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CVE-2026-31717

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate owner of durable handle on reconnect Currently, ksmbd does not verify if the user attempting to reconnect to a…

Published May 1, 2026EPSS 0.60%

Overview

CVE-2026-31717 is a high-severity vulnerability. It was published on May 1, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: validate owner of durable handle on reconnect

Currently, ksmbd does not verify if the user attempting to reconnect

to a durable handle is the same user who originally opened the file.

This allows any authenticated user to hijack an orphaned durable handle

by predicting or brute-forcing the persistent ID.

According to MS-SMB2, the server MUST verify that the SecurityContext

of the reconnect request matches the SecurityContext associated with

the existing open.

Add a durable_owner structure to ksmbd_file to store the original opener's

UID, GID, and account name. and catpure the owner information when a file

handle becomes orphaned. and implementing ksmbd_vfs_compare_durable_owner()

to validate the identity of the requester during SMB2_CREATE (DHnC).

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/00ce8d6789dae72d042a4522264964c72891ca37Refgit.kernel.org/stable/c/49110a8ce654bbe56bef7c5e44cce31f4b102b8aRefgit.kernel.org/stable/c/712cdf917e77a6444ce3836874829d770db20ee6Refgit.kernel.org/stable/c/c7f0f0d01c88bdcb8b1694d7d321670013f7ed7dRefgit.kernel.org/stable/c/c908c853f304a4969b5aa10eba0b50350cc65b80

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31717?

CVE-2026-31717 is a high-severity vulnerability. It was published on May 1, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-31717?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-31717?

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-2026-31717?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31717 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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