What is CVE-2026-64138?

CVE-2026-64138 is a unscored severity Linux kernel vulnerability. CVE-2026-64138 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-64138?

CVE-2026-64138 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2026-64138?

Yes, CVE-2026-64138 has been patched. Fixed versions include 6.12.92, 6.18.34, 7.0.11 and others.

Is CVE-2026-64138 actively exploited?

CVE-2026-64138 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-64138

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.

Package Linux Kernel

Published 2026-07-19

Last modified 2026-07-19

Patch available

Yes

Affected versions

Fixed in 6.12.92, 6.18.34, 7.0.11, 7.1 and their respective stable series.

Fixed in

✓ 6.12.92 6.12.x ✓ 6.18.34 6.18.x ✓ 7.0.11 7.0.x ✓ 7.1

References

4 total

Frequently asked questions

What is CVE-2026-64138?

CVE-2026-64138 is a unscored severity Linux kernel vulnerability . CVE-2026-64138 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2026-64138?

Yes — CVE-2026-64138 has been patched. Fixed versions include 6.12.92, 6.18.34, 7.0.11 and others.
Is CVE-2026-64138 actively exploited?

No — CVE-2026-64138 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.