CVE-2026-68083 - ksmbd: fix path resolution in ksmbd_vfs_kern_path_create

CVE-2026-68083 - ksmbd: fix path resolution in ksmbd_vfs_kern_path_create

https://cvefeed.io/rssfeed/latest.atom / Mon, 08/10/2026 - 16:25
CVE ID :CVE-2026-68083
Published : Aug. 10, 2026, 12:17 p.m. | 1 hour, 10 minutes ago
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.
Severity: 0.0 | NA
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