🔐 CVE Alert

CVE-2026-64393

CRITICAL 9.1

ksmbd: run set info with opener credentials

CVSS Score
9.1
EPSS Score
0.0%
EPSS Percentile
0th

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.

Vendor linux
Product linux
Ecosystems
Industries
Technology
Published Jul 25, 2026
Last Updated Aug 17, 2026
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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability

Affected Versions

Linux / Linux
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 5cbabf3a71575cd31bc7785d92d4ab42338a654b e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < b35afd5cf8fab236ef21117e42ee45691d4ffa7b e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 0ce682867fd506f61f40c76bde7e4205bde34e87 e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 20ee516a62989a8d505ee432f9e59525ea23984e e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 8cc9ec711f5255167247a9ab6a7179b787426ed7 e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < b383bcad3d2fe634b26efbce53e22bbb5753a520
Linux / Linux
5.15

References

NVD ↗ CVE.org ↗ EPSS Data ↗
git.kernel.org: https://git.kernel.org/stable/c/5cbabf3a71575cd31bc7785d92d4ab42338a654b git.kernel.org: https://git.kernel.org/stable/c/b35afd5cf8fab236ef21117e42ee45691d4ffa7b git.kernel.org: https://git.kernel.org/stable/c/0ce682867fd506f61f40c76bde7e4205bde34e87 git.kernel.org: https://git.kernel.org/stable/c/20ee516a62989a8d505ee432f9e59525ea23984e git.kernel.org: https://git.kernel.org/stable/c/8cc9ec711f5255167247a9ab6a7179b787426ed7 git.kernel.org: https://git.kernel.org/stable/c/b383bcad3d2fe634b26efbce53e22bbb5753a520