CVE-2026-64138

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

19/07/2026

Last modified:

30/07/2026

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate SID in parent security descriptor during ACL inheritance Introduce smb_validate_ntsd_sid() helper to safely validate Owner SID and Group SID inside the NT Security Descriptor (smb_ntsd) retrieved from the parent directory.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 8.80 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x

8.80

Severity 3.x

HIGH

References to Advisories, Solutions, and Tools

https://git.kernel.org/stable/c/18d8db24b0a5b7be4829238dd4022236df02d421
https://git.kernel.org/stable/c/1c9d0646a9959752f11ca1080dc1ff26bd1756cb
https://git.kernel.org/stable/c/69f030cf95488ae1186c72ac8c66fd279664ea7f
https://git.kernel.org/stable/c/f0e5c9c663badc9982e6941322eef1cb17de0f11