CVE-2026-48064

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Source

https://cve.org/CVERecord?id=CVE-2026-48064

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48064.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-48064

Aliases

GHSA-w38v-cw9r-x9p6

Published

2026-05-27T19:59:53Z

Modified

2026-08-12T16:25:27Z

Severity

8.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator

Summary

pam_usb: PAM_RHOST check skipped when deny_remote=false allows XDMCP authentication bypass

Details

pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.1, when a PAM service is configured with deny_remote=false in pam_usb (commonly done for display managers such as gdm-password or lightdm to bypass process/TTY heuristics for local sessions), the PAM_RHOST check in pusb_do_auth() is also skipped. PAM_RHOST is set by remote daemons (sshd, XDMCP servers) to identify the remote client address. Because the check is gated inside if (opts.deny_remote), a genuine remote XDMCP connection reaches the USB device authentication step instead of being rejected. This vulnerability is fixed in 0.9.1.

Database specific

{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-863"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48064.json"
}

References

Affected packages

Git / github.com/mcdope/pam_usb

Affected ranges

Type

GIT

Repo

https://github.com/mcdope/pam_usb

Events

Introduced

Fixed

e2f30b22cd0715fcde0fc62d6ee3e1ca6370b8a9

Database specific

Show details

{
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "0.9.1"
        }
    ],
    "source":  "AFFECTED_FIELD"
}

Affected versions

0.*

0.5.0

0.7.1

0.7.2

0.7.3

0.8.3

0.8.4

0.8.7

0.9.0

v0.*

v0.7.0

v0.8.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48064.json"

vanir_signatures

[
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "32897324108646938673138056869665931337"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-48064-b792a2ae",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/mcdope/pam_usb/commit/e2f30b22cd0715fcde0fc62d6ee3e1ca6370b8a9",
        "target":  {
            "file":  "src/version.h"
        }
    }
]

vanir_signatures_modified

"2026-08-12T16:25:27Z"