---
id: CVE-2026-93828
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  exfat: fix handling of damaged volume in exfat_create_upcase_table()

  When the size of the upcase table is set to zero in the dentry for any
  reason(e.g
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  exfat: fix handling of damaged volume in exfat_create_upcase_table()

  When the size of the upcase table is set to zero in the dentry for any
  reason(e.g. corrupted media…
severity: medium
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    60ace93811609e4dd883e9de5fb4462ed834160a
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    2cc0b612343638057ef321ce735201a7c2f52f25
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    20dd3185d13865214ff25b0bf7b931e8d73be1ac
  - Linux < 6.12.111
  - Linux < 6.18.53
  - Linux (all versions)
published: '2026-09-24'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T13:17:23.633'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93828'
references:
  - url: 'https://git.kernel.org/stable/c/20dd3185d13865214ff25b0bf7b931e8d73be1ac'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2cc0b612343638057ef321ce735201a7c2f52f25'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/60ace93811609e4dd883e9de5fb4462ed834160a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93828.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-93828'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2540454'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-93828'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93828'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93828.mbox
  - url: 'https://git.kernel.org/stable/c/29723256fccf46e55c2a44bd6b8345bef7ba079b'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ingestedAt: '2026-09-24T16:47:15.889Z'
epss: 0.00168
epssPercentile: 0.06162
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-835
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

exfat: fix handling of damaged volume in exfat_create_upcase_table()

When the size of the upcase table is set to zero in the dentry for any
reason(e.g. corrupted media or misbehaving device), an integer overflow
causes the module to loop indefinitely.

If the size of the upcase table is read zero, do not attempt to load the
table. Instead, fallback to loading the default upcase table. If the
size of the upcase table is zero or no upcase table is found, raise
exfat_fs_error() to mark the volume read-only.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93828.json)