SB20260812190 - Out-of-bounds read in Linux kernel smb client

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Main Vulnerability Database SB20260812190

SB20260812190 - Out-of-bounds read in Linux kernel smb client

Published: August 12, 2026

Security Bulletin ID SB20260812190
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) Out-of-bounds read (CVE-ID: CVE-2026-68343)

CWE-ID: CWE-125 - Out-of-bounds read

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 an out-of-bounds read.

The vulnerability exists due to an out-of-bounds read in parse_dfs_referrals() in the SMB client DFS referral parser when processing a malformed DFS referral response with an oversized PathConsumed value. A remote attacker can send a specially crafted DFS referral response to cause an out-of-bounds read.

The issue occurs when PathConsumed is larger than the search name length used for later DFS path parsing.


Remediation

Install update from vendor's website.

References