SB2026072117 - Improper access control in Linux kernel f2fs

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Main Vulnerability Database SB2026072117

SB2026072117 - Improper access control in Linux kernel f2fs

Published: July 21, 2026

Security Bulletin ID SB2026072117
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

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-2026-63817)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper access control in f2fs_iget() meta inode handling when processing a corrupted directory entry with an inode number equal to max_nid while compress_cache is disabled. A local user can create a corrupted directory entry to cause a denial of service.

Only F2FS mounts with compression support present and the compress_cache mount option disabled are affected by this behavior.


Remediation

Install update from vendor's website.

References