What is CVE-2026-64388?

CVE-2026-64388 is a unscored severity Linux kernel vulnerability. CVE-2026-64388 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-64388?

CVE-2026-64388 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2026-64388?

Yes, CVE-2026-64388 has been patched. Fixed versions include 7.1.4 and 7.2-rc1.

Is CVE-2026-64388 actively exploited?

CVE-2026-64388 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-64388

In the Linux kernel, the following vulnerability has been resolved: smb/client: fix chown/chgrp with SMB3 POSIX Extensions Ownership (chown) and group (chgrp) modifications were being ignored when mounting with SMB3 POSIX Extensions unless CIFS_MOUNT_CIFS_ACL or CIFS_MOUNT_MODE_FROM_SID were also explicitly set. Fix this by checking for posix_extensions in cifs_setattr_nounix() when updating UID and GID, ensuring that id_mode_to_cifs_acl() is called to map and set the ownership/group information on the server.

Package Linux Kernel

Published 2026-07-25

Last modified 2026-07-25

Patch available

Yes

Affected versions

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

Fixed in

✓ 7.1.4 7.1.x ✓ 7.2-rc1

References

2 total

Frequently asked questions

What is CVE-2026-64388?

CVE-2026-64388 is a unscored severity Linux kernel vulnerability . CVE-2026-64388 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2026-64388?

Yes. CVE-2026-64388 has been patched. Fixed versions include 7.1.4 and 7.2-rc1.
Is CVE-2026-64388 actively exploited?

No. CVE-2026-64388 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.