---
id: CVE-2026-88838
title: A flaw was found in BusyBox's mount utility
summary: >-
  A flaw was found in BusyBox's mount utility. A non-root user can bypass mount
  security restrictions set in /etc/fstab by specifying clearing-mask options on
  the command line. These options pass the non-root flag filter and are merged
  wit…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-693
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T17:17:48.340'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88838'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-88838'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2531352'
    label: secalert@redhat.com
tags:
  - nvd
ingestedAt: '2026-10-13T17:38:53.201Z'
---

## Overview

A flaw was found in BusyBox's mount utility. A non-root user can bypass mount security restrictions set in /etc/fstab by specifying clearing-mask options on the command line. These options pass the non-root flag filter and are merged with fstab options as strings; when the combined options are re-parsed, clearing options can override nosuid, nodev, and noexec protections the administrator intended to enforce.

## Remediation

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