CVE-2026-68083

CriticalCVSS 9.1/10Last modified Oct 30, 2026

Description

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.

Metrics

CVSS 3.1 9.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 265fd1991c1db85fbabaad4946ca0e63e2ae688d, < f1f53dc95edfb3d2072e5e8cd8eb9a2fe7d7f2d0; >= 265fd1991c1db85fbabaad4946ca0e63e2ae688d, < a2516be69048856e2a49a51e00975dc59431f95c; >= 265fd1991c1db85fbabaad4946ca0e63e2ae688d, < 489d1ded01425c0fb33418172c0e4e588467526b; >= 265fd1991c1db85fbabaad4946ca0e63e2ae688d, < c7c884a1305aa4540eb7942a50bd356b34120e1f; >= 265fd1991c1db85fbabaad4946ca0e63e2ae688d, < 98185b3025beeae92d1fe700d5db26b9ac4bf025; >= 265fd1991c1db85fbabaad4946ca0e63e2ae688d, < 1c8951963d8ed357f70f59e0ad4ddce2199d2016
LinuxLinux5.15

References

Timeline

Published
Aug 10, 2026
Last modified
Oct 30, 2026
NVD status
Received

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CVE-2026-68083: Critical severity, CVSS 9.1 | Vulnix