Bug 2502495 (CVE-2026-64138) - CVE-2026-64138 kernel: ksmbd: validate SID in parent security descriptor during ACL inheritance
Summary: CVE-2026-64138 kernel: ksmbd: validate SID in parent security descriptor duri...
Keywords:
Status: NEW
Alias: CVE-2026-64138
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
unspecified
unspecified
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-19 17:02 UTC by OSIDB Bzimport
Modified: 2026-07-21 07:15 UTC (History)
2 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-07-19 17:02:29 UTC 
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.
Comment 1 TEJ RATHI 2026-07-21 07:04:50 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026071928-CVE-2026-64138-e6dd@gregkh/T
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