CVE-2026-64393

ksmbd: run set info with opener credentials

State: Published
Severity: 9.1 Critical
Published: Jul 25, 2026
Updated: Aug 17, 2026
Reserved: Jul 19, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	9.1 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 5cbabf3a71575cd31bc7785d92d4ab42338a654bAffected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before b35afd5cf8fab236ef21117e42ee45691d4ffa7bAffected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 0ce682867fd506f61f40c76bde7e4205bde34e87Affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 20ee516a62989a8d505ee432f9e59525ea23984eAffected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 8cc9ec711f5255167247a9ab6a7179b787426ed7Affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before b383bcad3d2fe634b26efbce53e22bbb5753a520Affected
LinuxLinux	5.15Affected before 5.15Not affected 6.1.178 through 6.1.Not affected 6.6.145 through 6.6.Not affected 6.12.96 through 6.12.Not affected 6.18.39 through 6.18.Not affected 7.1.4 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 5cbabf3a71575cd31bc7785d92d4ab42338a654bAffected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before b35afd5cf8fab236ef21117e42ee45691d4ffa7bAffected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 0ce682867fd506f61f40c76bde7e4205bde34e87Affected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 20ee516a62989a8d505ee432f9e59525ea23984eAffected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 8cc9ec711f5255167247a9ab6a7179b787426ed7Affected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before b383bcad3d2fe634b26efbce53e22bbb5753a520Affected

LinuxLinux

5.15Affected
before 5.15Not affected
6.1.178 through 6.1.*Not affected
6.6.145 through 6.6.*Not affected
6.12.96 through 6.12.*Not affected
6.18.39 through 6.18.*Not affected
7.1.4 through 7.1.*Not affected
7.2 and laterNot affected

References

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