SB2026102223 - Missing Release of File Descriptor or Handle after Effective Lifetime in Linux kernel smb client

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Main Vulnerability Database SB2026102223

SB2026102223 - Missing Release of File Descriptor or Handle after Effective Lifetime in Linux kernel smb client

Published: October 22, 2026

Security Bulletin ID SB2026102223
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Partial DoS

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Missing Release of File Descriptor or Handle after Effective Lifetime (CVE-ID: CVE-2026-98453)

CWE-ID: CWE-775 - Missing Release of File Descriptor or Handle after Effective Lifetime

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause resource leakage that may lead to a denial of service.

The vulnerability exists due to missing release of a remote handle in the Linux kernel SMB client's SMB2_open() function when parsing malformed create contexts in a successful CREATE response. A remote attacker can return a specially crafted response from an SMB server to leave a server-side handle open and the num_remote_opens count elevated, potentially causing resource exhaustion through repeated failures.


Remediation

Install update from vendor's website.

References