SB2026100807 - Use-after-free in Linux kernel smb client

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Main Vulnerability Database SB2026100807

SB2026100807 - Use-after-free in Linux kernel smb client

Published: October 8, 2026

Security Bulletin ID SB2026100807
CSH Severity
High
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: CVE-2026-98261)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to compromise system confidentiality, integrity, and availability.

The vulnerability exists due to use-after-free in cifs_chan_skip_or_disable() when handling a secondary channel that is no longer supported by the server. A remote attacker can trigger the release of a channel reference followed by access to freed server objects to compromise system confidentiality, integrity, and availability.

Both the secondary channel and its primary server can be freed if cifs_put_tcp_session() drops their last references.


Remediation

Install update from vendor's website.

References