CVE-2026-48983

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Source

https://cve.org/CVERecord?id=CVE-2026-48983

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48983.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-48983

Aliases

GHSA-4j8q-67fq-3xc3

Published

2026-06-18T19:07:56.198Z

Modified

2026-07-08T08:12:35.088474544Z

Severity

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

Summary

pam_usb: TOCTOU race condition in pad directory creation allows symlink substitution

Details

pamusb provides hardware authentication for Linux using ordinary removable media. In versions prior to 0.9.2, a symlink race condition exists in per-device and per-user pad directory creation. pamusb uses a check-then-act pattern: it calls lstat() to test for existence and then calls mkdir() separately to create the directory. A local attacker can win the race between these calls by replacing the target path with a symlink to a directory they control. If successful, one-time pad files may be written to an attacker-controlled location, potentially exposing future pad values before use or disrupting authentication. This issue has been fixed in version 0.9.2.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48983.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-367"
    ]
}

References

Affected packages

Git / github.com/mcdope/pam_usb

Affected ranges

Type

GIT

Repo

https://github.com/mcdope/pam_usb

Events

Introduced

Fixed

d4083e266b7e18e41e58b3392b5856941a3b5b1c

Database specific

{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.9.2"
        }
    ]
}

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

0.9.1

v0.*

v0.7.0

v0.8.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48983.json"