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CVE Vulnerability Details :
CVE-2026-64388
PUBLISHED
More InfoOfficial Page
Assigner-Linux
Assigner Org ID-416baaa9-dc9f-4396-8d5f-8c081fb06d67
View Known Exploited Vulnerability (KEV) details
Published At-25 Jul, 2026 | 08:50
Updated At-27 Jul, 2026 | 05:00
Rejected At-
▼CVE Numbering Authority (CNA)
smb/client: fix chown/chgrp with SMB3 POSIX Extensions

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 Products
Vendor
Linux Kernel Organization, IncLinux
Product
Linux
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Program Files
  • fs/smb/client/inode.c
Default Status
unaffected
Versions
Affected
  • From b326614ea2159ea5c835d320f261d05d080cd201 before 550cfb8a81181331d4d0f76ab75ee58a0bf41e3e (git)
  • From b326614ea2159ea5c835d320f261d05d080cd201 before 760ef2c579c2609cf17fb1cd5392f64d42d43d33 (git)
Vendor
Linux Kernel Organization, IncLinux
Product
Linux
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Program Files
  • fs/smb/client/inode.c
Default Status
affected
Versions
Affected
  • 4.18
Unaffected
  • From 0 before 4.18 (semver)
  • From 7.1.4 through 7.1.* (semver)
  • From 7.2-rc1 through * (original_commit_for_fix)
Metrics
VersionBase scoreBase severityVector
3.17.8HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://git.kernel.org/stable/c/550cfb8a81181331d4d0f76ab75ee58a0bf41e3e
N/A
https://git.kernel.org/stable/c/760ef2c579c2609cf17fb1cd5392f64d42d43d33
N/A
Hyperlink: https://git.kernel.org/stable/c/550cfb8a81181331d4d0f76ab75ee58a0bf41e3e
Resource: N/A
Hyperlink: https://git.kernel.org/stable/c/760ef2c579c2609cf17fb1cd5392f64d42d43d33
Resource: N/A
Details not found