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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00168.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 affected < f0e5c9c663badc9982e6941322eef1cb17de0f11
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 affected < 18d8db24b0a5b7be4829238dd4022236df02d421
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 affected < 1c9d0646a9959752f11ca1080dc1ff26bd1756cb
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 affected < 69f030cf95488ae1186c72ac8c66fd279664ea7f
Linux Linux affected
Version Status Constraints
5.15 affected —
0 unaffected < 5.15
6.12.92 unaffected ≤ 6.12.*
6.18.34 unaffected ≤ 6.18.*
7.0.11 unaffected ≤ 7.0.*
7.1 unaffected ≤ *

No data.

No data.

No data.

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Vendors Products
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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/18d8db24b0a5b7be4829238dd4022236df02d421 cve-icon
https://git.kernel.org/stable/c/1c9d0646a9959752f11ca1080dc1ff26bd1756cb cve-icon
https://git.kernel.org/stable/c/69f030cf95488ae1186c72ac8c66fd279664ea7f cve-icon
https://git.kernel.org/stable/c/f0e5c9c663badc9982e6941322eef1cb17de0f11 cve-icon
History

Mon, 20 Jul 2026 14:45:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

Sun, 19 Jul 2026 16:15:00 +0000

Type Values Removed Values Added
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.
Title ksmbd: validate SID in parent security descriptor during ACL inheritance
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-07-20T13:43:43.352Z

Reserved: 2026-07-19T07:54:57.037Z

Link: CVE-2026-64138

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses

No weakness.