SB20260816313 - Improper update of reference count in Linux kernel lockd

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Main Vulnerability Database SB20260816313

SB20260816313 - Improper update of reference count in Linux kernel lockd

Published: August 16, 2026

Security Bulletin ID SB20260816313
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper update of reference count (CVE-ID: CVE-2026-72218)

CWE-ID: CWE-911 - Improper Update of Reference Count

CVSSv4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


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

The vulnerability exists due to improper reference count management in lockd nlm_lookup_file() when handling cached file lookups after nlm_do_fopen() failure. A remote user can trigger a failed file-open operation to cause a denial of service.

The issue occurs because the file reference count is incremented but not released, preventing the file from being reaped between requests.


Remediation

Install update from vendor's website.

References