---
id: CVE-2026-98634
title: 'scsi: sd_zbc: Reject disks with too many zones'
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_zon…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 89d9475610771b5e5fe1879075f0fc9ba6e3755f <
    d8791ae55d85dfaeafa20ea48365482a0cc5a107
  - >-
    Linux >= 89d9475610771b5e5fe1879075f0fc9ba6e3755f <
    0af16d8be3ec7ff28bb56a0da79c9aed66ac2c3b
  - >-
    Linux >= 89d9475610771b5e5fe1879075f0fc9ba6e3755f <
    3ddf8383b54456f19fd73d3cebed81bd250c7388
  - >-
    Linux >= 89d9475610771b5e5fe1879075f0fc9ba6e3755f <
    b6ec0f79745967c751c85df373062c8d15e45fc4
  - Linux 4.10
published: '2026-10-18'
updated: '2026-10-18'
sourceUpdated: '2026-10-18T15:20:03.198Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98634'
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'
tags:
  - cve.org
ingestedAt: '2026-10-18T15:45:12.233Z'
---

## Overview

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.

## Affected

- `Linux >= 89d9475610771b5e5fe1879075f0fc9ba6e3755f < d8791ae55d85dfaeafa20ea48365482a0cc5a107`
- `Linux >= 89d9475610771b5e5fe1879075f0fc9ba6e3755f < 0af16d8be3ec7ff28bb56a0da79c9aed66ac2c3b`
- `Linux >= 89d9475610771b5e5fe1879075f0fc9ba6e3755f < 3ddf8383b54456f19fd73d3cebed81bd250c7388`
- `Linux >= 89d9475610771b5e5fe1879075f0fc9ba6e3755f < b6ec0f79745967c751c85df373062c8d15e45fc4`
- `Linux 4.10`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.