SB20261007199 - Improper Validation of Specified Index, Position, or Offset in Input in Linux kernel smb client

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Main Vulnerability Database SB20261007199

SB20261007199 - Improper Validation of Specified Index, Position, or Offset in Input in Linux kernel smb client

Published: October 7, 2026

Security Bulletin ID SB20261007199
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) Improper Validation of Specified Index, Position, or Offset in Input (CVE-ID: CVE-2026-98171)

CWE-ID: CWE-1285 - Improper Validation of Specified Index, Position, or Offset in Input

CVSSv4: 0 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause acceptance of command offsets below the minimum header size.

The vulnerability exists due to insufficient command offset validation in the SMB client's receive_encrypted_standard() function when handling compound encrypted frames. A remote attacker can supply a frame with a nonzero NextCommand value smaller than MID_HEADER_SIZE(server) to cause acceptance of command offsets below the minimum header size.


Remediation

Install update from vendor's website.

References