CVE-2026-48066 — pam_usb: Thread-unsafe static pointer in log.c causes data race under concurrent PAM authentication
pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.1, src/log.c contains a process-wide static pointer that is written on every PAM …
Published: 2026-05-27 · CVSS: 5.7 · CVSS 3.1
pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.1, src/log.c contains a process-wide static pointer that is written on every PAM invocation with the address of a stack-local variable. This violates the PAM re-entrancy requirement and creates a data race when the PAM stack is invoked concurrently from multiple threads. This vulnerability is fixed in 0.9.1.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7