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CVE-2026-31539

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: smb: smbdirect: introduce smbdirect_socket.recv_io.credits.available The logic off managing recv credits by counting posted rec…

Published Apr 24, 2026EPSS 0.43%

Overview

CVE-2026-31539 is a high-severity vulnerability. It was published on April 24, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, 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:

smb: smbdirect: introduce smbdirect_socket.recv_io.credits.available

The logic off managing recv credits by counting posted recv_io and

granted credits is racy.

That's because the peer might already consumed a credit,

but between receiving the incoming recv at the hardware

and processing the completion in the 'recv_done' functions

we likely have a window where we grant credits, which

don't really exist.

So we better have a decicated counter for the

available credits, which will be incremented

when we posted new recv buffers and drained when

we grant the credits to the peer.

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/6e3c5052f9686192e178806e017b7377155f4babRefgit.kernel.org/stable/c/e811e60e1cc79923c4388146eb1fa26a7482731eRefgit.kernel.org/stable/c/f99996870222b598914a1f49d7375dc23752c237

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31539?

CVE-2026-31539 is a high-severity vulnerability. It was published on April 24, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-31539?

This vulnerability has a CVSS 3.1 base score of 7.5, 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-2026-31539?

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-2026-31539?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31539 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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