CVE-2026-98634

Status: ReceivedUnscored—

Severity—Unscored

Exploitation probability0.17 %higher than 6% of CVEs

Active exploitationNonot in the CISA catalog

Public exploitNot knownno public code found

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.

CVSS

NVD hasn't assigned a CVSS score to this CVE (common since the April 2026 policy change).

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.17 %
Percentile among all scored CVEs: 6
Score date: 10/20/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Linux — Linux Kernel^AI

References

Show 4 references

Raw JSON (NVD)

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{
  "id": "CVE-2026-98634",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "89d9475610771b5e5fe1879075f0fc9ba6e3755f",
              "lessThan": "d8791ae55d85dfaeafa20ea48365482a0cc5a107",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "89d9475610771b5e5fe1879075f0fc9ba6e3755f",
              "lessThan": "0af16d8be3ec7ff28bb56a0da79c9aed66ac2c3b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "89d9475610771b5e5fe1879075f0fc9ba6e3755f",
              "lessThan": "3ddf8383b54456f19fd73d3cebed81bd250c7388",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "89d9475610771b5e5fe1879075f0fc9ba6e3755f",
              "lessThan": "b6ec0f79745967c751c85df373062c8d15e45fc4",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/scsi/sd_zbc.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.10"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.10",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.55",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.9",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/scsi/sd_zbc.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-10-18T16:17:16.507",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0af16d8be3ec7ff28bb56a0da79c9aed66ac2c3b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/3ddf8383b54456f19fd73d3cebed81bd250c7388",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b6ec0f79745967c751c85df373062c8d15e45fc4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d8791ae55d85dfaeafa20ea48365482a0cc5a107",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "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."
    }
  ],
  "lastModified": "2026-10-19T10:19:27.657",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}