CVE-2026-47270 pam_usb: strtok() race condition in multi-threaded PAM hosts can corrupt deny_remote result

pamusb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.0, pamusb is a PAM module loaded into the host process sudo, login, GDM, GNOME Shell. Display managers such as GDM run multiple concurrent authentication threads. Three functions used by the denyremote...

CVE-2026-47269: Improper Access Control

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...