smb: client: honor forceuid/forcegid when mapping SIDs to uid/gid
In the Linux kernel, the following vulnerability has been resolved: smb: client: honor forceuid/forcegid when mapping SIDs to uid/gid When the administrator mounts with forceuid or forcegid (uid=/gid= mount options), they expect all files to appear owned by the specified user/group. However, several code paths unconditionally called sid_to_id() to overwrite cf_uid/cf_gid with server-provided values, ignoring the administrator's explicit override: - smb311_posix_info_to_fattr() (stat via POSIX extensions) - cifs_posix_to_fattr() (readdir via POSIX extensions) - parse_sec_desc() (CIFS ACL ownership mapping) This allowed an untrusted server to dictate local file ownership even when the mount was configured to force specific uid/gid values. Fix all three call sites to check CIFS_MOUNT_OVERR_UID and CIFS_MOUNT_OVERR_GID before calling sid_to_id(), following the same pattern already used by cifs_unix_basic_to_fattr() for unix extensions.
CVE-2026-97561
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-2026-97561
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": "9409ae58e0759d010b347e7b19ebc90ab5d4b98f",
"lessThan": "be6eccccec867c22d7c65fab4ea4e91ec3d5b8c6",
"versionType": "git"
},
{
"status": "affected",
"version": "9409ae58e0759d010b347e7b19ebc90ab5d4b98f",
"lessThan": "bc35de451c128d399ad185d6269f8847e97cd1c9",
"versionType": "git"
},
{
"status": "affected",
"version": "9409ae58e0759d010b347e7b19ebc90ab5d4b98f",
"lessThan": "6ac7a29691558bed18e2df1780636b8aa0fd13d5",
"versionType": "git"
},
{
"status": "affected",
"version": "9409ae58e0759d010b347e7b19ebc90ab5d4b98f",
"lessThan": "e1b74f8f8c1d13190b09fe623b729d36b7ac22a8",
"versionType": "git"
},
{
"status": "affected",
"version": "9409ae58e0759d010b347e7b19ebc90ab5d4b98f",
"lessThan": "18a72975e9f35aadecc75b031f693f2d1f49308f",
"versionType": "git"
}
],
"programFiles": [
"fs/smb/client/cifsacl.c",
"fs/smb/client/inode.c",
"fs/smb/client/readdir.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.0"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.0",
"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": "7.2.7",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/smb/client/cifsacl.c",
"fs/smb/client/inode.c",
"fs/smb/client/readdir.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-97561
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48786 · Revision 1
- Added to Heist Feed
- Publisher date