CVE-2026-64393 Details
Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: run set info with opener credentials SMB2 SET_INFO handlers call path-based VFS helpers after checking the access mask granted to the SMB handle. Those helpers perform their owner, inode permission and LSM checks using the current ksmbd worker credentials. Run the complete SET_INFO dispatch with the credentials captured when the handle was opened. This also removes the separate security information credential setup and keeps all SET_INFO classes under one credential scope. Direct override_creds() is used because it can nest with the request credential overrides already used by rename and link helpers.
A vulnerability in the Linux kernel's ksmbd component affects the handling of SMB2 SET_INFO requests. This issue arises because the SET_INFO handlers use the current worker credentials to perform permission checks, rather than the credentials of the user who opened the SMB handle. As a result, the permission checks may not accurately reflect the user's rights, potentially leading to unauthorized actions. The vulnerability is present in the Linux kernel stable tree.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been addressed. Instructions for downloading the patched version are available on the Linux Kernel Archives.
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/0ce682867fd506f61f40c76bde7e4205bde34e87 | kernel.org | Patch |
| https://git.kernel.org/stable/c/20ee516a62989a8d505ee432f9e59525ea23984e | kernel.org | Patch |
| https://git.kernel.org/stable/c/5cbabf3a71575cd31bc7785d92d4ab42338a654b | kernel.org | Patch |
| https://git.kernel.org/stable/c/8cc9ec711f5255167247a9ab6a7179b787426ed7 | kernel.org | Patch |
| https://git.kernel.org/stable/c/b35afd5cf8fab236ef21117e42ee45691d4ffa7b | kernel.org | Patch |
| https://git.kernel.org/stable/c/b383bcad3d2fe634b26efbce53e22bbb5753a520 | 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, < 6.1.178 >= 6.2, < 6.6.145 >= 6.7, < 6.12.96 >= 6.13, < 6.18.39 >= 6.19, < 7.1.4 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 4, 2026 | Initial Analysis | [email protected] |
| Aug 17, 2026 | CVE Modified | kernel.org |
| Jul 27, 2026 | CVE Modified | kernel.org |
| Jul 25, 2026 | New CVE Received | kernel.org |