Back
CVE-2025-40285smb/server: fix possible refcount leak in smb2_sess_setup()
- 7.5HighCVSS base score
- 0.44%Exploitation in 30 daysEPSS · top 61% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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().
Timeline
ID reserved
By Linux
- 8 months later
· 8 months later
Published
- 8 months later
· 8 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Deferred | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.44% · top 61% of all CVEs (14 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
- affected 37a0e2b362b3150317fb6e2139de67b1e29ae5ff – < 6fc935f798d44a8eb8a5e6659198399fbf57b981
- affected 450a844c045ff0895d41b05a1cbe8febd1acfcfd – < e671f9bb97805771380c98de944e2ceab6949188
- affected a39e31e22a535d47b14656a7d6a893c7f6cf758c – < dcc51dfe6ff26b52cac106865a172ac982d78401
- affected b95629435b84b9ecc0c765995204a4d8a913ed52 – < d37b2c81c83d6c0d5ca582f4fe73c672983f9e0d
- affected b95629435b84b9ecc0c765995204a4d8a913ed52 – < 379510a815cb2e64eb0a379cb62295d6ade65df0
- affected 2107ab40629aeabbec369cf34b8cf0f288c3eb1b
- affected 6.1.121 – < 6.1.159
- affected 6.6.67 – < 6.6.117
- affected 6.12.6 – < 6.12.59
- affected 5.15.176 – < 5.16
- affected 6.13
- unaffected < 6.13
- unaffected 6.1.159 – ≤ 6.1.*
- unaffected 6.6.117 – ≤ 6.6.*
- unaffected 6.12.59 – ≤ 6.12.*
- unaffected 6.17.9 – ≤ 6.17.*
- unaffected 6.18 – ≤ *
References
References5
- https://git.kernel.org/stable/c/6fc935f798d44a8eb8a5e6659198399fbf57b981 (opens in a new tab)
- https://git.kernel.org/stable/c/e671f9bb97805771380c98de944e2ceab6949188 (opens in a new tab)
- https://git.kernel.org/stable/c/dcc51dfe6ff26b52cac106865a172ac982d78401 (opens in a new tab)
- https://git.kernel.org/stable/c/d37b2c81c83d6c0d5ca582f4fe73c672983f9e0d (opens in a new tab)
- https://git.kernel.org/stable/c/379510a815cb2e64eb0a379cb62295d6ade65df0 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-201570 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-40285)Record last updated .