SB20260424252 - Memory leak in Linux kernel smb server

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Main Vulnerability Database SB20260424252

SB20260424252 - Memory leak in Linux kernel smb server

Published: April 24, 2026

Security Bulletin ID SB20260424252
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Partial DoS

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Memory leak (CVE-ID: CVE-2026-31477)

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/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 a memory leak in smb2_lock() when handling error paths after list_del() detaches smb_lock from lock_list. A local user can trigger unexpected error conditions in lock and unlock processing to cause a denial of service.

The issue affects both the non-UNLOCK path on unexpected vfs_lock_file() errors and the UNLOCK path when vfs_lock_file() returns -ENOENT.


Remediation

Install update from vendor's website.

References