CVE-2026-31409ksmbd: unset conn->binding on failed binding request
- 8.8HighCVSS base score
- 0.46%Exploitation in 30 daysEPSS · top 59% 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: ksmbd: unset conn->binding on failed binding request When a multichannel SMB2_SESSION_SETUP request with SMB2_SESSION_REQ_FLAG_BINDING fails ksmbd sets conn->binding = true but never clears it on the error path. This leaves the connection in a binding state where all subsequent ksmbd_session_lookup_all() calls fall back to the global sessions table. This fix it by clearing conn->binding = false in the error path.
Timeline
ID reserved
By Linux
- 28 days later
· 28 days later
Published
- 4 months later
· 4 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 | High8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.46% · top 59% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.
Affected products
- affected f5a544e3bab78142207e0242d22442db85ba1eff – < 7e8b270813079c785696bce8802a3f920665c88c
- affected f5a544e3bab78142207e0242d22442db85ba1eff – < d073870dab8f6dadced81d13d273ff0b21cb7f4e
- affected f5a544e3bab78142207e0242d22442db85ba1eff – < 6ebef4a220a1ebe345de899ebb9ae394206fe921
- affected f5a544e3bab78142207e0242d22442db85ba1eff – < 89afe5e2dbea6e9d8e5f11324149d06fa3a4efca
- affected f5a544e3bab78142207e0242d22442db85ba1eff – < 9feb2d1bf86d9e5e66b8565f37f8d3a7d281a772
- affected f5a544e3bab78142207e0242d22442db85ba1eff – < 6260fc85ed1298a71d24a75d01f8b2e56d489a60
- affected f5a544e3bab78142207e0242d22442db85ba1eff – < 282343cf8a4a5a3603b1cb0e17a7083e4a593b03
- affected 5.15
- unaffected < 5.15
- unaffected 5.15.209 – ≤ 5.15.*
- unaffected 6.1.167 – ≤ 6.1.*
- unaffected 6.6.130 – ≤ 6.6.*
- unaffected 6.12.78 – ≤ 6.12.*
- unaffected 6.18.20 – ≤ 6.18.*
- unaffected 6.19.10 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References7
- https://git.kernel.org/stable/c/7e8b270813079c785696bce8802a3f920665c88c (opens in a new tab)
- https://git.kernel.org/stable/c/d073870dab8f6dadced81d13d273ff0b21cb7f4e (opens in a new tab)
- https://git.kernel.org/stable/c/6ebef4a220a1ebe345de899ebb9ae394206fe921 (opens in a new tab)
- https://git.kernel.org/stable/c/89afe5e2dbea6e9d8e5f11324149d06fa3a4efca (opens in a new tab)
- https://git.kernel.org/stable/c/9feb2d1bf86d9e5e66b8565f37f8d3a7d281a772 (opens in a new tab)
- https://git.kernel.org/stable/c/6260fc85ed1298a71d24a75d01f8b2e56d489a60 (opens in a new tab)
- https://git.kernel.org/stable/c/282343cf8a4a5a3603b1cb0e17a7083e4a593b03 (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-2026-19195 (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-2026-31409)Record last updated .