SB2026050941 - Out-of-bounds read in Linux kernel smb client

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Main Vulnerability Database SB2026050941

SB2026050941 - Out-of-bounds read in Linux kernel smb client

Published: May 9, 2026

Security Bulletin ID SB2026050941
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Information disclosure

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-2026-43350)

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

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in parse_dacl() when parsing ACE SIDs returned by an SMB server. A remote attacker can send a specially crafted ACE with a truncated NFS mode SID to disclose sensitive information.

The issue occurs because an ACE with only two subauthorities can still match the NFS mode SID pattern, leading to a read of sid.sub_auth[2] past the end of the ACE.


Remediation

Install update from vendor's website.

References