CVE-2026-31535 Details
Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: make use of 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 SMB client has been addressed. The issue arose from a race condition in the management of received credits, which are used to control the flow of data. The problem occurred because a credit could be consumed by the peer before the receiving hardware had processed it, creating a window where credits were granted but not actually available. This vulnerability affected the Linux kernel stable tree, specifically versions 6.18.x. The flaw has been fixed by implementing a dedicated counter for available credits, which is updated when new receive buffers are posted and when credits are granted to the peer.
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/9911b1ed187a770a43950bf51f340ad4b7beecba | kernel.org | Patch |
| https://git.kernel.org/stable/c/be8845ad5d6558703d20567d8702155598325db8 | kernel.org | Patch |
| https://git.kernel.org/stable/c/f664e6e8a81103cb45c8802a9bc7499e0902c458 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-367 | Time-of-check Time-of-use (TOCTOU) Race Condition | [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
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 |