CVE-2026-98175: Linux

High severity, CVSS 7.5. EPSS: 0.3% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: smb: client: cancel reconnect work in clean_demultiplex_info() clean_demultiplex_info() cancels server->echo delayed work but not server->reconnect, which can cause a use-after-free when the demultiplex thread exits while a reconnect work is still queued: cifs_demultiplex_thread() cifs_readv_from_socket() cifs_reconnect() __cifs_reconnect() cifs_queue_server_reconn() mod_delayed_work(cifsiod_wq, &server->reconnect, 0) clean_demultiplex_info() cancel_delayed_work_sync(&server->echo) // echo canceled // reconnect NOT canceled kfree_sensitive(server) // server freed ...later, on cifsiod_wq: smb2_reconnect_server() server->srv_count // UAF read of freed server Fix this by canceling server->reconnect delayed work in clean_demultiplex_info() before the server is freed, the same way cifs_put_tcp_session() already does.

Affected products

• Linux Linux: from 3.10.107, before 3.11 (fixed in 3.11); from 3.12.70, before 3.13 (fixed in 3.13); from 3.16.42, before 3.17 (fixed in 3.17); from 3.18.47, before 3.19 (fixed in 3.19); from 4.1.38, before 4.2 (fixed in 4.2); from 4.4.40, before 4.5 (fixed in 4.5); …

Published 2026-10-06. Last modified 2026-10-07.