{"id":"CVE-2026-68083","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-68083","summary":"ksmbd: fix path resolution in ksmbd_vfs_kern_path_create","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix path resolution in ksmbd_vfs_kern_path_create\n\nThe SMB2 open lookup is rooted at the share with LOOKUP_BENEATH, but the\ncreate/mkdir/hardlink sink is not: ksmbd_vfs_kern_path_create() builds an\nabsolute path with convert_to_unix_name() and resolves it from AT_FDCWD\nvia start_creating_path(), so a \"..\" component is walked from the real\nfilesystem root and escapes the export.\n\nAn authenticated client races a missing path component so the rooted open\nlookup returns -ENOENT (taking the create branch) while the same component\nis present (a directory) when the create walk runs; the create then\nresolves \"..\" out of the share.\n\nRoot the create walk at the share like the lookup and rename paths already\nare: resolve the parent with vfs_path_parent_lookup(..., LOOKUP_BENEATH,\n&share_conf->vfs_path) and create the final component with\nstart_creating_noperm(). convert_to_unix_name() then has no callers and is\nremoved.","published":"2026-08-10T11:41:47.153Z","modified":"2026-08-14T04:03:31.537594159Z","cvss":{"score":9.1,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.12.97"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1c8951963d8ed357f70f59e0ad4ddce2199d2016"},{"type":"WEB","url":"https://git.kernel.org/stable/c/489d1ded01425c0fb33418172c0e4e588467526b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/98185b3025beeae92d1fe700d5db26b9ac4bf025"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c7c884a1305aa4540eb7942a50bd356b34120e1f"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68083.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68083"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-14T04:03:31.537594159Z"}}