ksmbd: fix path resolution in ksmbd_vfs_kern_path_create
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix path resolution in ksmbd_vfs_kern_path_create The SMB2 open lookup is rooted at the share with LOOKUP_BENEATH, but the create/mkdir/hardlink sink is not: ksmbd_vfs_kern_path_create() builds an absolute path with convert_to_unix_name() and resolves it from AT_FDCWD via start_creating_path(), so a ".." component is walked from the real filesystem root and escapes the export. An authenticated client races a missing path component so the rooted open lookup returns -ENOENT (taking the create branch) while the same component is present (a directory) when the create walk runs; the create then resolves ".." out of the share. Root the create walk at the share like the lookup and rename paths already are: resolve the parent with vfs_path_parent_lookup(..., LOOKUP_BENEATH, &share_conf->vfs_path) and create the final component with start_creating_noperm(). convert_to_unix_name() then has no callers and is removed.
CVE-2026-68083
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-2026-68083
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": "265fd1991c1db85fbabaad4946ca0e63e2ae688d",
"lessThan": "a2516be69048856e2a49a51e00975dc59431f95c",
"versionType": "git"
},
{
"status": "affected",
"version": "265fd1991c1db85fbabaad4946ca0e63e2ae688d",
"lessThan": "489d1ded01425c0fb33418172c0e4e588467526b",
"versionType": "git"
},
{
"status": "affected",
"version": "265fd1991c1db85fbabaad4946ca0e63e2ae688d",
"lessThan": "c7c884a1305aa4540eb7942a50bd356b34120e1f",
"versionType": "git"
},
{
"status": "affected",
"version": "265fd1991c1db85fbabaad4946ca0e63e2ae688d",
"lessThan": "98185b3025beeae92d1fe700d5db26b9ac4bf025",
"versionType": "git"
},
{
"status": "affected",
"version": "265fd1991c1db85fbabaad4946ca0e63e2ae688d",
"lessThan": "1c8951963d8ed357f70f59e0ad4ddce2199d2016",
"versionType": "git"
}
],
"programFiles": [
"fs/smb/server/misc.c",
"fs/smb/server/misc.h",
"fs/smb/server/vfs.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/smb/server/misc.c",
"fs/smb/server/misc.h",
"fs/smb/server/vfs.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-68083
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #46444 · Revision 1
- Added to Heist Feed
- Publisher date