CVE-2026-97554 UNKNOWN

Mô tả

In the Linux kernel, the following vulnerability has been resolved: smb: client: avoid using uninitialized SIDs in cifs_posix_to_fattr() cifs_posix_to_fattr() ignores the return value of posix_info_parse(). When a malformed POSIX directory entry is encountered (e.g. invalid SID lengths from an untrusted server), posix_info_parse() returns -1 without populating the 'parsed' struct. The uninitialized stack memory in parsed.owner and parsed.group is then passed to sid_to_id(), which processes the garbage bytes and passes them to request_key() to construct a SID string, potentially leaking kernel stack contents to the userspace idmap daemon. Fix this by checking the return value and skipping the SID-to-id mapping when parsing fails. The remaining fattr fields (timestamps, mode, etc.) are populated directly from the 'info' pointer so they are unaffected.

Sản phẩm bị ảnh hưởng

Nguồn dữ liệu chưa cung cấp thông tin sản phẩm chi tiết.

Tài liệu tham khảo

• [416baaa9-dc9f-4396-8d5f-8c081fb06d67] https://git.kernel.org/stable/c/c9a8b60ce140a68d172452f418137fc7ddbae7db
• [416baaa9-dc9f-4396-8d5f-8c081fb06d67] https://git.kernel.org/stable/c/da6e25842431982d5a53cf00d925b98c690f4467

Lịch sử thay đổi