CVE-2026-64138 | In the Linux kernel, the following vulnerability has been re… | CVSS 8.8 HIGH

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.

Metadata

CVE ID: CVE-2026-64138
State: PUBLISHED
Assigner: Linux
Reserved: 2026-07-19 07:54 UTC
Published: 2026-07-19 15:40 UTC
Last updated: 2026-07-20 13:43 UTC
Vendor / Product: Linux / Linux
Sources: cve.org · NVD

Severity & Metrics

8.8 HIGH CVSS 3.1

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

Affected products (2)

Vendor	Product	Platform	Versions
Linux	Linux	—	e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < f0e5c9c663badc9982e6941322eef1cb17de0f11, e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 18d8db24b0a5b7be4829238dd4022236df02d421, e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 1c9d0646a9959752f11ca1080dc1ff26bd1756cb, e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 69f030cf95488ae1186c72ac8c66fd279664ea7f
Linux	Linux	—	5.15, 0 < 5.15, 6.12.92 ≤ 6.12., 6.18.34 ≤ 6.18. …

CVSS scores (1)

Score	Severity	Version	Source	Vector
8.8	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References (4)