CVE-2026-68478 (GCVE-0-2026-68478)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:51 – Updated: 2026-08-17 05:06
VLAI
Title
memstick: ms_block: reject a card that reports too many blocks
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0ab30494bc4f3bc1ea4659b7c5d97c5218554a63 , < a4b9961efe8640f50800811b4a2b2046b3dc2ccc (git)
Affected: 0ab30494bc4f3bc1ea4659b7c5d97c5218554a63 , < 8937b11f1c3896e066c3fb07387ba17bc8c50b8a (git)
Affected: 0ab30494bc4f3bc1ea4659b7c5d97c5218554a63 , < f1c675ecf6e5ad02722f0019f729d8bb588d502e (git)
Affected: 0ab30494bc4f3bc1ea4659b7c5d97c5218554a63 , < d5db3439ee8d1c165a09a47e984c4ba508c130df (git)
Affected: 0ab30494bc4f3bc1ea4659b7c5d97c5218554a63 , < b86666ac4009a252501cc17242582a7ec9ed976e (git)
Affected: 0ab30494bc4f3bc1ea4659b7c5d97c5218554a63 , < 39151f0708c84221e94cdd6aa070aba5d7cb1c01 (git)
Affected: 0ab30494bc4f3bc1ea4659b7c5d97c5218554a63 , < 47f0c7d856c67c9935546d2644f18c0d0131b449 (git)
Affected: 0ab30494bc4f3bc1ea4659b7c5d97c5218554a63 , < 718178f524b98bc920d74bc771aed823c8b81425 (git)
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Linux Linux Affected: 3.12
Unaffected: 0 , < 3.12 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:06:21.136Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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        {
          "url": "https://git.kernel.org/stable/c/8937b11f1c3896e066c3fb07387ba17bc8c50b8a"
        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/718178f524b98bc920d74bc771aed823c8b81425"
        }
      ],
      "title": "memstick: ms_block: reject a card that reports too many blocks",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68478",
    "datePublished": "2026-08-15T05:51:33.441Z",
    "dateReserved": "2026-07-30T09:28:09.397Z",
    "dateUpdated": "2026-08-17T05:06:21.136Z",
    "state": "PUBLISHED"
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            "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",
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            "url": "https://git.kernel.org/stable/c/b86666ac4009a252501cc17242582a7ec9ed976e"
          },
          {
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            "url": "https://git.kernel.org/stable/c/d5db3439ee8d1c165a09a47e984c4ba508c130df"
          },
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            "url": "https://git.kernel.org/stable/c/f1c675ecf6e5ad02722f0019f729d8bb588d502e"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T16:04:56+00:00",
      "cve": "CVE-2026-68478",
      "id": "CVE-2026-68478",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: memstick: ms_block: reject a card that reports too many blocks",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68478.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-10T02:12:25Z",
      "cve": "CVE-2026-68478",
      "id": "CVE-2026-68478",
      "initial_release_date": "2026-08-26T01:15:17Z",
      "product_status:known_affected": "265",
      "product_status:known_not_affected": "97",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68478",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68478.json",
      "version": "3"
    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.