CVE-2026-64669

pam_usb provides hardware authentication for Linux using removable media. From version 0.8.0 to before version 0.9.3, the deny_remote feature in pam_usb uses /usr/bin/w -i to detect whether the authenticating user has an active remote tmux session. In pusb_tmux_has_remote_clients() (src/tmux.c), the IPv6 detection regex required exactly four explicit colon-separated groups of 1-4 hex digits (e.g. 2001:0db8:85a3:0000). Any IPv6 address in compressed notation — including loopback (::1), link-local (fe80::1), and global unicast addresses (2001:db8::1) — did not match this pattern. As a result the remote-client check silently returned "no remote clients" even when a remote tmux client was connected from such an address. This issue has been patched in version 0.9.3.

• CWE-285
• CWE-693

• https://github.com/mcdope/pam_usb/commit/a62513f3da871d6576d751de3482eb80b9ac79f3
• https://github.com/mcdope/pam_usb/pull/423
• https://github.com/mcdope/pam_usb/releases/tag/0.9.3
• https://github.com/mcdope/pam_usb/security/advisories/GHSA-gc4c-v52c-2v34

Published

Nov 11, 2026

Last Modified

Nov 11, 2026

Status

Received

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