CVE-2026-64388
7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | b326614ea2159ea5c835d320f261d05d080cd201 < 550cfb8a81181331d4d0f76ab75ee58a0bf41e3e | affected |
| Linux | Linux | b326614ea2159ea5c835d320f261d05d080cd201 < 760ef2c579c2609cf17fb1cd5392f64d42d43d33 | affected |
| Linux | Linux | 4.18 | affected |
| Linux | Linux | 0 < 4.18 | unaffected |
| Linux | Linux | 7.1.4 <= 7.1.* | unaffected |
| Linux | Linux | 7.2-rc1 <= * | unaffected |
Weaknesses
References
- https://git.kernel.org/stable/c/550cfb8a81181331d4d0f76ab75ee58a0bf41e3e
- https://git.kernel.org/stable/c/760ef2c579c2609cf17fb1cd5392f64d42d43d33
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