SB20260812441 - Out-of-bounds read in Linux kernel smb server

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Main Vulnerability Database SB20260812441

SB20260812441 - Out-of-bounds read in Linux kernel smb server

Published: August 12, 2026

Security Bulletin ID SB20260812441
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds read (CVE-ID: CVE-2026-68100)

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

CVSSv4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in set_ntacl_dacl() when processing a crafted security descriptor during SMB2_QUERY_INFO(SecInfo=DACL). A remote user can send a crafted SMB2_SET_INFO request containing a malformed ACE and later trigger SMB2_QUERY_INFO to disclose sensitive information.

The issue affects inodes carrying a POSIX access ACL, and the malformed security descriptor is stored raw after being accepted because parse_dacl() breaks on a bad ACE instead of returning an error.


Remediation

Install update from vendor's website.

References