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Vulnerability record · CVE-2026-31409 · published 6 April 2026

CVE-2026-31409: Linux kernel vulnerability

Linux · Linux Kernel

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.

8.8 CVSS 3.1 High EPSS 0.66% · top 50.3%
8.8CVSS 3.1 base score
0.66%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
24 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/282343cf8a4a5a3603b1cb0e17a7083e4a593b03 Patch
https://git.kernel.org/stable/c/6260fc85ed1298a71d24a75d01f8b2e56d489a60 Patch
https://git.kernel.org/stable/c/6ebef4a220a1ebe345de899ebb9ae394206fe921 Patch
https://git.kernel.org/stable/c/7e8b270813079c785696bce8802a3f920665c88c
https://git.kernel.org/stable/c/89afe5e2dbea6e9d8e5f11324149d06fa3a4efca Patch
https://git.kernel.org/stable/c/9feb2d1bf86d9e5e66b8565f37f8d3a7d281a772 Patch
https://git.kernel.org/stable/c/d073870dab8f6dadced81d13d273ff0b21cb7f4e Patch

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Source: NIST National Vulnerability Database (record CVE-2026-31409), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.