SB20260812440 - Integer overflow in Linux kernel smb server

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Main Vulnerability Database SB20260812440

SB20260812440 - Integer overflow in Linux kernel smb server

Published: August 12, 2026

Security Bulletin ID SB20260812440
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) Integer overflow (CVE-ID: CVE-2026-68099)

CWE-ID: CWE-190 - Integer overflow

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


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

The vulnerability exists due to an integer overflow leading to out-of-bounds reads in ksmbd DACL builders when processing ACL entries. A remote attacker can send data that causes malformed ACL construction to cause a denial of service.

The issue occurs because an overflowed size value is consumed after loop termination, causing the committed NT ACL to under-report the bytes written and become malformed when re-parsed by clients or ksmbd itself.


Remediation

Install update from vendor's website.

References