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.
CVE-2026-64388
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-64388
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "b326614ea2159ea5c835d320f261d05d080cd201",
"lessThan": "6825a45f6b8ef76b0ee32649ec3d6e39ca143a18",
"versionType": "git"
},
{
"status": "affected",
"version": "b326614ea2159ea5c835d320f261d05d080cd201",
"lessThan": "27ead8c5418af6bfab711079fecb9414d78d4cae",
"versionType": "git"
},
{
"status": "affected",
"version": "b326614ea2159ea5c835d320f261d05d080cd201",
"lessThan": "3eaec47518e126e6dcd1a48521d740278073f0ec",
"versionType": "git"
},
{
"status": "affected",
"version": "b326614ea2159ea5c835d320f261d05d080cd201",
"lessThan": "550cfb8a81181331d4d0f76ab75ee58a0bf41e3e",
"versionType": "git"
},
{
"status": "affected",
"version": "b326614ea2159ea5c835d320f261d05d080cd201",
"lessThan": "760ef2c579c2609cf17fb1cd5392f64d42d43d33",
"versionType": "git"
}
],
"programFiles": [
"fs/smb/client/inode.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.18"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.18",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.57",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.4",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/smb/client/inode.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-64388
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #46435 · Revision 1
- Added to Heist Feed
- Publisher date