SB20260918217 - Improper control of a resource through its lifetime in Linux kernel ext4

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Main Vulnerability Database SB20260918217

SB20260918217 - Improper control of a resource through its lifetime in Linux kernel ext4

Published: September 18, 2026

Security Bulletin ID SB20260918217
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 control of a resource through its lifetime (CVE-ID: CVE-2026-92502)

CWE-ID: CWE-664 - Improper control of a resource through its lifetime

CVSSv4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a local privileged user to cause data loss.

The vulnerability exists due to improper clearing of stale xarray tags in ext4 writeback handling when clean folios are skipped during writeback. A local privileged user can trigger writeback during a system reboot to cause data loss.

The issue occurs in ext4 data=journal mode while the superblock is being remounted read-only during reboot.


Remediation

Install update from vendor's website.

References