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CVE-2026-64388

smb/client: fix chown/chgrp with SMB3 POSIX Extensions PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected b326614ea2159ea5c835d320f261d05d080cd201 before 6825a45f6b8ef76b0ee32649ec3d6e39ca143a18; affected b326614ea2159ea5c835d320f261d05d080cd201 before 27ead8c5418af6bfab711079fecb9414d78d4cae; affected b326614ea2159ea5c835d320f261d05d080cd201 before 3eaec47518e126e6dcd1a48521d740278073f0ec; affected b326614ea2159ea5c835d320f261d05d080cd201 before 550cfb8a81181331d4d0f76ab75ee58a0bf41e3e; affected b326614ea2159ea5c835d320f261d05d080cd201 before 760ef2c579c2609cf17fb1cd5392f64d42d43d33
Linux / Linuxaffected 4.18; unaffected 0 before 4.18; unaffected 6.6.160 through 6.6.*; unaffected 6.12.114 through 6.12.*; unaffected 6.18.57 through 6.18.*; unaffected 7.1.4 through 7.1.*; unaffected 7.2 through *

CWE

No CWE identifiers supplied.

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.