CVE-2025-40285

smb/server: fix possible refcount leak in smb2_sess_setup()

CVE-2025-40285 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-40285, released December 6, 2025. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.5

Moderate

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0044

38th percentile

In the Linux kernel, the following vulnerability has been resolved: smb/server: fix possible refcount leak in smb2_sess_setup() Reference count of ksmbd_session will leak when session need reconnect. Fix this by adding the missing ksmbd_user_session_put().

Where it's fixed

Product	Fixed in	Fix	Released
Linux
linux · Debian 12.15 (bookworm)	6.1.159-1	DEBIAN-CVE-2025-40285	Dec 6, 2025
linux · Debian 13.5 (trixie)	6.12.63-1	DEBIAN-CVE-2025-40285	Dec 6, 2025
linux · Debian 14	6.17.9-1	DEBIAN-CVE-2025-40285	Dec 6, 2025

Details

Published
December 6, 2025
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-40285

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