CVE-2026-99276
In the Linux kernel, the following vulnerability has been resolved: ksmbd: defer connection scavenging while session locks are busy The expiration worker holds…
Impact
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.
Affected products · Linux
| Product | Affected versions |
|---|---|
| Linux | from 7.2.8 before 7.3 from d7fd1f98607f2cd358e583f9548bdf0173090a86 before b4bae7af1154089be87c7475218264fcbfd16d10 Versions 7.3, patch: 0, patch: 7.4-rc1, c99ea7855124ca1428a1e59c2b4590aaef34eacf |