CVE-2026-64388

HIGH

MEDIUM Priority: 0.01 BB Relevance: 41/100

Published: 2026-07-25 Modified: 2026-10-30 First seen: 2026-10-30 Status: active

Attack Surface

Low Complexity No Interaction Conf. Impact Integ. Impact

CVSS Vector Breakdown

AV: Local

AC: Low

PR: Low

UI: None

S: Unchanged

C: High

I: High

A: High

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.

Weakness Classification (1)

CWE-682

Affected Software (8)

Vendor	Product	Version
Linux	Linux	b326614ea2159ea5c835d320f261d05d080cd201 < c0fe1118a1471d459f76c3e70ff2abbf784ce6bf
Linux	Linux	b326614ea2159ea5c835d320f261d05d080cd201 < 6825a45f6b8ef76b0ee32649ec3d6e39ca143a18
Linux	Linux	b326614ea2159ea5c835d320f261d05d080cd201 < 27ead8c5418af6bfab711079fecb9414d78d4cae
Linux	Linux	b326614ea2159ea5c835d320f261d05d080cd201 < 3eaec47518e126e6dcd1a48521d740278073f0ec
Linux	Linux	b326614ea2159ea5c835d320f261d05d080cd201 < 550cfb8a81181331d4d0f76ab75ee58a0bf41e3e
Linux	Linux	b326614ea2159ea5c835d320f261d05d080cd201 < 760ef2c579c2609cf17fb1cd5392f64d42d43d33
Linux	Linux	4.18
linux	linux_kernel	4.18 – 7.1.4