CVE-2026-98634 (GCVE-0-2026-98634)
Vulnerability from cvelistv5
Published
2026-10-18 15:20
Modified
2026-10-19 09:23
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: sd_zbc: Reject disks with too many zones sd_zbc_read_zones() computes the number of zones with 64-bit arithmetic and stores the result in the unsigned int nr_zones field of struct zoned_disk_info, silently truncating counts that exceed 32 bits. The truncated count is later used to size per-zone resources, while the device may still report more zones than fit. Moreover, sd_zbc_report_zones() counts the reported zones with a signed int zone_idx, which overflows past INT_MAX. Reject devices reporting more than INT_MAX zones at scan time; such a device is not realistic for any medium that exists today, and accepting it produces inconsistent zone bookkeeping.
References
Impacted products
Vendor Product Version
Linux Linux Version: 89d9475610771b5e5fe1879075f0fc9ba6e3755f
Version: 89d9475610771b5e5fe1879075f0fc9ba6e3755f
Version: 89d9475610771b5e5fe1879075f0fc9ba6e3755f
Version: 89d9475610771b5e5fe1879075f0fc9ba6e3755f
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/scsi/sd_zbc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d8791ae55d85dfaeafa20ea48365482a0cc5a107",
              "status": "affected",
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              "versionType": "git"
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              "versionType": "git"
            },
            {
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/scsi/sd_zbc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.10"
            },
            {
              "lessThan": "4.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.55",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.112",
                  "versionStartIncluding": "4.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.55",
                  "versionStartIncluding": "4.10",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "7.2.9",
                  "versionStartIncluding": "4.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "4.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: sd_zbc: Reject disks with too many zones\n\nsd_zbc_read_zones() computes the number of zones with 64-bit arithmetic and\nstores the result in the unsigned int nr_zones field of struct\nzoned_disk_info, silently truncating counts that exceed 32 bits. The\ntruncated count is later used to size per-zone resources, while the device\nmay still report more zones than fit.\n\nMoreover, sd_zbc_report_zones() counts the reported zones with a signed int\nzone_idx, which overflows past INT_MAX. Reject devices reporting more than\nINT_MAX zones at scan time; such a device is not realistic for any medium\nthat exists today, and accepting it produces inconsistent zone bookkeeping."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:23:03.375Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d8791ae55d85dfaeafa20ea48365482a0cc5a107"
        },
        {
          "url": "https://git.kernel.org/stable/c/0af16d8be3ec7ff28bb56a0da79c9aed66ac2c3b"
        },
        {
          "url": "https://git.kernel.org/stable/c/3ddf8383b54456f19fd73d3cebed81bd250c7388"
        },
        {
          "url": "https://git.kernel.org/stable/c/b6ec0f79745967c751c85df373062c8d15e45fc4"
        }
      ],
      "title": "scsi: sd_zbc: Reject disks with too many zones",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98634",
    "datePublished": "2026-10-18T15:20:03.198Z",
    "dateReserved": "2026-09-25T10:25:14.361Z",
    "dateUpdated": "2026-10-19T09:23:03.375Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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