CVE-2026-78422 zbus_polkit: polkit authorization bypass via PID reuse due to incorrect D-Bus type for the subject UID

Subject::newforowner in the zbuspolkit crate encodes the uid entry of a unix-process polkit subject as an unsigned 32-bit integer D-Bus type u, whereas the org.freedesktop.PolicyKit1.Authority interface specifies a signed 32-bit integer D-Bus type i. Because of this type mismatch, polkit silently...

CVE-2026-78422

CVE-2026-78422 affects the zbus_polkit Rust crate (before 5.1.0 ). The function Subject::new_for_owner() encodes the UID of a unix-process polkit subject as an unsigned 32-bit integer (D-Bus type u), while the org.freedesktop.PolicyKit1.Authority interface expects a signed 32-bit integer (type i)...