CVE-2026-64392 Details
Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: use opener credentials for delete-on-close Delete-on-close can be completed by deferred or durable handle teardown, where no request work is available. Both the base-file unlink and the ADS xattr removal consequently run with the ksmbd worker credentials and can bypass filesystem permission checks. Run both operations with the credentials captured in struct file when the handle was opened. This preserves the authenticated user's fsuid, fsgid, supplementary groups and capability restrictions at final close.
A vulnerability in the Linux kernel's ksmbd component allows delete-on-close operations to bypass filesystem permission checks. This issue arises because the unlinking of base files and the removal of Alternate Data Stream (ADS) extended attributes are executed with the ksmbd worker's credentials, rather than those of the user who initiated the operation. As a result, these actions can circumvent normal permission controls. The vulnerability affects the Linux kernel stable tree.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been addressed.
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/18c59109bb6fb816d5102171666f87cf1e29901d | kernel.org | Patch |
| https://git.kernel.org/stable/c/4b7059974549d278e30fe70e2a4e421f9839817d | kernel.org | Patch |
| https://git.kernel.org/stable/c/52e2f21911158ec961cd5aae19c56460db382af0 | kernel.org | Patch |
| https://git.kernel.org/stable/c/e72c15085b6d86f45d224d98aa75b5cace4aaab9 | kernel.org | Patch |
| https://git.kernel.org/stable/c/f08b3f451f12eee4abd8a5981803bc36db84458b | 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, < 6.6.145 >= 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 |