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NVD Vulnerability Details :

CVE-2026-64388

Received

Source-416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published At-25 Jul, 2026 | 10:17

Updated At-27 Jul, 2026 | 05:16

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.

Date Added	Due Date	Vulnerability Name	Required Action
	N/A

Metrics

Type	Version	Base score	Base severity	Vector
Secondary	3.1	7.8	HIGH	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Type: Secondary

Version: 3.1

Base score: 7.8

Base severity: HIGH

Vector:

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Hyperlink	Source	Resource
https://git.kernel.org/stable/c/550cfb8a81181331d4d0f76ab75ee58a0bf41e3e	416baaa9-dc9f-4396-8d5f-8c081fb06d67	N/A
https://git.kernel.org/stable/c/760ef2c579c2609cf17fb1cd5392f64d42d43d33	416baaa9-dc9f-4396-8d5f-8c081fb06d67	N/A

Hyperlink: https://git.kernel.org/stable/c/550cfb8a81181331d4d0f76ab75ee58a0bf41e3e

Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Resource: N/A

Hyperlink: https://git.kernel.org/stable/c/760ef2c579c2609cf17fb1cd5392f64d42d43d33

Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Resource: N/A

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