SB20260625135 - Out-of-bounds read in Linux kernel ocfs2

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Main Vulnerability Database SB20260625135

SB20260625135 - Out-of-bounds read in Linux kernel ocfs2

Published: June 25, 2026

Security Bulletin ID SB20260625135
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) Out-of-bounds read (CVE-ID: CVE-2026-53040)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 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/E:U/U:Clear


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

The vulnerability exists due to an out-of-bounds read in the ocfs2 freefrag scan logic in fs/ocfs2/ioctl.c when processing a crafted filesystem through OCFS2_IOC_INFO with OCFS2_INFO_FL_NON_COHERENT. A local user can supply a crafted filesystem and issue the ioctl request to cause a denial of service.

The issue occurs in the non-coherent scan path, which reads raw group descriptor blocks without the validation performed by the coherent path.


Remediation

Install update from vendor's website.

References