High 7.5Published Dec 6, 2025

CVE-2025-40285smb/server: fix possible refcount leak in smb2_sess_setup()

Updated under an hour ago (Oct 26, 2026, 2:20 PM ET)

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Exploited in the last 30 days

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().

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Deferred
Record last updated: Aug 5, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	37a0e2b362b3150317fb6e2139de67b1e29ae5ff builds before 6fc935f798d44a8eb8a5e6659198399fbf57b981; from 450a844c045ff0895d41b05a1cbe8febd1acfcfd before e671f9bb97805771380c98de944e2ceab6949188; from a39e31e22a535d47b14656a7d6a893c7f6cf758c before dcc51dfe6ff26b52cac106865a172ac982d78401; from b95629435b84b9ecc0c765995204a4d8a913ed52 before d37b2c81c83d6c0d5ca582f4fe73c672983f9e0d; from b95629435b84b9ecc0c765995204a4d8a913ed52 before 379510a815cb2e64eb0a379cb62295d6ade65df0; 2107ab40629aeabbec369cf34b8cf0f288c3eb1b; from 6.1.121 before 6.1.159; from 6.6.67 before 6.6.117; and 2 more ranges	CNA record

References

References

https://git.kernel.org/stable/c/6fc935f798d44a8eb8a5e6659198399fbf57b981
https://git.kernel.org/stable/c/e671f9bb97805771380c98de944e2ceab6949188
https://git.kernel.org/stable/c/dcc51dfe6ff26b52cac106865a172ac982d78401
https://git.kernel.org/stable/c/d37b2c81c83d6c0d5ca582f4fe73c672983f9e0d
https://git.kernel.org/stable/c/379510a815cb2e64eb0a379cb62295d6ade65df0

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.