SB2026092882 - Race condition in Linux kernel smb server

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-98115)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

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

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

The vulnerability exists due to a race condition in the ksmbd session teardown logic when coordinating concurrent session teardown and request cancellation. A remote user can issue SMB requests that trigger session logoff and cancellation processing to compromise confidentiality, integrity, and availability.

The issue affects SMB3 multichannel sessions, in which requests for a session can run across multiple connections.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/a7e6df0bb92642bee4431b2b85c69ada1e463b21
• https://git.kernel.org/stable/c/d12168084c8c1b6d883c8eca5853929ac5136a9e