SB2026072112 - Improper control of a resource through its lifetime in Linux kernel f2fs

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Main Vulnerability Database SB2026072112

SB2026072112 - Improper control of a resource through its lifetime in Linux kernel f2fs

Published: July 21, 2026

Security Bulletin ID SB2026072112
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 control of a resource through its lifetime (CVE-ID: CVE-2026-63812)

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

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 state management in __destroy_extent_node() and the f2fs extent cache when handling extent node destruction and concurrent writeback. A local user can trigger inode eviction or writeback activity to cause a kernel sanity check failure and filesystem inconsistency.

The issue can leave the cached largest extent stale after the FI_NO_EXTENT flag is set, and concurrency with writeback is involved in the affected path.


Remediation

Install update from vendor's website.

References