CVE-2025-40285

CVE-2025-40285 is a security vulnerability that is still awaiting full analysis and scoring. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Description

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().

Frequently asked questions

What is CVE-2025-40285?
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().
Is CVE-2025-40285 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-40285?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-40285 have an EU (EUVD) identifier?
Yes. CVE-2025-40285 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201570.
When was CVE-2025-40285 published?
CVE-2025-40285 was published on 2025-12-06 and last updated on 2026-06-17.

References