SB2026102444 - Unchecked Return Value in Linux kernel isofs

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Main Vulnerability Database SB2026102444

SB2026102444 - Unchecked Return Value in Linux kernel isofs

Published: October 24, 2026

Security Bulletin ID SB2026102444
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) Unchecked Return Value (CVE-ID: CVE-2026-98879)

CWE-ID: CWE-252 - Unchecked Return Value

CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local privileged user to cause a denial of service by triggering a kernel assertion failure.

The vulnerability exists due to an unchecked return value from sb_set_blocksize() in isofs_fill_super() when mounting an ISO filesystem with a block size greater than PAGE_SIZE. A local privileged user can cause such a filesystem to be mounted to trigger the BUG_ON(offset >= folio_size(folio)) assertion in folio_set_bh() during the first __bread_gfp() call, causing a denial of service.


Remediation

Install update from vendor's website.

References