Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: defer connection scavenging while session locks are busy The expiration worker holds conn_list_lock for reading while checking for authenticated sessions. Without this change, the check can wait for conn->session_lock or sessions_table_lock. In destroy_previous_session(), the status updates after ksmbd_conn_wait_idle_sess() run with both session locks held for writing. Both the KSMBD_SESS_GOOD error path and the KSMBD_SESS_NEED_SETUP success path call ksmbd_all_conn_set_status(), which takes conn_list_lock for reading. A writer queued on conn_list_lock can block these new read acquisitions. The worker then waits for a session lock held by destroy_previous_session(), which waits behind the writer. The writer cannot proceed until the worker releases conn_list_lock. Try both session locks instead of waiting in the scavenging check. Keep the connection when either lock is busy and let the periodic worker retry later.
References
- https://git.kernel.org/stable/c/4e4e8b38994a0b0fc23f00ca6698b469a41abe70
- https://git.kernel.org/stable/c/b4bae7af1154089be87c7475218264fcbfd16d10
FAQ
What is CVE-2026-99276?
CVE-2026-99276 is a documented vulnerability. In the Linux kernel, the following vulnerability has been resolved: ksmbd: defer connection scavenging while session locks are busy The expiration worker holds conn_list_lock for reading while check...
How severe is CVE-2026-99276?
CVSS scoring is not yet available for CVE-2026-99276. Check NVD for updates.
Is there a patch for CVE-2026-99276?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.