{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64668", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-07-20T17:12:12.891Z", "datePublished": "2026-11-11T03:50:14.037Z", "dateUpdated": "2026-11-11T03:50:14.037Z"}, "containers": {"cna": {"title": "pam_usb: deny_remote bypassed by zone-indexed IPv6 addresses (fe80::1%eth0) in pusb_tmux_has_remote_clients", "problemTypes": [{"descriptions": [{"cweId": "CWE-285", "lang": "en", "description": "CWE-285: Improper Authorization", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-693", "lang": "en", "description": "CWE-693: Protection Mechanism Failure", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/mcdope/pam_usb/security/advisories/GHSA-7583-9cqv-j9rf", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/mcdope/pam_usb/security/advisories/GHSA-7583-9cqv-j9rf"}, {"name": "https://github.com/mcdope/pam_usb/pull/423", "tags": ["x_refsource_MISC"], "url": "https://github.com/mcdope/pam_usb/pull/423"}, {"name": "https://github.com/mcdope/pam_usb/commit/a62513f3da871d6576d751de3482eb80b9ac79f3", "tags": ["x_refsource_MISC"], "url": "https://github.com/mcdope/pam_usb/commit/a62513f3da871d6576d751de3482eb80b9ac79f3"}, {"name": "https://github.com/mcdope/pam_usb/releases/tag/0.9.3", "tags": ["x_refsource_MISC"], "url": "https://github.com/mcdope/pam_usb/releases/tag/0.9.3"}], "affected": [{"vendor": "mcdope", "product": "pam_usb", "versions": [{"version": ">= 0.8.0, < 0.9.3", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-11-11T03:50:14.037Z"}, "descriptions": [{"lang": "en", "value": "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 pattern matched the address group and then immediately expected whitespace. On Linux systems with multi-homed network interfaces, w -i appends a zone index (scope identifier) to link-local IPv6 addresses \u2014 e.g. fe80::1%eth0. The %eth0 suffix appeared between the address and the next whitespace field, causing the regex match to fail even for an otherwise-matching remote session. The function returned \"no remote clients\" and granted access. This issue has been patched in version 0.9.3."}], "source": {"advisory": "GHSA-7583-9cqv-j9rf", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "pam_usb", "vendor": "mcdope", "versions": [{"status": "affected", "version": ">= 0.8.0, < 0.9.3"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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 pattern matched the address group and then immediately expected whitespace. On Linux systems with multi-homed network interfaces, w -i appends a zone index (scope identifier) to link-local IPv6 addresses \u2014 e.g. fe80::1%eth0. The %eth0 suffix appeared between the address and the next whitespace field, causing the regex match to fail even for an otherwise-matching remote session. The function returned \"no remote clients\" and granted access. This issue has been patched in version 0.9.3."}], "id": "CVE-2026-64668", "lastModified": "2026-11-11T05:19:51.113", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.2, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-11-11T05:19:51.113", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/mcdope/pam_usb/commit/a62513f3da871d6576d751de3482eb80b9ac79f3"}, {"source": "security-advisories@github.com", "url": "https://github.com/mcdope/pam_usb/pull/423"}, {"source": "security-advisories@github.com", "url": "https://github.com/mcdope/pam_usb/releases/tag/0.9.3"}, {"source": "security-advisories@github.com", "url": "https://github.com/mcdope/pam_usb/security/advisories/GHSA-7583-9cqv-j9rf"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-285"}, {"lang": "en", "value": "CWE-693"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{}