UBUNTU-CVE-2026-29518

An rsync daemon configured with "use chroot = no" is exposed to a time-of-check / time-of-use race on parent path components. A local attacker with write access to a module can replace a parent directory component with a symlink between the receiver's check and its open(), redirecting reads (basis-file disclosure) and writes (file overwrite) outside the module. Under elevated daemon privilege this allows privilege escalation. Default "use chroot = yes" is not exposed.