CVE-2026-47273 pam_usb: XPath injection via PAM-supplied identifiers in pam_usb configuration queries

pamusb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.0, pamusb builds XPath expressions from user-supplied identifiers PAM username, service name and device-supplied identifiers USB device serial, model, vendor to query /etc/pamusb.conf. These identifiers...

CVE-2026-47273

CVE-2026-47273 affects pam_usb on Linux prior to 0.9.0. The vulnerability arises when pam_usb builds XPath expressions from user-supplied identifiers (PAM username, service name) and device-supplied identifiers (USB serial, model, vendor) to query /etc/pamusb.conf without validating XPath metacha...