CVE-2026-48982

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-48982
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48982.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-48982
Aliases
  • GHSA-hxh6-9574-5vp6
Published
2026-06-18T19:01:08Z
Modified
2026-08-12T16:25:30Z
Severity
  • 5.8 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L CVSS Calculator
Summary
pam_usb: Missing O_EXCL on pad temp file creation allows concurrent update race
Details

pam_usb provides hardware authentication for Linux using ordinary removable media. In versions prior to 0.9.2, when updating a one-time pad file, a temporary file is created using open() without the O_EXCL flag. Without O_EXCL, the create operation is not atomic: two concurrent processes racing to update the same pad may both succeed in opening the file, with the second write silently overwriting the first. The one-time pad is the core replay-prevention mechanism of pam_usb. A successful race could result in the stored pad value diverging from what either process expected, potentially causing authentication failures or, in a precisely timed attack, creating a window for pad reuse. This issue has been fixed in version 0.9.2.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-362"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48982.json"
}
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 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.9.2"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

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-2026-48982.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "207168628483260584139415185282640304588"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-48982-efc14bc2",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/mcdope/pam_usb/commit/d4083e266b7e18e41e58b3392b5856941a3b5b1c",
        "target": {
            "file": "src/version.h"
        }
    }
]
vanir_signatures_modified 
"2026-08-12T16:25:30Z"