SB2026040169 - Local information disclosure in util-linux mount(8)

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Main Vulnerability Database SB2026040169

SB2026040169 - Local information disclosure in util-linux mount(8)

Published: April 1, 2026

Security Bulletin ID SB2026040169
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Race condition (CVE-ID: CVE-2026-27456)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to a race condition in the SUID binary /usr/bin/mount from util-linux. A local user can mount any root-owned file or block device that contains a valid filesystem, gaining full read access to its contents.

The mounted filesystem has MS_SECURE flags applied (nosuid, nodev, noexec), which prevents execution of SUID binaries but does not restrict reading data.


Remediation

Install update from vendor's website.

References