---
id: CVE-2023-31085
title: An issue was discovered in drivers/mtd/ubi/cdev.c in the Linux kernel 6.2
summary: >-
  An issue was discovered in drivers/mtd/ubi/cdev.c in the Linux kernel 6.2.
  There is a divide-by-zero error in do_div(sz,mtd->erasesize), used indirectly
  by ctrl_cdev_ioctl, when mtd->erasesize is 0.
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-369
vendor: linux
product: linux_kernel
affected:
  - linux_kernel = 6.2
published: '2023-04-24'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T23:17:18.580'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-31085'
references:
  - url: >-
      https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=017c73a34a661a861712f7cc1393a123e5b2208c
    label: cve@mitre.org
  - url: >-
      https://lore.kernel.org/all/687864524.118195.1681799447034.JavaMail.zimbra%40nod.at/
    label: cve@mitre.org
  - url: 'https://security.netapp.com/advisory/ntap-20230929-0003/'
    label: cve@mitre.org
  - url: >-
      https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=017c73a34a661a861712f7cc1393a123e5b2208c
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lore.kernel.org/all/687864524.118195.1681799447034.JavaMail.zimbra%40nod.at/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20230929-0003/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-769027.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-794697.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00381
epssPercentile: 0.31877
ingestedAt: '2026-10-15T00:02:07.132Z'
---

## Overview

An issue was discovered in drivers/mtd/ubi/cdev.c in the Linux kernel 6.2. There is a divide-by-zero error in do_div(sz,mtd->erasesize), used indirectly by ctrl_cdev_ioctl, when mtd->erasesize is 0.

## Affected

- `linux_kernel = 6.2`

## Remediation

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