SB2026091961 - Race condition in Linux kernel smb server

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-90154)

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

CVSSv4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

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

The vulnerability exists due to improper connection-to-session association in ksmbd_all_conn_set_status when processing SMB session logoff or session replacement operations. A remote user can initiate a session logoff or session replacement to cause a denial of service.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0875872718b98e8530fbc634e5aa7dbd3253b80d
• https://git.kernel.org/stable/c/c50e628122aed077695669e25b842e778511a43d