CVE-2026-47269 pam_usb: deny_remote feature incorrectly classifies IPv4-mapped IPv6 remote connections as local

pamusb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.0, pamusb's denyremote feature checks utmpx utaddrv6 to detect whether an authentication request originates from a remote session. The outer guard was if utent-utaddrv60 != 0, which only tests the first...