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.

Metrics

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00209.

Key SSVC decision points have not yet been added.

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Fixes

Solution

No solution given by the vendor.

Workaround

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References
Link Providers
https://git.kernel.org/stable/c/180380272f116dbd2b0354c5c7872e112e519149 cve-icon cve-icon
https://git.kernel.org/stable/c/2e5103e11a17c274715dd56cf185eeedccf686b8 cve-icon cve-icon
https://git.kernel.org/stable/c/7ab9ceedd860216fb97f2d8574cbe58b8906f42a cve-icon cve-icon
https://git.kernel.org/stable/c/c65eae6f61d1778ff7a82e4aae4080e26f486af1 cve-icon cve-icon
https://git.kernel.org/stable/c/e3f6a779433d13aafb5edab59e4f9313051e8a52 cve-icon cve-icon
History

Tue, 06 Oct 2026 16:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Tue, 06 Oct 2026 09:00:00 +0000

Type Values Removed Values Added
Description 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.
Title smb: client: cancel reconnect work in clean_demultiplex_info()
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-10-06T08:44:19.155Z

Reserved: 2026-09-25T10:25:14.322Z

Link: CVE-2026-98175

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-06T09:17:59.477

Modified: 2026-10-06T09:17:59.477

Link: CVE-2026-98175

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-06T16:00:03Z

Weaknesses