{"id":"CVE-2026-74522","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-74522","summary":"ksmbd: fix use-after-free in __close_file_table_ids()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in __close_file_table_ids()\n\nA ksmbd_file can remain alive after logical close while another session\nholds a temporary reference obtained through ksmbd_lookup_fd_inode().\nksmbd_close_fd() currently marks the file closed and drops the idr-owned\nreference, but leaves the pointer published in the closing session's idr\nuntil the final reference is dropped.\n\nIf the foreign holder performs the final ksmbd_fd_put(), __put_fd_final()\nsupplies the foreign session's file table to __ksmbd_close_fd(). The object\nis then freed without being removed from its owner's idr, and the owner\nsession later dereferences the stale pointer during file-table teardown.\n\nRemove the volatile id from the owner's idr while ksmbd_close_fd() still\nholds that table's lock, and clear volatile_id before dropping\nthe idr-owned reference. A later foreign final put then only performs\nphysical destruction and cannot remove the object from the wrong table.","published":"2026-08-15T12:27:39.945Z","modified":"2026-08-18T03:56:50.448765041Z","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.6.151"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0c3918c2cee62ec6c9de8d5c73ebfe6f833961ac"},{"type":"WEB","url":"https://git.kernel.org/stable/c/67aaec2a1fdce3e1dde46c45b5d1ef8cf22f65cd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9be4a66f019ea90bd9deca70511f4f9ffebf5c6f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cffbdc86393b0235383a20c8c59bc32f16036459"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e7188199eff46a636f3436356f0aae039be6dd66"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74522.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74522"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-18T03:56:50.448765041Z"}}