SB20260815341 - Improper access control in Linux kernel fs

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Main Vulnerability Database SB20260815341

SB20260815341 - Improper access control in Linux kernel fs

Published: August 15, 2026

Security Bulletin ID SB20260815341
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper access control (CVE-ID: CVE-2026-72379)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a local user to create a temporary file with invalid ownership.

The vulnerability exists due to improper access control in vfs_tmpfile() when creating an O_TMPFILE on an idmapped mount that does not map the caller's fsuid or fsgid. A local user can create a temporary file on such a mount to create a temporary file with invalid ownership.

The issue affects filesystems that support idmapped mounts and implement tmpfile handling, as well as overlayfs through upper-layer tmpfile creation.


Remediation

Install update from vendor's website.

References