FKIE_CVE-2026-68478

Vulnerability from fkie_nvd - Published: 2026-08-15 06:20 - Updated: 2026-08-17 06:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: memstick: ms_block: reject a card that reports too many blocks msb_ftl_initialize() computes the zone count from the card block count with no bound: msb->zone_count = msb->block_count / MS_BLOCKS_IN_ZONE; ... for (i = 0; i < msb->zone_count; i++) msb->free_block_count[i] = MS_BLOCKS_IN_ZONE; msb->block_count is a card value. msb_read_boot_blocks() reads number_of_blocks from the card boot page and byte swaps it. free_block_count is a fixed int[MS_MAX_ZONES]. MS_MAX_ZONES is 16, so the valid indices are 0 to 15. The init loop above indexes it by zone_count. msb_mark_block_used() and msb_mark_block_unused() index it by pba / MS_BLOCKS_IN_ZONE, for pba up to block_count - 1. A card may report up to 65535 blocks. A block_count above 8192 (MS_MAX_ZONES * MS_BLOCKS_IN_ZONE) lets the pba index reach 16. That writes past free_block_count[] and corrupts struct msb_data. A larger count runs the init loop past the end too. A real Memory Stick has at most 16 zones. So it has at most 8192 blocks. msb_ftl_initialize() now rejects a card that reports more than MS_MAX_ZONES * MS_BLOCKS_IN_ZONE blocks.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/39151f0708c84221e94cdd6aa070aba5d7cb1c01
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/47f0c7d856c67c9935546d2644f18c0d0131b449
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/718178f524b98bc920d74bc771aed823c8b81425
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8937b11f1c3896e066c3fb07387ba17bc8c50b8a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a4b9961efe8640f50800811b4a2b2046b3dc2ccc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b86666ac4009a252501cc17242582a7ec9ed976e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d5db3439ee8d1c165a09a47e984c4ba508c130df
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f1c675ecf6e5ad02722f0019f729d8bb588d502e
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/memstick/core/ms_block.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a4b9961efe8640f50800811b4a2b2046b3dc2ccc",
              "status": "affected",
              "version": "0ab30494bc4f3bc1ea4659b7c5d97c5218554a63",
              "versionType": "git"
            },
            {
              "lessThan": "8937b11f1c3896e066c3fb07387ba17bc8c50b8a",
              "status": "affected",
              "version": "0ab30494bc4f3bc1ea4659b7c5d97c5218554a63",
              "versionType": "git"
            },
            {
              "lessThan": "f1c675ecf6e5ad02722f0019f729d8bb588d502e",
              "status": "affected",
              "version": "0ab30494bc4f3bc1ea4659b7c5d97c5218554a63",
              "versionType": "git"
            },
            {
              "lessThan": "d5db3439ee8d1c165a09a47e984c4ba508c130df",
              "status": "affected",
              "version": "0ab30494bc4f3bc1ea4659b7c5d97c5218554a63",
              "versionType": "git"
            },
            {
              "lessThan": "b86666ac4009a252501cc17242582a7ec9ed976e",
              "status": "affected",
              "version": "0ab30494bc4f3bc1ea4659b7c5d97c5218554a63",
              "versionType": "git"
            },
            {
              "lessThan": "39151f0708c84221e94cdd6aa070aba5d7cb1c01",
              "status": "affected",
              "version": "0ab30494bc4f3bc1ea4659b7c5d97c5218554a63",
              "versionType": "git"
            },
            {
              "lessThan": "47f0c7d856c67c9935546d2644f18c0d0131b449",
              "status": "affected",
              "version": "0ab30494bc4f3bc1ea4659b7c5d97c5218554a63",
              "versionType": "git"
            },
            {
              "lessThan": "718178f524b98bc920d74bc771aed823c8b81425",
              "status": "affected",
              "version": "0ab30494bc4f3bc1ea4659b7c5d97c5218554a63",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/memstick/core/ms_block.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.12"
            },
            {
              "lessThan": "3.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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",
  "lastModified": "2026-08-17T06:17:57.333",
  "metrics": {},
  "published": "2026-08-15T06:20:47.573",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/39151f0708c84221e94cdd6aa070aba5d7cb1c01"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/47f0c7d856c67c9935546d2644f18c0d0131b449"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/718178f524b98bc920d74bc771aed823c8b81425"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8937b11f1c3896e066c3fb07387ba17bc8c50b8a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a4b9961efe8640f50800811b4a2b2046b3dc2ccc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b86666ac4009a252501cc17242582a7ec9ed976e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d5db3439ee8d1c165a09a47e984c4ba508c130df"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f1c675ecf6e5ad02722f0019f729d8bb588d502e"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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