SB20260727120 - Out-of-bounds read in Linux kernel smb client

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Main Vulnerability Database SB20260727120

SB20260727120 - Out-of-bounds read in Linux kernel smb client

Published: July 27, 2026

Security Bulletin ID SB20260727120
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Information disclosure

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-2026-64448)

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

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in smb2_check_message() and subsequent SMB client protocol decoders when processing crafted SMB2 responses with a data area. A remote attacker can send a specially crafted SMB server response to disclose sensitive information.

The issue is reachable during NEGOTIATE and SESSION_SETUP before the session is established, including through the SPNEGO/negTokenInit and NTLMSSP challenge decoders when mounting against a non-conforming server.


Remediation

Install update from vendor's website.

References