CVE-2026-68083ksmbd: fix path resolution in ksmbd_vfs_kern_path_create
- 9.1CriticalCVSS base score
- 0.48%Exploitation in 30 daysEPSS · top 58% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 11 days later
· 11 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H |
| NVDNVD · Received | 3.1 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.48% · top 58% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.1.
Affected products
- affected 265fd1991c1db85fbabaad4946ca0e63e2ae688d – < f1f53dc95edfb3d2072e5e8cd8eb9a2fe7d7f2d0
- affected 265fd1991c1db85fbabaad4946ca0e63e2ae688d – < a2516be69048856e2a49a51e00975dc59431f95c
- affected 265fd1991c1db85fbabaad4946ca0e63e2ae688d – < 489d1ded01425c0fb33418172c0e4e588467526b
- affected 265fd1991c1db85fbabaad4946ca0e63e2ae688d – < c7c884a1305aa4540eb7942a50bd356b34120e1f
- affected 265fd1991c1db85fbabaad4946ca0e63e2ae688d – < 98185b3025beeae92d1fe700d5db26b9ac4bf025
- affected 265fd1991c1db85fbabaad4946ca0e63e2ae688d – < 1c8951963d8ed357f70f59e0ad4ddce2199d2016
- affected 5.15
- unaffected < 5.15
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.160 – ≤ 6.6.*
- unaffected 6.12.97 – ≤ 6.12.*
- unaffected 6.18.40 – ≤ 6.18.*
- unaffected 7.1.5 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References6
- https://git.kernel.org/stable/c/f1f53dc95edfb3d2072e5e8cd8eb9a2fe7d7f2d0 (opens in a new tab)
- https://git.kernel.org/stable/c/a2516be69048856e2a49a51e00975dc59431f95c (opens in a new tab)
- https://git.kernel.org/stable/c/489d1ded01425c0fb33418172c0e4e588467526b (opens in a new tab)
- https://git.kernel.org/stable/c/c7c884a1305aa4540eb7942a50bd356b34120e1f (opens in a new tab)
- https://git.kernel.org/stable/c/98185b3025beeae92d1fe700d5db26b9ac4bf025 (opens in a new tab)
- https://git.kernel.org/stable/c/1c8951963d8ed357f70f59e0ad4ddce2199d2016 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-55264 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-68083)Record last updated .