SB2026072143 - Out-of-bounds read in Linux kernel smb server

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Main Vulnerability Database SB2026072143

SB2026072143 - Out-of-bounds read in Linux kernel smb server

Published: July 21, 2026

Security Bulletin ID SB2026072143
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-2026-53390)

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 smb_check_perm_dacl() when processing a crafted security descriptor during an SMB2_CREATE access check. A remote user can store a crafted ACE via SMB2_SET_INFO to disclose sensitive information.

Exploitation is reachable on a share that uses ACL xattrs, and the malformed descriptor is processed on a subsequent access check.


Remediation

Install update from vendor's website.

References