CVE-2026-31539 Details
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.
A vulnerability in the Linux kernel's SMBDirect implementation has been addressed. The issue arose from a race condition in managing receive credits, which are crucial for the proper functioning of the SMBDirect protocol. The original logic counted posted receive I/O messages and granted credits, but this approach was flawed. There was a potential window where credits could be incorrectly granted after a peer had already consumed them, leading to a mismatch in credit availability. To resolve this, a dedicated counter for available credits has been introduced, ensuring accurate tracking by incrementing the count when new receive buffers are posted and decrementing it when credits are granted to the peer.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been fixed. The specific commit addressing this issue is available in the Linux kernel stable tree.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/6e3c5052f9686192e178806e017b7377155f4bab | kernel.org | Patch |
| https://git.kernel.org/stable/c/e811e60e1cc79923c4388146eb1fa26a7482731e | kernel.org | Patch |
| https://git.kernel.org/stable/c/f99996870222b598914a1f49d7375dc23752c237 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.18, < 6.18.11 >= 6.19, < 6.19.1 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| Apr 28, 2026 | Initial Analysis | [email protected] |
| Apr 27, 2026 | CVE Modified | kernel.org |
| Apr 24, 2026 | New CVE Received | kernel.org |