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CVE-2026-31537

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: smb: server: make use of smbdirect_socket.send_io.bcredits It turns out that our code will corrupt the stream of reassabled dat…

Published Apr 24, 2026EPSS 0.16%

Overview

CVE-2026-31537 is a medium-severity vulnerability. It was published on April 24, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

smb: server: make use of smbdirect_socket.send_io.bcredits

It turns out that our code will corrupt the stream of

reassabled data transfer messages when we trigger an

immendiate (empty) send.

In order to fix this we'll have a single 'batch' credit per

connection. And code getting that credit is free to use

as much messages until remaining_length reaches 0, then

the batch credit it given back and the next logical send can

happen.

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/34abd408c8ba24d7c97bd02ba874d8c714f49db1Refgit.kernel.org/stable/c/5ef18a2e66f2f33fdac64437bddfb9fe6389fdc7Refgit.kernel.org/stable/c/79242e7b6bc63efec28b7c235bc320806afce6c0

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31537?

CVE-2026-31537 is a medium-severity vulnerability. It was published on April 24, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-31537?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-31537?

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-2026-31537?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31537 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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