CVE-2026-47269

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{"affected": [{"affectedData": [{"product": "pam_usb", "vendor": "mcdope", "versions": [{"status": "affected", "version": "< 0.9.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.0, pam_usb's deny_remote feature checks utmpx ut_addr_v6 to detect whether an authentication request originates from a remote session. The outer guard was if (utent->ut_addr_v6[0] != 0), which only tests the first 32-bit word of the 128-bit address field. IPv4-mapped IPv6 addresses (::ffff:x.x.x.x) store the IPv4 address in ut_addr_v6[3] with ut_addr_v6[0] == 0. On systems where the SSH daemon listens on :: (IPv6 wildcard) with AddressFamily any -- common on Ubuntu and Debian -- incoming IPv4 connections are recorded in utmpx as IPv4-mapped IPv6 addresses. The outer check evaluates to false, the remote-detection block is skipped entirely, and the session is treated as local. deny_remote=true does not block the authentication. An attacker with physical access to a registered USB device can authenticate over SSH on an affected system as if they were sitting at a local terminal, bypassing the deny_remote restriction. This vulnerability is fixed in 0.9.0."}, {"lang": "es", "value": "pam_usb proporciona autenticaci\u00f3n de hardware para Linux utilizando medios extra\u00edbles ordinarios. Antes de la versi\u00f3n 0.9.0, la caracter\u00edstica deny_remote de pam_usb verifica utmpx ut_addr_v6 para detectar si una solicitud de autenticaci\u00f3n se origina de una sesi\u00f3n remota. La protecci\u00f3n externa era if (utent -> ut_addr_v6[0] != 0), que solo prueba la primera palabra de 32 bits del campo de direcci\u00f3n de 128 bits. Las direcciones IPv6 mapeadas a IPv4 (::ffff:x.x.x.x) almacenan la direcci\u00f3n IPv4 en ut_addr_v6[3] con ut_addr_v6[0] == 0. En sistemas donde el demonio SSH escucha en :: (comod\u00edn IPv6) con AddressFamily any -- com\u00fan en Ubuntu y Debian -- las conexiones IPv4 entrantes se registran en utmpx como direcciones IPv6 mapeadas a IPv4. La verificaci\u00f3n externa se eval\u00faa como falsa, el bloque de detecci\u00f3n remota se omite por completo y la sesi\u00f3n se trata como local. deny_remote=true no bloquea la autenticaci\u00f3n. Un atacante con acceso f\u00edsico a un dispositivo USB registrado puede autenticarse a trav\u00e9s de SSH en un sistema afectado como si estuviera sentado en un terminal local, eludiendo la restricci\u00f3n deny_remote. Esta vulnerabilidad se corrige en la versi\u00f3n 0.9.0."}], "id": "CVE-2026-47269", "lastModified": "2026-10-26T12:10:00.130", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-47269", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-05-28T12:50:16.970323Z", "version": "2.0.3"}}]}, "published": "2026-05-27T21:16:18.810", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/mcdope/pam_usb/commit/804fe24eae3d742d8be05fd015e36abc3c7d94e5"}, {"source": "security-advisories@github.com", "url": "https://github.com/mcdope/pam_usb/security/advisories/GHSA-jmmj-qhrq-w45g"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-284"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,0.9.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "pam_usb", "source": "cna", "vendor": "mcdope"}, "product": "pam_usb", "vendor": "mcdope"}], "created": "2026-05-27T22:30:35.626650+00:00", "updated": "2026-05-29T15:50:01.663500+00:00", "vendors": ["mcdope", "mcdope$PRODUCT$pam_usb"]}