What is CVE-2026-64391?

CVE-2026-64391 is a unscored severity Linux kernel vulnerability. CVE-2026-64391 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-64391?

CVE-2026-64391 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2026-64391?

Yes, CVE-2026-64391 has been patched. Fixed versions include 6.12.96, 6.18.39, 7.1.4 and others.

Is CVE-2026-64391 actively exploited?

CVE-2026-64391 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-64391

In the Linux kernel, the following vulnerability has been resolved: ksmbd: use opener credentials for ADS I/O Alternate data streams are stored as xattrs. Unlike regular file I/O, their read and write paths therefore call VFS xattr helpers which recheck inode permissions and LSM policy using the current task credentials. Run ADS I/O with the credentials captured when the SMB handle was opened.

Package Linux Kernel

Published 2026-07-25

Last modified 2026-07-25

Patch available

Yes

Affected versions

Fixed in 6.12.96, 6.18.39, 7.1.4, 7.2-rc1 and their respective stable series.

Fixed in

✓ 6.12.96 6.12.x ✓ 6.18.39 6.18.x ✓ 7.1.4 7.1.x ✓ 7.2-rc1

References

4 total

Frequently asked questions

What is CVE-2026-64391?

CVE-2026-64391 is a unscored severity Linux kernel vulnerability . CVE-2026-64391 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2026-64391?

Yes. CVE-2026-64391 has been patched. Fixed versions include 6.12.96, 6.18.39, 7.1.4 and others.
Is CVE-2026-64391 actively exploited?

No. CVE-2026-64391 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.