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CVE-2026-31476

8.2 · HIGH

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.

Published Apr 22, 2026EPSS 0.71%

Overview

CVE-2026-31476 is a high-severity vulnerability. It was published on April 22, 2026 and has a CVSS 3.1 base score of 8.2 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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().

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/1d1888b4a7aec518b707f6eca0bf08992c0e8da3Refgit.kernel.org/stable/c/4642ea35c03cf3d3558c009df4757cdb7af3f82dRefgit.kernel.org/stable/c/6fafc4c4238e538969f1375f9ecdc6587c53f1ccRefgit.kernel.org/stable/c/9bbb19d21ded7d78645506f20d8c44895e3d0fb9Refgit.kernel.org/stable/c/a897064a457056acb976e20e3007cdf553de340fRefgit.kernel.org/stable/c/e0e5edc81b241c70355217de7e120c97c3429debRefgit.kernel.org/stable/c/f5300690c23c5ac860499bb37dbc09cf43fd62e6

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31476?

CVE-2026-31476 is a high-severity vulnerability. It was published on April 22, 2026 and has a CVSS 3.1 base score of 8.2 (HIGH).

How severe is CVE-2026-31476?

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-31476?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-31476?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31476 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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