SB20260812438 - Out-of-bounds read in Linux kernel smb server

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Main Vulnerability Database SB20260812438

SB20260812438 - Out-of-bounds read in Linux kernel smb server

Published: August 12, 2026

Security Bulletin ID SB20260812438
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

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-2026-68097)

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

CVSSv4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to cause a denial of service.

The vulnerability exists due to an out-of-bounds read in set_ntacl_dacl() in ksmbd when processing crafted ACE data in NT ACLs. A remote user can supply an undersized ACE with a SID sub-authority count that exceeds the declared ACE size to cause a denial of service.

The out-of-bounds access occurs later during the POSIX ACL deduplication walk after the malformed ACE has been copied.


Remediation

Install update from vendor's website.

References