{"id":"CVE-2026-64669","published":"2026-11-11T05:19:51.327","lastModified":"2026-11-11T05:19:51.327","description":"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.","cvssScore":7.4,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","cwes":["CWE-285","CWE-693"],"vendors":[],"products":[],"references":[{"url":"https://github.com/mcdope/pam_usb/commit/a62513f3da871d6576d751de3482eb80b9ac79f3","tags":[]},{"url":"https://github.com/mcdope/pam_usb/pull/423","tags":[]},{"url":"https://github.com/mcdope/pam_usb/releases/tag/0.9.3","tags":[]},{"url":"https://github.com/mcdope/pam_usb/security/advisories/GHSA-gc4c-v52c-2v34","tags":[]}],"exploitRefs":[{"url":"https://github.com/mcdope/pam_usb/commit/a62513f3da871d6576d751de3482eb80b9ac79f3","tags":[]},{"url":"https://github.com/mcdope/pam_usb/pull/423","tags":[]},{"url":"https://github.com/mcdope/pam_usb/releases/tag/0.9.3","tags":[]},{"url":"https://github.com/mcdope/pam_usb/security/advisories/GHSA-gc4c-v52c-2v34","tags":[]}],"hasPoc":true,"ai":null}