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Vulnerability record · CVE-2026-31476 · published 22 April 2026

CVE-2026-31476: Linux kernel vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: ksmbd: do not expire session on binding failure When a multichannel session binding request fails (e.g. wrong password), the error path unconditionally sets sess->state = SMB2_SESSION_EXPIRED. However, during binding, sess points to the target session looked up via ksmbd_session_lookup_slowpath() -- which belongs to another connection's user. This allows a remote attacker to invalidate any active session by simply sending a binding request with a wrong password (DoS). Fix this by skipping session expiration when the failed request was a binding attempt, since the session does not belong to the current connection. The reference taken by ksmbd_session_lookup_slowpath() is still correctly released via ksmbd_user_session_put().

8.2 CVSS 3.1 High EPSS 0.71% · top 48.2%
8.2CVSS 3.1 base score
0.71%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
17 Jun 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: do not expire session on binding failure When a multichannel session binding request fails (e.g. wrong password), the error path unconditionally sets sess->state = SMB2_SESSION_EXPIRED. However, during binding, sess points to the target session looked up via ksmbd_session_lookup_slowpath() -- which belongs to another connection's user. This allows a remote attacker to invalidate any active session by simply sending a binding request with a wrong password (DoS). Fix this by skipping session expiration when the failed request was a binding attempt, since the session does not belong to the current connection. The reference taken by ksmbd_session_lookup_slowpath() is still correctly released via ksmbd_user_session_put().

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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/1d1888b4a7aec518b707f6eca0bf08992c0e8da3 Patch
https://git.kernel.org/stable/c/4642ea35c03cf3d3558c009df4757cdb7af3f82d
https://git.kernel.org/stable/c/6fafc4c4238e538969f1375f9ecdc6587c53f1cc Patch
https://git.kernel.org/stable/c/9bbb19d21ded7d78645506f20d8c44895e3d0fb9 Patch
https://git.kernel.org/stable/c/a897064a457056acb976e20e3007cdf553de340f Patch
https://git.kernel.org/stable/c/e0e5edc81b241c70355217de7e120c97c3429deb Patch
https://git.kernel.org/stable/c/f5300690c23c5ac860499bb37dbc09cf43fd62e6 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-31476), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.