe8640f50800811b4a2b2046b3dc2ccc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b86666ac4009a252501cc17242582a7ec9ed976e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d5db3439ee8d1c165a09a47e984c4ba508c130df"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f1c675ecf6e5ad02722f0019f729d8bb588d502e"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68478.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68478"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "memstick: ms_block: reject a card that reports too many blocks"
}