{"api_version":"1","generated_at":"2026-11-11T05:45:00+00:00","cve":"CVE-2026-64669","urls":{"html":"https://cve.report/CVE-2026-64669","api":"https://cve.report/api/cve/CVE-2026-64669.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64669","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64669"},"summary":{"title":"pam_usb: deny_remote bypassed by compressed IPv6 addresses in pusb_tmux_has_remote_clients","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. 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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. 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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.","Type":"Description","Title":"pam_usb: deny_remote bypassed by compressed IPv6 addresses in pu"}]}}}