---
id: CVE-2023-4273
title: A flaw was found in the exFAT driver of the Linux kernel
summary: >-
  A flaw was found in the exFAT driver of the Linux kernel. The vulnerability
  exists in the implementation of the file name reconstruction function, which
  is responsible for reading file name entries from a directory index and
  merging file…
severity: medium
cvss: 6
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-121
  - CWE-787
vendor: linux
product: linux_kernel
affected:
  - linux_kernel < 6.4
  - linux_kernel = 6.5
  - fedora = 37
  - fedora = 38
  - enterprise_linux = 9.0
  - debian_linux = 11.0
  - debian_linux = 12.0
  - h300s_firmware
  - h500s_firmware
  - h700s_firmware
  - h410s_firmware
patched:
  - linux_kernel 6.4
published: '2023-08-09'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T22:17:17.240'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-4273'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2023:6583'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2023-4273'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2221609'
    label: secalert@redhat.com
  - url: >-
      https://dfir.ru/2023/08/23/cve-2023-4273-a-vulnerability-in-the-linux-exfat-driver/
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2023:6583'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/security/cve/CVE-2023-4273'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2221609'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://dfir.ru/2023/08/23/cve-2023-4273-a-vulnerability-in-the-linux-exfat-driver/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/344H6HO6SSC4KT7PDFXSDIXKMKHISSGF/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3TYLSJ2SAI7RF56ZLQ5CQWCJLVJSD73Q/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20231027-0002/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.debian.org/security/2023/dsa-5480'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.debian.org/security/2023/dsa-5492'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-794697.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-831302.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
epss: 0.00653
epssPercentile: 0.50107
ingestedAt: '2026-10-14T23:00:02.001Z'
---

## Overview

A flaw was found in the exFAT driver of the Linux kernel. The vulnerability exists in the implementation of the file name reconstruction function, which is responsible for reading file name entries from a directory index and merging file name parts belonging to one file into a single long file name. Since the file name characters are copied into a stack variable, a local privileged attacker could use this flaw to overflow the kernel stack.

## Affected

- `linux_kernel < 6.4`
- `linux_kernel = 6.5`
- `fedora = 37`
- `fedora = 38`
- `enterprise_linux = 9.0`
- `debian_linux = 11.0`
- `debian_linux = 12.0`
- `h300s_firmware`
- `h500s_firmware`
- `h700s_firmware`
- `h410s_firmware`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.4`