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
2026-08-12T16:25:30.473922Z
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 
{
    "cwe_ids": [
        "CWE-367"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48983.json",
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/mcdope/pam_usb

Affected ranges

Type
GIT
Repo
https://github.com/mcdope/pam_usb
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
d4083e266b7e18e41e58b3392b5856941a3b5b1c
Database specific
Show details 
{
    "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

vanir_signatures_modified 
"2026-08-12T16:25:30Z"
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48983.json"
vanir_signatures 
[
    {
        "signature_version": "v1",
        "source": "https://github.com/mcdope/pam_usb/commit/d4083e266b7e18e41e58b3392b5856941a3b5b1c",
        "digest": {
            "line_hashes": [
                "207168628483260584139415185282640304588"
            ],
            "threshold": 0.9
        },
        "deprecated": false,
        "signature_type": "Line",
        "id": "CVE-2026-48983-efc14bc2",
        "target": {
            "file": "src/version.h"
        }
    }
]