CVE-2026-31537 Details
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.
A vulnerability in the Linux kernel's SMB server implementation can disrupt the proper flow of reassembled data transfer messages. This issue arises when an immediate, empty send is triggered, leading to corruption in the data stream. The vulnerability is present in the stable Linux kernel versions 6.18.x. The root cause lies in the handling of send credits, which are not properly managed during data transmission, particularly when an empty send is initiated. As a result, the server can mistakenly overwrite or lose important data transfer information, causing disruptions in communication.
Users can upgrade to the latest stable version of the Linux kernel, where this vulnerability has been addressed. Instructions for downloading the patched version can be found on the official Linux kernel website.
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/34abd408c8ba24d7c97bd02ba874d8c714f49db1 | kernel.org | Patch |
| https://git.kernel.org/stable/c/5ef18a2e66f2f33fdac64437bddfb9fe6389fdc7 | kernel.org | Patch |
| https://git.kernel.org/stable/c/79242e7b6bc63efec28b7c235bc320806afce6c0 | 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 | >= 5.15, < 6.18.11 >= 6.19, < 6.19.1 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| Apr 28, 2026 | Initial Analysis | [email protected] |
| Apr 24, 2026 | New CVE Received | kernel.org |