9.1

CVE-2026-68083

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerLinux
≫
Produkt Linux
Default Statusunaffected
Version 265fd1991c1db85fbabaad4946ca0e63e2ae688d
Version < 489d1ded01425c0fb33418172c0e4e588467526b
Status affected
Version 265fd1991c1db85fbabaad4946ca0e63e2ae688d
Version < c7c884a1305aa4540eb7942a50bd356b34120e1f
Status affected
Version 265fd1991c1db85fbabaad4946ca0e63e2ae688d
Version < 98185b3025beeae92d1fe700d5db26b9ac4bf025
Status affected
Version 265fd1991c1db85fbabaad4946ca0e63e2ae688d
Version < 1c8951963d8ed357f70f59e0ad4ddce2199d2016
Status affected
HerstellerLinux
≫
Produkt Linux
Default Statusaffected
Version 5.15
Status affected
Version 0
Version < 5.15
Status unaffected
Version <= 6.12.*
Version 6.12.97
Status unaffected
Version <= 6.18.*
Version 6.18.40
Status unaffected
Version <= 7.1.*
Version 7.1.5
Status unaffected
Version <= *
Version 7.2
Status unaffected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.45% 0.37
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
416baaa9-dc9f-4396-8d5f-8c081fb06d67 9.1 3.9 5.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Es wurden noch keine Informationen zu CWE veröffentlicht.
https://git.kernel.org/stable/c/489d1ded01425c0fb33418172c0e4e588467526b
https://git.kernel.org/stable/c/c7c884a1305aa4540eb7942a50bd356b34120e1f
https://git.kernel.org/stable/c/98185b3025beeae92d1fe700d5db26b9ac4bf025
https://git.kernel.org/stable/c/1c8951963d8ed357f70f59e0ad4ddce2199d2016