CVE-2026-68083

Last refreshed2026-10-23

Status: UPDATED | Advisory ID: CVE-2026-68083

Key Details

CVE	CVE-2026-68083
CVSS Score / Version	9.1 (Critical) / CVSS v3.1
Updated	2026-10-21
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H`
CVSS Prose	attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is none; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-68083
CVE	https://www.cve.org/CVERecord?id=CVE-2026-68083

Source

Reference

NVD

CVE