pam_usb: OTP pad authentication bypass via missing system pad check and uninitialized RNG buffer_CVE-2026-47272

{
    "lastseen": "",
    "description": "pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.0, the pusb_pad_compare() function in src/pad.c only verified that the user-side pad (~/.pamusb/device.pad) could be read, but did not enforce that the system-side pad (the pad file on the USB device) was also present and readable. If the user-side pad was deleted or unreadable, the function returned a failure that was treated as non-fatal in certain code paths, allowing authentication to succeed without the USB device being verified. A local user can delete their own ~/.pamusb/device.pad to remove the USB device requirement and authenticate without the physical device. This vulnerability is fixed in 0.9.0.",
    "published": "2026-05-27T20:06:15.388Z",
    "modified": "2026-05-27T20:06:15.388Z",
    "type": "cve",
    "title": "pam_usb: OTP pad authentication bypass via missing system pad check and uninitialized RNG buffer",
    "source": "GitHub_M",
    "references": "https://github.com/mcdope/pam_usb/security/advisories/GHSA-vx6f-rrqr-j87c",
    "id": "CVE-2026-47272",
    "bulletinFamily": "",
    "cwe": [
        "CWE-287",
        "CWE-908"
    ],
    "cvelist": null,
    "sourceData": "mcdope pam_usb < 0.9.0",
    "sourceHref": "",
    "cvss": {
        "score": 7.1,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "pam_usb",
    "version": "< 0.9.0",
    "vendor": "mcdope",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}