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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-31476 Detail

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().


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/1d1888b4a7aec518b707f6eca0bf08992c0e8da3 kernel.org
https://git.kernel.org/stable/c/6fafc4c4238e538969f1375f9ecdc6587c53f1cc kernel.org
https://git.kernel.org/stable/c/9bbb19d21ded7d78645506f20d8c44895e3d0fb9 kernel.org
https://git.kernel.org/stable/c/a897064a457056acb976e20e3007cdf553de340f kernel.org
https://git.kernel.org/stable/c/e0e5edc81b241c70355217de7e120c97c3429deb kernel.org
https://git.kernel.org/stable/c/f5300690c23c5ac860499bb37dbc09cf43fd62e6 kernel.org

Weakness Enumeration

CWE-ID CWE Name Source

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-31476
NVD Published Date:
04/22/2026
NVD Last Modified:
04/23/2026
Source:
kernel.org