PT-2026-50783 · Mcdope · Pam Usb

Publicado 2026-06-18 · Atualizado 2026-06-18 · CVE-2026-48982

Mitre

CVSS v3.1

5.8

Média

Vetor base

AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L

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.

Correção

Race Condition

Enumeração de Fraquezas

CWE-362

Identificadores relacionados

CVE-2026-48982

Produtos afetados

Pam Usb

Referências · 3

• https://github.com/mcdope/pam_usb/releases/tag/0.9.2 · Nota
• https://github.com/mcdope/pam_usb/security/advisories/GHSA-hxh6-9574-5vp6 · Nota
• https://nvd.nist.gov/vuln/detail/CVE-2026-48982 · Nota de Segurança