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Vulnerability record · CVE-2026-64138 · published 19 July 2026

CVE-2026-64138: Linux kernel vulnerability

Linux · Linux Kernel

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.

8.8 CVSS 3.1 High EPSS 0.60% · top 53.4%
8.8CVSS 3.1 base score
0.60%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
18 Aug 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-64138), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.