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Vulnerability record · CVE-2026-64393 · published 25 July 2026

CVE-2026-64393: Linux kernel vulnerability

Linux · Linux Kernel

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.

9.1 CVSS 3.1 Critical EPSS 0.70% · top 48.6%
9.1CVSS 3.1 base score
0.70%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
4 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/0ce682867fd506f61f40c76bde7e4205bde34e87 Patch
https://git.kernel.org/stable/c/20ee516a62989a8d505ee432f9e59525ea23984e Patch
https://git.kernel.org/stable/c/5cbabf3a71575cd31bc7785d92d4ab42338a654b Patch
https://git.kernel.org/stable/c/8cc9ec711f5255167247a9ab6a7179b787426ed7 Patch
https://git.kernel.org/stable/c/b35afd5cf8fab236ef21117e42ee45691d4ffa7b Patch
https://git.kernel.org/stable/c/b383bcad3d2fe634b26efbce53e22bbb5753a520 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-64393), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.