CVE-2026-64138

HighCVSS 8.8/10Last modified Oct 30, 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.

Metrics

CVSS 3.1 8.8/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected software

VendorProductVersions
LinuxLinux>= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < f7c4dee323d9176b8d3f5c69018ee57ae0d4653c; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 8efbea0253b7fa2d1960cab0fed36544ca0b41ab; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < f0e5c9c663badc9982e6941322eef1cb17de0f11; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 18d8db24b0a5b7be4829238dd4022236df02d421; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 1c9d0646a9959752f11ca1080dc1ff26bd1756cb; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 69f030cf95488ae1186c72ac8c66fd279664ea7f
LinuxLinux5.15

References

Timeline

Published
Jul 19, 2026
Last modified
Oct 30, 2026
NVD status
Modified

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CVE-2026-64138: High severity, CVSS 8.8 | Vulnix