What is GHSA-p59x-f8qp-h8m2?

GHSA-p59x-f8qp-h8m2 is a security advisory published by GitHub Security Advisories with High severity. In the Linux kernel, the following vulnerability has been resolved: smb/client: fix chown/chgrp...

Which CVE IDs does GHSA-p59x-f8qp-h8m2 cover?

GHSA-p59x-f8qp-h8m2 covers the following CVE IDs: CVE-2026-64388. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-p59x-f8qp-h8m2?

GHSA-p59x-f8qp-h8m2 has a CVSS v3 base score of 7.8, published by GitHub Security Advisories.

GHSA-p59x-f8qp-h8m2HighCVSS 7.8

In the Linux kernel, the following vulnerability has been resolved: smb/client: fix chown/chgrp...

Vendor

GitHub Security Advisories

Published

July 25, 2026

Last Modified

July 27, 2026

🔗 CVE IDs covered (1)

CVE-2026-64388 →

📋 Description

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.

🔗 References (4)

https://nvd.nist.gov/vuln/detail/CVE-2026-64388
https://git.kernel.org/stable/c/550cfb8a81181331d4d0f76ab75ee58a0bf41e3e
https://git.kernel.org/stable/c/760ef2c579c2609cf17fb1cd5392f64d42d43d33
https://github.com/advisories/GHSA-p59x-f8qp-h8m2